INDEPTH Wide-Angle Reflection Observation of P-Wave-to-S-Wave Conversion from Crustal Bright Spots in Tibet
Three-component wide-angle seismic data acquired in southern Tibet during Project INDEPTH show strong P-to-S converted reflections from reflectors that are aligned at a depth of approximately 15 kilometers beneath the northern Yadong-Gulu rift. These converted reflections are locally higher in amplitude than the corresponding P-wave reflections. Modeling of reflection mode conversion as a function of incidence angle indicates that this condition obtains for a reflector that is a solid over fluid interface; it is not typical of a solid-solid interface. The likely candidates for a fluid trapped within the crystalline crust of southern Tibet are granitic magma and water (brine).
Makovsky
Y
Y. Makovsky, S. L. Klemperer, L. Ratschbacher, Department of Geophysics, Stanford University, CA 94305-2215, USA. L. D. Brown, Department of Geological Sciences, Cornell University, Ithaca, NY 14853, USA. Ming Li, Wenjin Zhao, and Fanle Meng, Chinese Academy of Geological Sciences, Baiwanzhuang Road 26, Beijing 100037, China.
Klemperer
SL
Ratschbacher
L
Brown
LD
Li
M
Zhao
W
Meng
F