Accession Number:

AD0736526

Title:

Relative Generation of Seismic Waves to 4000 Kilometers Epicentral Distance

Descriptive Note:

Final rept. 1 Nov 1970-31 Dec 1971

Corporate Author:

GEORGE WASHINGTON UNIV WASHINGTON DC

Personal Author(s):

Report Date:

1971-12-31

Pagination or Media Count:

66.0

Abstract:

Lateral variations of seismic wave absorption in the upper mantle beneath the United States are determined by calculation of seismic Q for Pn wave paths. Departures from the amplitude decay of the Pn wave predicted by cylindrical spreading along the crust-mantle boundary form the basis of the Q estimation. Agreement between the contours of upper mantle Q and other geophysical parameters is also demonstrated in some detail, particularly with teleseismic signal amplitude variations and delay time, heat flow, and the anamolous field intensities induced by geomagnetic storms.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE