Tsunamis are primarily caused by earthquakes. Under favourable
geological conditions, when a large earthquake occurs below the sea
bed and the resultant rupture causes a vertical displacement of the
ocean bed, the entire column of water above it is displaced,
causing a tsunami. In the ocean, tsunamis do not reach great
heights but can travel at velocities of up to 1000 km/hour. As a
tsunami reaches shallow sea depths, there is a decrease in its
velocity and an increase in its height. Tsunamis are known to have
reached heights of several tens of meters and inundate several
kilometres inland from the shore. Tsunamis can also be caused by
displacement of substantial amounts of water by landslides,
volcanic eruptions, glacier calving and rarely by meteorite impacts
and nuclear tests in the ocean.
In this SpringerBrief, the causes of tsunamis, their intensity and
magnitude scales, global distribution and a list of major tsunamis
are provided. The three great tsunamis of 1755, 2004 and 2011are
presented in detail. The 1755 tsunami caused by the Lisbon
earthquake, now estimated to range from Mw 8.5 to 9.0, was the most
damaging tsunami ever in the Atlantic ocean. It claimed an
estimated 100,000 human lives and caused wide-spread damage. The
2004 Sumatra Andaman Mw 9.1 earthquake and the resultant tsunami
were the deadliest ever to hit the globe, claiming over 230,000
human lives and causing wide-spread financial losses in several
south and south-east Asian countries. The 2011 Mw 9.0 Tohoku-Oki
earthquake and the resultant tsunami were a surprise to the
seismologists in Japan and around the globe. The height of the
tsunami far exceeded the estimated heights. It claimed about 20,000
human lives. The tsunami also caused nuclear accidents. This
earthquake has given rise to a global debate on how to estimate the
maximum size of an earthquake in a given region and the safety of
nuclear power plants in coastal regions. This Brief also includes a
description of key components of tsunami warning centres, progress
in deploying tsunami watch and warning facilities globally, tsunami
advisories and their communication, and the way forward.
General
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