Accession Number:

AD0784837

Title:

Long-Period Seismological Research Program

Descriptive Note:

Annual rept. 15 Mar 1971-30 Apr 1974

Corporate Author:

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY

Personal Author(s):

Report Date:

1974-06-14

Pagination or Media Count:

25.0

Abstract:

A technique for studying the focal mechanisms of small magnitude events at teleseismic distances was developed. By comparing observed amplitudes of long-period Rayleigh and Love waves with radiation patterns of focal mechanisms consistent with the previously determined tectonic regime of a certain region, it is possible to discriminate between different types of mechanisms on the basis of signals received at a very limited number of stations. The detection capabilities of the VLP station were evaluated using the special listing of events during the International Seismic Month. Surface waves were observed for 90 of the reported events of m sub b 4.6 or greater. Half of the unobserved events were due to masking by the coda of earlier larger events. For 10 of the events observed at deep stations, only Love waves were observed.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE