Accession Number:

AD0747763

Title:

Seismic Shear Waves as a Discriminant between Earthquakes and Underground Nuclear Explosions

Descriptive Note:

Corporate Author:

TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA LAB

Personal Author(s):

Report Date:

1972-07-05

Pagination or Media Count:

28.0

Abstract:

The theoretical amplitude ratio of shear waves to compressional waves is computed using point double-couple representations of earthquakes. These ratios are compared to earthquake data from the LRSM and VELA observatory network. The earthquake data on shear-to-compressional ratios from this network is directly compared to that from NTS underground nuclear explosions. The shear-to-compressional ratio in the teleseismic distance range is found to be significantly greater for earthquakes than explosions, especially in the short- period band. However, use of shear wave data to discriminate between earthquakes and explosions is hampered by a high detection threshold.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE