|
|
Books > Social sciences > Sociology, social studies > Social issues > Social impact of disasters > General
Earthquakes are potentially the most destructive of all natural
disasters in both loss of life and property damage. Casualties and
structural damage result from intense ground shaking and such
secondary effects as fires, landslides, ground subsidence, and
flooding from dam collapse or tsunamis. While earthquakes in the
United States are commonly associated with the West Coast,
particularly California, 39 states altogether face some degree of
seismic risk. Seventy million people and at least nine metropolitan
areas are susceptible to severe earthquakes. Nevertheless,
California has been the focal point of most earthquake studies due
to its high frequency of events (two thirds of all earthquakes have
occurred in California), large population and extensive property
development. But the high frequency of earthquakes alone does not
warrant the amount of official and scientific attention these
events have received. It is the rare and devastating earthquake
such as the 1906 San Francisco quake and the 1964 Alaska event,
both of which measured more than 8 on the Richter Scale.
Earthquakes of this magnitude could be expected in the United
States, and most likely in California, every 60 to 100 years and
less severe but major earthquakes every 15 to 20 years (Anderson,
et al., 1981). The area currently believed to be at greatest risk
of a massive earthquake is the Los Angeles-San Bernardino region.
An event which could exceed 8 on the Richter Scale has an estimated
annual probability of occurrence of 2 to 5 percent and its
likelihood of occurrence in the next 20 to 30 years is regarded as
-high." This earthquake could kill and injure between 15,000 and
69,000 persons (depending upon time of occurrence) and cause up to
$17 billion in property damage (NSC/FEMA, 1980). Some studies have
placed the property damage estimates as high as $50 billion (U.S.
Department of Commerce, 1969). This report grew out of the City of
Los Angeles Planning Partnership for which the Southern California
Earthquake Preparedness Project (SCEPP) was asked to research and
report on several issues pertaining to earthquake insurance. In the
course of this research, it became obvious to both SCEPP and
SCEPP's Policy Advisory Board that earthquake insurance and its
role in the recovery process was a major policy issue. Thus, the
research effort was expanded to incorporate broader issues and
circulation of the report beyond the Los Angeles Planning
Partnership. The report has five goals which correspond to its
organization: (1) to outline the provisions (coverages, rates,
deductibles, etc.) of earthquake insurance policies currently
available to the major classes of insurance consumers-homeowners,
businesses, local governments and special districts; (2) to
determine the extent to which earthquake insurance is purchased by
these parties and explore the circumstances surrounding purchase or
non-purchase; (3) to review the salient issues in earthquake
insurance from the standpoints of purchasers and providers; (4) to
explore potential Federal roles in resolving these issues and in
providing or promoting earthquake insurance; and finally, (5) to
make reasonable policy recommendations involving both the Federal
Government and other stakeholders in earthquake insurance toward a
more adequate system of coverage.
Prepping A to Z The Series of Prepping Books About How to Be More
Prepared and Live A More Self-Reliant Lifestyle
The first book on the Bhopal disaster, written on site a few weeks
after the accident. "The people knew right away the source of the
poisonous air, although it was incredible and shocking. Thousands
had fled their homes a few months before upon the occasion of a
small discharge of gas and an associated rumor of disaster. Now
they choked and screamed at one another to rise and flee, aiding
each other when they could, the choking and gagging leading the
fully blinded. Some stepped out of their huts at the first whiffs,
strangling, and were too blinded to turn back in, were swept in the
gathering human torrent and often never saw their families,
neighbors and friends again..." "A moving account of a shattering
experience." - Arun Gandhi "Rightly, Al de Grazia highlights the
important role of a Free Press. The Press has had to battle secrecy
and suppression to expose the full extent of the Bhopal tragedy.
Conitnuing now to assail the shocking failures of managers and
officials in India and the USA, we must demand the reform of the
irresponsible liaison between governments and multinational
corporations." - S. B. Kolpe
The original Earthquakes -A Teacher's Package for K-6 (FEMA 159)
was developed as a joint effort of the Federal Emergency Management
Agency (FEMA) and the National Science Teachers Association (NSTA)
under contract with FEMA. NSTA's project team produced an excellent
product. Since its publication in 1988, over 50,000 teachers have
requested copies. This revised version brought members of the
original project team together with a group of teachers who had
used the materials extensively in their classroom and served as
teacher-educators at FEMA's Tremor Troop workshops. About 75% of
the original material remains unchanged: a few activities were
removed and a few added. A major change was the addition of
assessments throughout the units. The examples we provide relate to
life outside the classroom and/or activities similar to those of
scientists. We also added matrices linking activities to the
National Science Education Standards. The Teacher's Package has
five units. Each of the first four units is divided into three
levels: Level 1, for grades K-2; Level 2, for grades 3-4; and Level
3, for grades 5-6. Since classes and individuals vary widely you
may often find the procedures in the other levels helpful for your
students. The last unit has four parts with activities for students
in all grades, K-6. Unit L, Defining an Earthquake, builds on what
students already know about earthquakes to establish a working
definition of the phenomenon. Legends from near and far encourage
children to create their own fanciful explanations, paving the way
for the scientific explanations they will begin to learn in this
unit. Unit I, Why and Where Earthquakes Occur, presents the modern
scientific understanding of the Earth's structure and composition,
and relates this to the cause of earthquakes. Unit II, Physical
Results of Earthquakes, provides greater understanding of the
processes that shape our active Earth. Earthquakes are put in the
context of the large- and small-scale changes that are constantly
at work on the continents as well as the ocean floor. Unit IV,
Measuring Earthquakes, explains earthquakes in terms of wave
movement and introduces students to the far-ranging effects of
earthquakes. Unit V, Earthquake Safety and Survival, focuses on
what to expect during an earthquake; how to cope safely; how to
identify earthquake hazards; and how to reduce, eliminate, or avoid
them.
Recent earthquakes around the world show a pattern of steadily
increasing damages and losses that are due primarily to two
factors: (1) significant growth in earthquake-prone urban areas and
(2) vulnerability of the older building stock, including buildings
constructed within the past 20 years. In the United States,
earthquake risk has grown substantially with development while the
earthquake hazard has remained relatively constant. Understanding
the hazard requires studying earthquake characteristics and locales
in which they occur while understanding the risk requires an
assessment of the potential damage to the built environment and to
the welfare of people - especially in high risk areas. Estimating
the varying degree of earthquake risk throughout the United States
is useful for informed decision-making on mitigation policies,
priorities, strategies, and funding levels in the public and
private sectors. For example, potential losses to new buildings may
be reduced by applying seismic design codes and using specialized
construction techniques. However, decisions to spend money on
either of those solutions require evidence of risk. In the absence
of a nationally accepted criterion and methodology for comparing
seismic risk across regions, a consensus on optimal mitigation
approaches has been difficult to reach. While there is a good
understanding of high risk areas such as Los Angeles, there is also
growing recognition that other regions such as New York City and
Boston have a low earthquake hazard but are still at high risk of
significant damage and loss. This high risk level reflects the
dense concentrations of buildings and infrastructure in these areas
constructed without the benefit of modern seismic design
provisions. In addition, mitigation policies and practices may not
have been adopted because the earthquake risk was not clearly
demonstrated and the value of using mitigation measures in reducing
that risk may not have been understood. This study highlights the
impacts of both high risk and high exposure on losses caused by
earthquakes. It is based on loss estimates generated by
HAZUS(r)-MH, a geographic information system (GIS)-based earthquake
loss estimation tool developed by the Federal Emergency Management
Agency (FEMA) in cooperation with the National Institute of
Building Sciences (NIBS). The HAZUS tool provides a method for
quantifying future earthquake losses. It is national in scope,
uniform in application, and comprehensive in its coverage of the
