Accession Number : AD0803340

Title :   STATISTICS ASSOCIATED WITH THE DETECTION OF BODY AND SURFACE WAVES FROM EARTHQUAKES AND UNDERGROUND DETONATIONS.

Descriptive Note : Technical rept.

Corporate Author : GEOTECH GARLAND TX

Report Date : 09 AUG 1966

Pagination or Media Count : 22

Abstract : A statistical survey of the Long-Range Seismic Measurements Program (LRSM) Seismological Bulletin was made to determine the chances of detecting short-period P, long-period P, long-period S, and long-period surface waves from earthquakes at four different LRSM sites - LC-NM, MN-NV, RK-ON, and DH-NY. The probabilities were tabulated as joint functions of epicentral distance and magnitude, based on hypocenter information supplied by the USC and GS. A similar survey was made of 19 LRSM Shot Reports to determine the frequency with which these phases have been detected from underground detonations, all LRSM stations considered. An attempt was made to compare the earthquake and detonation statistics. The results show that surface waves from earthquakes are identified on LRSM long-period seismograms much more frequencly than body waves from the same events, by a factor of about five. Also, the probability of an earthquake being detected is much more affected by its magnitude than the distance to the recording site. A statistical indication exists that there is a difference between earthquakes and explosions in their propensities to emit body-wave energy in the long-period band. (Author)

Descriptors :   (*SEISMIC WAVES, STATISTICAL ANALYSIS), EARTHQUAKES, UNDERGROUND EXPLOSIONS, DETECTION, PROBABILITY, EPICENTERS, RANGE(DISTANCE), INTENSITY, SEISMOGRAPHS.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE