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Merifield, P. M.

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& (S e0 CALIFORNIA EARTH SCIENCE CORPORATION
1318 SECOND STREET, SUITE 27 SANTA MONICA, CALIFORNIA 90401 ' TELEPHONE 395-4528, AREA CODE 213 h Pl 0o t.'
May 6, 1974e 0 aA
ay 6, 1974 ad a ble under NASA sponsorthip H0
in the interest of early and wide dis- = c
semination of Earth Resources Survey "PqN
MONTHLY PROGRESS REPORT NO. 11 rogram information and without liability 0 O
April 1974 tor any use made thereot." • ==,April 1974 tm W
Fault Tectonics and Earthquake Hazards in the Peninsular o a:W
Ranges, Southern California, EREP Investigation 463 0 Ul)
NASA, Ames Research Center tv r-
Mail Code 241-1 m 0
Moffett Field, CA 94035 Z* amZ
t H H,
Attention: Mr. Gabriel Fox oCn W W
Contracting Officer H. It
Gentlemen: e
California Earth Science Corporation (CalESCO) is pleased to submit its llth r " W
Monthly Progress Report on the application of Skylab imagery to analysis of O,=
fault tectonics and earthquake hazards in the Peninsular Ranges, southern
California under NASA Contract No. NAS 2-7698.
Summary Outlook
The principal plans for the immediate future are to continue analysis of image
from SL1/SL2 and SL3. The milestone plan provides a time-oreinted schedule of
the entire effort to be performed. C tU
Significant Progress
1. The abstract of a paper presenting the results of the research to date was
submitted and accepted for presentation at "The First International Conference
on the New Basement Tectonics," Salt Lake City, June 3-7, 1974.
2. A test was prepared and given to 35 students in a field geoog class at
UCLA to test their ability to "see" faults and other geologic and linear
features on normal and pseudocolor transformations of a satellite image.
The results are being analyzed.
3. Airphoto and field work were completed on a prominent northeast-trending
Skylab linear in the San Ysidro Valley area in the Peninsular Ranges; this
feature is a previously unmapped fault approximately 10 miles long in
https://ntrs.nasa.gov/search.jsp?R=19740017733 2020-03-23T08:10:07+00:00Z
Monthly Progress Report No. 11
May 6, 1974
Page Two
basement terrane. Airphoto analysis of a similar appearing Skylab linear
in the Thing Valley area of the Peninsular Ranges was initiated. Field
evidence of faulting along the Skylab linear was discovered at the southeast
end of Thing Valley.
4. A systematic program of measuring shear zones exposed in road cuts in the
Peninsular Ranges was initiated. The shear directions measured will be
compared with the directions of linear features observed on Skylab images
of the region.
5. Analysis of SL3 S190B photos of the eastern Peninsular Ranges was continued.
6. From April 2 to April 5 field work was conducted in the El Centro-Mexicali
area in an attempt to trace the San Jacinto fault as suggested by the SL2
image northward of its known location in Mexico and into the U.S. The
geothermal steam field at Cerro Prieto was found to lie on the linear in
the SL2 image. Attempts to find evidence for the fault north of the border
by examining exposures of Lake Cahuilla beds along the New River were
unsuccessful. Further work on this project is being postponed at least
until other promising areas in the Peninsular Ranges have been investigated.
Expected Accomplishments, Current Month
1. The results of the pseudocolor test at UCLA will be analyzed.
2. Field work and airphoto analysis of the Thing Valley linear will be continued.
3. Additional S0192 data will be ordered.
Travel Summary and Plans
Field checks of faults imaged in SLl/SL2 and SL3 will continue during May.
Very truly yours,
CALIFORNIA EARTH SCIENCE CORPORATION
Paul M. Merifield, Ph.D.
Principal Investigator
cc: ~4Ptional Aeronautics and Space Administration
Scientific and Technical Information Facility
Code KS
Washington, D.C. 20546
Mr. John W. Tremor
NASA, Ames Research Center
Moffett Field, CA 94035
CALIFORNIA EARTH SCIENCE CORPORATION


Fault tectonics and earthquake hazards in the Peninsular Ranges, southern California

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