built environmen
One of the activities authorized by the Dam Safety and Security Act
of 2002 is research to enhance the Nation's ability to assure that
adequate dam safety programs and practices are in place throughout
the United States. The Act of 2002 states that the Director of the
Federal Emergency Management Agency (FEMA), in cooperation with the
National Dam Safety Review Board (Review Board), shall carry out a
program of technical and archival research to develop and support:
improved techniques, historical experience, and equipment for rapid
and effective dam construction, rehabilitation, and inspection;
devices for continued monitoring of the safety of dams; development
and maintenance of information resources systems needed to support
managing the safety of dams; and initiatives to guide the
formulation of effective policy and advance improvements in dam
safety engineering, security, and management. With the funding
authorized by the Congress, the goal of the Review Board and the
Dam Safety Research Work Group (Work Group) is to encourage
research in those areas expected to make significant contributions
to improving the safety and security of dams throughout the United
States. The Work Group (formerly the Research Subcommittee of the
Interagency Committee on Dam Safety) met initially in February
1998. To identify and prioritize research needs, the Subcommittee
sponsored a workshop on Research Needs in Dam Safety in Washington
D.C. in April 1999. Representatives of state and federal agencies,
academia, and private industry attended the workshop. Seventeen
broad area topics related to the research needs of the dam safety
community were identified. To more fully develop the research needs
identified, the Research Subcommittee subsequently sponsored a
series of nine workshops. Each workshop addressed a broad research
topic (listed below) identified in the initial workshop. Experts
attending the workshops included international representatives as
well as representatives of state, federal, and private
organizations within the United States. Impacts of Plants and
Animals on Earthen Dams; Risk Assessment for Dams; Spillway Gates;
Seepage through Embankment Dams; Embankment Dam Failure Analysis;
Hydrologic Issues for Dams; Dam Spillways; Seismic Issues for Dams;
Dam Outlet Works. Based on the research workshops, research topics
have been proposed and pursued. Several topics have progressed to
products of use to the dam safety community, such as technical
manuals and guidelines. For future research, it is the goal of the
Work Group to expand dam safety research to other institutions and
professionals performing research in this field. The proceedings
from the research workshops present a comprehensive and detailed
discussion and analysis of the research topics addressed by the
experts participating in the workshops. The participants at all of
the research workshops are to be commended for their diligent and
highly professional efforts on behalf of the National Dam Safety
Program. The National Dam Safety Program research needs workshop on
Hydrologic Issues for Dams was held on November 14-15, 2001, in
Davis, California. The Department of Homeland Security, Federal
Emergency Management Agency, would like to acknowledge the
contributions of the U.S. Army Corps of Engineers, Hydrologic
Engineering Center, which was responsible for the development of
the technical program, coordination of the workshop, and
development of these workshop proceedings. A complete list of
workshop facilitators, presenters, and participants is included in
the proceedings.
The US Dam Safety community has similar needs and activities to
those of the European (EU) Dam Safety community. There has been an
emphasis in the EU community on investigation of extreme flood
processes and the uncertainties related to these processes. The
purpose of this project was to cooperate with the organizations
involved in these investigations over a three year period. The
purpose of this cooperation was to: 1) coordinate US and EU efforts
and collect information necessary to integrate data and knowledge
with US activities and interests related to embankment overtopping
and failure analysis, 2) Utilize the data obtained by both groups
to improve embankment failure analysis methods, and 3) provide
dissemination of these activities and their results to the US dam
safety community. Dissemination was to be accomplished by: 1)
Conducting a special workshop at a professional society meeting
involving invited speakers from Europe and the United States. This
session was held as a one day workshop at the Annual Conference of
the Association of State Dam Safety Officials 2004 Dam Safety. The
title of the day long workshop was; "Workshop on International
Progress in Dam Breach Evaluation." Ten presentations were included
in the workshop (see appendix for manuscripts). 2) A final report
integrating EU and US research findings and results related to
earthen embankment overtopping failure over the 3-year period would
be developing and reporting in the form of a FEMA/USDA document.
