Analysis of Data from Six Portable Strainmeters in Southern Nevada

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Abstract:

The report covers an analysis of secular strains over an annual cycle at six portable strain sites in southern Nevada as well as a study of the strain characteristics of signals from significant events recorded in the time interval 23 January 1970 through 31 July 1971. Measurements of quasi-static strains support the hypothesis that dynamic loading by the seismic waves from explosions and earthquakes trigger a local release of tectonic strain a strain step. Furthermore, trends in the direction of strain steps appear to be related to regional tectonic strain. On the other hand, residual changes in strain of the order of 0.0001 mm over an annual cycle do not fit any pattern that would suggest a long-term trend in the regional strain field, but appear to be peculiar to individual sites, or at most to subregions of the area covered by the six sites. Earthquake coupling factors among the six sites show nearly the same relative values as obtained from measurements of tidal coupling.

Author(s):
Shopland, Robert C.
Author Organization(s):
TELEDYNE GEOTECH GARLAND TX
Descriptive Note:
Technical rept.
Pagination:
0091

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-71-20
Contract/Grant Number(s):
F33657-70-C-0646, ARPA ORDER-624
Project Number(s):
VT-0703, ARPA-8F10
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_1_Force Support; JCA_6.3_Net Management; JCA_1.2_Force Preparation; JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2.1_Training; JCA_1.2.5_Lessons Learned; JCA_3.2.1_Kinetic Means
Modernization Areas:
Microelectronics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*SEISMOLOGICAL STATIONS, *UNDERGROUND EXPLOSIONS, CORRELATION TECHNIQUES, DETECTION, EARTHQUAKES, INSTALLATION, INTENSITY, MATHEMATICAL PREDICTION, NEVADA, NUCLEAR EXPLOSIONS, SEISMOMETERS, STRAIN(MECHANICS), STRUCTURAL GEOLOGY, UNDERGROUND STRUCTURES
Field(s)/Group(s):
Seismology, Seismic Detection and Detectors
Keyword(s):
GROUND MOTION, VELA UNIFORM, CYATHUS SHOT
Report Date:
1971 Oct 31