Accession Number:

ADA164733

Title:

High Frequency P Wave Attenuation and Degradation of Detection Capability by Large Earthquakes.

Descriptive Note:

Semiannual technical rept. no. 1, Dec 84-Jun 85,

Corporate Author:

SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA

Personal Author(s):

Report Date:

1985-09-05

Pagination or Media Count:

64.0

Abstract:

This report describes two distinct seismological studies. The first is High Frequency P Wave Attenuation Along Five Teleseismic Paths from Central Asia. P Wave spectra from E. Kazakhstan explosions recorded at five arrays are computed for all five paths using an absorption band model. The Q exhibits strong frequency dependence in the band from 0.5 to 3 Hz, and is nearly the same for all five paths. The second study is, An Investigation of the Degradation of Teleseismic Detection Capability Caused by Large Earthquakes. A ten year global seismicity bulletin is searched to determine the extent to which large earthquakes inhibit the detection of small earthquakes occurring a short time thereafter. Significant degradation of the detection capability of the 115 station global network contributing to the bulletin is seen for periods up to an hour for earthquakes of M sub b 5.8 and larger.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE