Accession Number : ADA332812

Title :   Uppermost Mantle Structure in the Middle East, Central Asia, Lake Baikal, and Far East from Pn Tomography and Sn Attenuation

Descriptive Note : Final rept. 1 Jul 94-30 Jun 97

Corporate Author : NEW MEXICO STATE UNIV LAS CRUCES DEPT OF PHYSICS

Personal Author(s) : Hearn, Thomas ; Ni, James ; Rapine, Richard ; Reese, Christopher

PDF Url : ADA332812

Report Date : NOV 1997

Pagination or Media Count : 36

Abstract : We have studied the propagation efficiencies of the Sn and Lg phases throughout China and produced summary maps. In addition, estimates of coda Q, Q for the Pn phase, and Q for the Lg phase for Tibet have been made. Sn has difficulty propagating across extended terrains in eastern China, the northern Tibetan plateau, and Mongolia. This makes it a difficult phase to use for nuclear monitoring purposes. Analysis of the Pn and Lg Q for northern Tibet show that partial melt both in the uppermost mantle and middle crust quickly attenuate these phases. Lg does propagate well over most of the rest of China, especially when it does not traverse major changes in crustal structure.

Descriptors :   *SEISMIC DATA, TERRAIN, WAVE PROPAGATION, EARTH CRUST, ATTENUATION, COMPUTERIZED TOMOGRAPHY, CHINA, EARTH MANTLE, SOUTH ASIA.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE