Accession Number:

ADA094644

Title:

Regional Seismic Wave Propagation

Descriptive Note:

Final rept. 15 Dec 1977-30 Sep 1980

Corporate Author:

RONDOUT ASSOCIATES INC STONE RIDGE NY

Personal Author(s):

Report Date:

1980-11-30

Pagination or Media Count:

96.0

Abstract:

In a review of studies on the seismic phase Lg, we describe its particle motion, dispersion, spectral content, mode of propagation, and magnitude-scale we also tabulate the regional velocity, attenuation, and propagation efficiency for this seismic phase. The characteristics of Lg-wave propagation in the eastern and western United States are compared with those in different regions of the Soviet Union. Possible discriminants such as 1 Lg vs. P amplitudes, 2 LgP amplitude ratios as a function of distance, 3 group velocities of Lg at amplitude maxima, and 4 Lg energy ratios are found, similar to attenuation and group velocity, to be highly dependent on the propagation path. The valid application of these quantities to the problem of earthquake-explosion discrimination will therefore require regional studies more detailed than previously assumed.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE