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Helicopter Electromagnetic and Magnetic Survey Data and Maps, Seco Creek Area, Medina and Uvalade Counties, Texas - Open-File Report 2003-226 (Paperback)
Loot Price: R470
Discovery Miles 4 700
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Helicopter Electromagnetic and Magnetic Survey Data and Maps, Seco Creek Area, Medina and Uvalade Counties, Texas - Open-File Report 2003-226 (Paperback)
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Loot Price R470
Discovery Miles 4 700
Expected to ship within 10 - 15 working days
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A helicopter electromagnetic and magnetic (HEM) survey was
completed of a 209 square kilometer (81 square miles) area of the
central Edwards aquifer. This open-file report is a release of the
airborne geophysical data and a summary of the hydrologic
application. The survey area was centered on the Valdina Farms
sinkhole along the Seco Creek drainage in western Medina County,
Texas. Flight lines were flown north south with three east west tie
lines to aid in leveling the magnetic data. Additional lines were
flown on each side of the Seco and Little Seco Creek drainages. A
five kilometer (4 mile) extension of 15 lines was flown north of
the main survey block centered on Seco Creek. This digital data
release contains the flight line data, grids, and maps of the HEM
survey data. The Edwards aquifer in this area consists of three
hydrologic zones: catchment, recharge, and confined. The Glen Rose
Formation is exposed in the catchment area. The recharge zone is
situated in the Balcones fault zone where the Devils River Group of
the Edwards aquifer has been exposed by normal faults. The magnetic
data is not discussed in depth here, but does have high amplitude
closed anomalies caused by shallow igneous intrusives. The Woodard
Cave Fault that separates the recharge and catchment zones is in
places associated with a weak linear magnetic low. The HEM data has
been processed to produce apparent resistivities for each of the
six EM coil pairs and frequencies. Maps of the apparent resistivity
for the five horizontal coil pairs show that the catchment,
recharge, and confined zones all have numerous linear features that
are likely caused by structures, many of which have not been
mapped. The distribution of high resistivity areas reflects the
lithologic differences within the Trinity and Edwards aquifers.
General
Imprint: |
Bibliogov
|
Country of origin: |
United States |
Release date: |
February 2013 |
First published: |
February 2013 |
Authors: |
Bruce D. Smith
|
Dimensions: |
246 x 189 x 3mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
56 |
ISBN-13: |
978-1-288-74584-5 |
Categories: |
Books >
Social sciences >
Politics & government >
General
|
LSN: |
1-288-74584-2 |
Barcode: |
9781288745845 |
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