Relative Generation of Seismic Waves to 4000 Kilometers Epicentral Distance
Final rept. 1 Nov 1970-31 Dec 1971
GEORGE WASHINGTON UNIV WASHINGTON DC
Pagination or Media Count:
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.
- Seismic Detection and Detectors