This report is included in the following pages.
Communities face many challenges following a disaster, including
determining where the limited resources for their recovery are to
be expended. After the initial "emergency" phase of a disaster
response is completed, such as the rescue of those in need, the
repair of critical services including water and power, and the
restoration of key governmental functions, a community becomes
focused on its long-term rebuilding. It is important to understand
that there may be multiple funding sources available after a
disaster event, but that resources may not be sufficient to
undertake all the projects a community may ultimately need for full
recovery. A first step for many communities may be to look to
existing local comprehensive plans, capital improvement plans,
hazard mitigation plans, or other similar documents to identify
previously developed project priorities. The process identified in
this Recovery Value Tool builds upon those priorities and provides
a systematic methodology to evaluate recovery projects for the
community. Fundamentally, this tool allows for an evaluation of
priorities based upon the impacts of the recent disaster and the
physical and community needs that have been caused by the event.
Therefore, this process can provide a comprehensive evaluation of
the needs, identify the most effective projects for the resources
available, and allow for a more holistic combination of resources
to accomplish the community's goals. This version of the Long-Term
Community Recovery (LTCR) Recovery Value Tool presents a
standardized methodology for determining the recovery value of
post-disaster reconstruction projects. Prioritizing need,
identifying projects to meet the need and determining which
projects have the highest recovery value are critical steps to
guide a community's long-term recovery from a disaster. The Tool
incorporates best practices developed on a number of successful
pilot recovery planning initiatives throughout the country. The
Tool has been released with expedited review and is intended to
meet the immediate needs of the communities impacted by the 2005
hurricane season. It is expected that revisions will be made to
this tool as a result of refinement of the Long-Term Community
Recovery planning process. The objective of the Recovery Value Tool
is to assist in determining a project's value to the long-term
recovery of a community from a particular disaster. The Recovery
Value Tool will: Define what a Recovery Value is and how it fits
into the planning process; Provide an objective assessment of each
project's recovery value; Assist in determining implementation
priorities; Provide documentation to funding agencies regarding a
project's anticipated long-term impact.
One of the activities authorized by the Dam Safety and Security Act
of 2002 is research to enhance the Nation's ability to assure that
adequate dam safety programs and practices are in place throughout
the United States. The Act of 2002 states that the Director of the
Federal Emergency Management Agency (FEMA), in cooperation with the
National Dam Safety Review Board (Review Board), shall carry out a
program of technical and archival research to develop and support:
improved techniques, historical experience, and equipment for rapid
and effective dam construction, rehabilitation, and inspection;
devices for continued monitoring of the safety of dams; development
and maintenance of information resources systems needed to support
managing the safety of dams; and initiatives to guide the
formulation of effective policy and advance improvements in dam
safety engineering, security, and management. With the funding
authorized by the Congress, the goal of the Review Board and the
Dam Safety Research Work Group (Work Group) is to encourage
research in those areas expected to make significant contributions
to improving the safety and security of dams throughout the United
States. The Work Group (formerly the Research Subcommittee of the
Interagency Committee on Dam Safety) met initially in February
1998. To identify and prioritize research needs, the Subcommittee
sponsored a workshop on Research Needs in Dam Safety in Washington
D.C. in April 1999. Representatives of state and federal agencies,
academia, and private industry attended the workshop. Seventeen
broad area topics related to the research needs of the dam safety
community were identified. To more fully develop the research needs
identified, the Research Subcommittee subsequently sponsored a
series of nine workshops. Each workshop addressed a broad research
topic (listed) identified in the initial workshop. Experts
attending the workshops included international representatives as
well as representatives of state, federal, and private
organizations within the United States: Impacts of Plants and
Animals on Earthen Dams; Risk Assessment for Dams; Spillway Gates;
Seepage through Embankment Dams; Embankment Dam Failure Analysis;
Hydrologic Issues for Dams; Dam Spillways; Seismic Issues for Dams;
Dam Outlet Works. Based on the research workshops, research topics
have been proposed and pursued. Several topics have progressed to
products of use to the dam safety community, such as technical
manuals and guidelines. For future research, it is the goal of the
Work Group to expand dam safety research to other institutions and
professionals performing research in this field. The proceedings
from the research workshops present a comprehensive and detailed
discussion and analysis of the research topics addressed by the
experts participating in the workshops. The participants at all of
the research workshops are to be commended for their diligent and
highly professional efforts on behalf of the National Dam Safety
Program. The National Dam Safety Program research needs workshop on
Outlet Works was held on May 25-27, 2004, in Denver, Colorado. The
Department of Homeland Security, Federal Emergency Management
Agency, would like to acknowledge the contributions of the U.S.
Army Corps of Engineers, Hydrologic Engineering Center, which was
responsible for the development of the technical program,
coordination of the workshop, and development of these workshop
proceedings.
In recent years, tremendous strides have been made by Federal,
State, Tribal, and local governments to educate the public about
natural disasters. Localities are now better able to respond to
disasters, recover from their impact, and mitigate future damage.
However, it remains a fact that in situations of catastrophic
proportions, nothing that technology or preparedness has provided
can prevent the inherent discontinuity in our lives caused by major
disasters. Such events must be responded to through a cooperative
Federal, State, Tribal, and local effort. When a disaster occurs,
it is the responsibility first of the local community and then the
State to respond. Often, their combined efforts are not sufficient
to cope effectively with the direct results of the disaster. This
situation calls for Federal assistance to supplement State, Tribal,
and local efforts. The Robert T. Stafford Disaster Relief and
Emergency Assistance Act, 42 U.S.C. Section 5121 - 5207, authorizes
the President to provide such assistance. Assistance is coordinated
through the Federal Emergency Management Agency (FEMA), a component
of the Department of Homeland Security. This guide explains how
FEMA implements that portion of the law that authorizes Federal
grants for infrastructure recovery through its Public Assistance
(PA) Program. Potential recipients of this funding include State,
Tribal, and local governments and certain types of Private
Nonprofit (PNP) organizations. A fundamental goal of the PA Program
is to ensure that everyone shares a common understanding of the
program policies and procedures. To support this goal, FEMA has
undertaken an effort to provide the State, Tribal, and local
partners with more and better information about the PA Program.
This guide describes the PA Program's basic provisions and
application procedures. The guide may be of interest to elected
leaders, emergency managers, city engineers, public works
directors, financial management personnel, managers of eligible PNP
organizations, and other individuals who have the responsibility
for restoring a community's infrastructure in the wake of a
disaster.
This document is a comprehensive guide to the National Incident
Management System Supporting Technology Evaluation Program (NIMS
STEP). Evaluation activities are sponsored by the National
Preparedness Directorate (NPD), Federal Emergency Management Agency
(FEMA). This guide is designed to provide an orientation to the
evaluation process and policies including vendor application
requirements, product selection methods, evaluation activities, and
post-evaluation review/reporting processes. Homeland Security
Presidential Directive (HSPD)-5 directed the Secretary of Homeland
Security to develop and administer the National Incident Management
System (NIMS). In 2004, the Department of Homeland Security (DHS)
released NIMS to provide a consistent nationwide template to enable
governments and responders to work together effectively and
efficiently to manage incidents and planned events. Although the
incident management framework can be adaptable to any situation,
NIMS provides a standard structure and management concepts that
transcend all incidents, including: Accountability, Common
Terminology, Comprehensive Resource Management, Information and
Intelligence Management, Integrated Communications, Management
Span-of-Control, Modular Organization, Unified Command Structure.
The NIMS provides a framework and sets forth, among others, the
requirement for interoperability and compatibility to enable a
diverse set of public and private organizations to conduct
well-integrated and effective incident management operations.
Systems operating in an incident management environment must be
able to work together and not interfere with one another.
Interoperability and compatibility are achieved through the use of
tools such as common communications and data standards.
Establishing and maintaining a common operating picture and
ensuring accessibility and interoperability are the principal goals
of the Communication and Information Management component of NIMS.
The NIMS STEP supports NIMS implementation by providing an
objective evaluation of supporting technologies - the use and
incorporation of new and existing technologies to improve
efficiency and effectiveness in all aspects of incident management.
The Incident Management Systems Integration (IMSI) Division of NPD
has tasked the NIMS Support Center (NIMS SC) to support and manage
the day-to-day functions of the program.
Hurricane Charley made landfall on Friday, August 13, 2004, at
Mangrove Point, just southwest of Punta Gorda, Florida. On August
19, 2004, the Federal Emergency Management Agency's (FEMA's)
Mitigation Division deployed a Mitigation Assessment Team (MAT) to
Florida to assess damages caused by Hurricane Charley. This report
presents the MAT's observations, conclusions, and recommendations
in response to those field investigations. Several maps included in
our first chapter illustrate the path of the storm, the wind field
estimates, the impact on people and infrastructure, and the depth
of storm surge along the path. The width of the high-wind field was
very narrow even though hurricane force winds affected some portion
of the Florida peninsula from Punta Gorda to Daytona Beach. There
was little storm surge or coastal flooding because of the narrow
size of the storm and the translational speed with which it came
ashore and crossed the state. The hurricane is believed to have
been a design wind event (the wind speeds equaled or exceeded those
delineated in the current version of the Florida Building Code
FBC]) for a narrow area from the point of landfall on the west
coast inland for 120 miles. The design wind speed for Charlotte
County (Punta Gorda) per the FBC is 114 to 130 mph (measured as a
3-second peak gust). The actual measured wind speed near Punta
Gorda was 112 mph (3-second peak gust) and measured speeds in other
parts of the state suggest that Charley was a design wind event.
The storm created a very small area affected by storm surge and
most damage was not caused by flooding from storm surge, waves, or
erosion. Because Hurricane Charley was a design level wind event,
the resultant storm damage provides valuable evidence about the
effectiveness of building codes and design practices as they
ad-dress design guidelines for high winds. For buildings built
prior to the adoption of the current codes, judgments were made
about how the observed damage was reflective of the code to which
the building was constructed, and the quality of construction or
the inspection process that followed construction. Consideration
also was given to the type and use of buildings. Many buildings
that were expected to function for critical/essential services were
severely damaged by the hurricane and lost function for significant
periods of time after the event. The recommendations in this report
are based solely on the observations and conclusions of the MAT,
and are intended to assist the State of Florida, local communities,
businesses, and individ-uals in the reconstruction process and to
help reduce damage and impact from future natural events similar to
Hurricane Charley. The general recommendations presented in Section
8.1 relate to policies and education/outreach that are needed to
ensure that designers, contractors, and building officials
understand the requirements for disaster resistance construction in
hurricane-prone regions.
