Accession Number:

ADA045096

Title:

Teleseismic P-Wave Amplitudes and Spectra at NTS and at the Shoal Site as Compared to those Observed in Eastern North America

Descriptive Note:

Preliminary technical rept.

Corporate Author:

TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER

Report Date:

1977-09-02

Pagination or Media Count:

44.0

Abstract:

Three Special Data Collection System SDCS stations were deployed at NTS to Measure magnitude residuals and spectral differences relative to two Eastern United States EUS stations in order to determine the degree of anelastic attenuation under NTS. At the NTS station located on the Climax stock OB2NV, the average teleseismic body-wave magnitude is .13 magnitude units m. u. lower than at HNME and .19 m.u. lower than at RKON. The magnitudes at the two Pahute Mesa sites average .25 m.u. higher than at OB2NV, but calculations show that most of the difference can be attributed to site amplification by low velocity volcanics under Pahute Mesa. At all NTS sites the high frequency content of P-waves is less than at RKON the difference is statistically significant for two of the three NTS stations, and marginally significant at the third. Measurements at the site of the SHOAL explosion yield similar figures, showing lower high frequency content and lower magnitudes of P-waves relative to EUS. The above results are indicative of anelastic losses of body-waves traversing the mantle under both test sites.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE