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