On August 24, 1992, Hurricane Andrew struck southern Dade County,
Florida, generating high winds and rain over a vast area of the
county. Although the storm produced high winds and high storm
surge, the effects of the storm surge and wave action were limited
to a relatively small area of the coastal floodplain. It was
evident from the extensive damage caused by wind, however, that
wind speeds are significant. In September 1992, the Federal
Emergency Management Agency's (FEMA's) Federal Insurance
Administration (FIA), at the request of the FEMA Disaster Field
Office Staff, assembled a Building Performance Assessment Team. The
task of the team was to survey the performance of residential
buildings in the storm's path and to provide findings and
recommendations to both the Interagency Hazard Mitigation Team and
the Dade County Building Code Task Force. The basis for performing
the survey is that better performance of building systems can be
expected when causes of observed failures are corrected using
recognized standards of design and construction. The assessment
team developed recommendations for reducing future hurricane damage
such as that resulting from Hurricane Andrew. Recommendations
included areas of concern such as building materials, construction
techniques, code compliance, quality of construction, plan review,
inspection, and reconstruction/retrofit efforts. The
recommendations presented in this report may also have application
in other communities in Florida. This report presents the team's
observations of the successes and failures of buildings in
withstanding the effects of Hurricane Andrew, comments on building
failure modes, and provides recommendations for improvements
intended to enhance the performance of buildings in future
hurricanes.
Earthquakes are a serious threat to safety in hotel and motel
buildings and pose a significant potential liability to owners and
operators. Hotel and motel buildings in 39 states are vulnerable to
earthquake damage. Unsafe existing buildings expose hotel and motel
building owners, operators, and guests to the following risks:
Death and injury to guests, visitors, and staff; Damage to or
collapse of buildings; Damage to and loss of furnishings,
equipment, and other building contents; and Disruption of
hospitality functions and building operations. The greatest
earthquake risk is associated with existing hotel and motel
buildings that were designed and constructed before the use of
modern building codes. For many parts of the United States, this
includes buildings built as recently as the early 1990s. Although
vulnerable hotel and motel buildings should be replaced with safe,
new construction or rehabilitated to correct deficiencies, for many
building owners, new construction is limited, at times severely, by
budgetary constraints, and seismic rehabilitation is expensive and
disruptive. However, incremental seismic rehabilitation, an
innovative approach that phases in a series of discrete
rehabilitation actions over a period of several years, is an
effective, affordable, and non-disruptive strategy for responsible
mitigation action that can be integrated efficiently into ongoing
facility maintenance and capital improvement operations to minimize
cost and disruption. This manual and its companion documents are
the products of a Federal Emergency Management Agency (FEMA)
project to develop the concept of incremental seismic
rehabilitation-that is, building modifications that reduce seismic
risk by improving seismic performance and that are implemented over
an extended period, often in conjunction with other repair,
maintenance, or capital improvement activities. It provides
operators of hotels and motels and their owners, be they Real
Estate Investment Trusts (REITs), pension funds, partnerships,
individuals, or other forms of ownership, with the information
necessary to assess the seismic vulnerability of their buildings
and to implement a program of incremental seismic rehabilitation
for those buildings.
The Nation has made measurable strides toward improving
preparedness for the full range of hazards at all levels of
government and across all segments of society. National
preparedness has improved not only for the countless threats posed
by those who wish to bring harm to the American homeland but also
for the many natural and technological hazards that face the
Nation's communities. Presidential Policy Directive 8: National
Preparedness (PPD-8) describes the Nation's approach to preparing
for the threats and hazards that pose the greatest risk to the
security of the United States. The Directive requires a National
Preparedness Report (NPR), an annual report summarizing the
progress made toward building, sustaining, and delivering the 31
core capabilities described in the National Preparedness Goal (the
Goal). As the NPR coordinator, the U.S. Department of Homeland
Security's (DHS's) Federal Emergency Management Agency (FEMA)
worked with the full range of whole community partners-including
all levels of government, private and nonprofit sectors,
faith-based organizations, communities, and individuals-to develop
the NPR. Specifically, FEMA collaborated with federal interagency
partners to identify quantitative and qualitative performance and
assessment data for each of the 31 core capabilities. In addition,
FEMA integrated data from the 2011 State Preparedness Reports
(SPRs), statewide self-assessments of core capability levels
submitted by all 56 U.S. states and territories through a
standardized survey. Finally, FEMA conducted research to identify
recent, independent evaluations, surveys, and other supporting data
related to core capabilities. FEMA synthesized, reviewed, and
analyzed all of these data sources in order to derive key findings
that offer insight on critical issues in preparedness, including
areas where the Nation has made progress and where areas of
improvement remain. During the development of specific core
capability key findings, eight broader trends in national
preparedness emerged. As shown below, these overarching key
findings synthesize information from across multiple core
capabilities and mission areas and reflect national-level results
on preparedness progress and gaps. With the September 2011 release
of the Goal, the Nation is transitioning to a new set of core
capabilities. As a result, whole community partners are updating
their efforts to collect, analyze, and report preparedness progress
according to the Goal's core capabilities and preliminary targets.
The 2012 NPR therefore relies on a range of existing assessment
approaches and associated quantitative and qualitative data to
present the Nation's preparedness progress and to report key
findings. Assessment processes, methodologies, and data will evolve
in future years to align more directly with the Goal and its
capabilities. Efforts are already underway to refine the Goal's
capabilities and preliminary targets; future efforts will focus on
developing agreed-upon measures and assessment methodologies that
will guide the annual development of the NPR.
A considerable number of buildings in the existing building stock
of the United States present a risk of poor performance in
earthquakes because there was no seismic design code available or
required when they were constructed, because the seismic design
code used was immature and had flaws, or because original
construction quality or environmental deterioration has compromised
the original design. The practice of improving the seismic
performance of existing buildings-known variously as seismic
rehabilitation, seismic retrofitting, or seismic
strengthening-began in the U.S. in California in the 1940s
following the Garrison Act in 1939. This Act required seismic
evaluations for pre-1933 school buildings. Substandard buildings
were required to be retrofit or abandoned by 1975. Many school
buildings were improved by strengthening, particularly in the late
1960s and early 1970s as the deadline approached. Local efforts to
mitigate the risks from unreinforced masonry buildings (URMs) also
began in this time period. In 1984, the Federal Emergency
Management Agency (FEMA) began its program to encourage the
reduction of seismic hazards posed by existing older buildings
throughout the country. Recognizing that building rehabilitation
design is far more constrained than new building design and that
special techniques are needed to insert new lateral elements, tie
them to the existing structure, and generally develop complete
seismic load paths, a document was published for this purpose in
1992. FEMA 172, NEHRP Handbook of Techniques for the Seismic
Rehabilitation of Existing Buildings (FEMA, 1992b), was intended to
identify and describe generally accepted rehabilitation techniques.
The art and science of seismic rehabilitation has grown
tremendously since that time with federal, state, and local
government programs to upgrade public buildings, with local
ordinances that mandate rehabilitation of certain building types,
and with a growing concern among private owners about the seismic
performance of their buildings. In addition, following the demand
for better understanding of performance of older buildings and the
need for more efficient and less disruptive methods to upgrade,
laboratory research on the subject has exploded worldwide,
particularly since the nonlinear methods proposed for FEMA 273
became developed. The large volume of rehabilitation work and
research now completed has resulted in considerable refinement of
early techniques and development of many new techniques, some
confined to the research lab and some widely used in industry. Like
FEMA 172, this document describes the techniques currently judged
to be most commonly used or potentially to be most useful.
Furthermore, it has been formatted to take advantage of the ongoing
use of typical building types in FEMA documents concerning existing
buildings, and to facilitate the addition of techniques in the
future. The primary purpose of this document is to provide a
selected compilation of seismic rehabilitation techniques that are
practical and effective. The descriptions of techniques include
detailing and constructability tips that might not be otherwise
available to engineering offices or individual structural engineers
who have limited experience in seismic rehabilitation of existing
buildings. A secondary purpose is to provide guidance on which
techniques are commonly used to mitigate specific seismic
deficiencies in various model building types. The goals of the
document are to: Describe rehabilitation techniques commonly used
for various model building types, Incorporate relevant research
results, Discuss associated details and construction issues,
Provide suggestions to engineers on the use of new products and
techniques.
|
|