Evidence from Earthquake Data for a Partially Molten Crustal Layer in Southern Tibet
1996; American Association for the Advancement of Science; Volume: 274; Issue: 5293 Linguagem: Inglês
10.1126/science.274.5293.1692
ISSN1095-9203
AutoresR. Kind, James Ni, Wenjin Zhao, Jianxin Wu, Xiaohui Yuan, Lian‐She Zhao, Eric Sandvol, C. C. Reese, J. Nábělek, Thomas M. Hearn,
Tópico(s)Geological and Geochemical Analysis
ResumoEarthquake data collected by the INDEPTH-II Passive-Source Experiment show that there is a substantial south to north variation in the velocity structure of the crust beneath southern Tibet. North of the Zangbo suture, beneath the southern Lhasa block, a midcrustal low-velocity zone is revealed by inversion of receiver functions, Rayleigh-wave phase velocities, and modeling of the radial component of teleseismic P-waveforms. Conversely, to the south beneath the Tethyan Himalaya, no low-velocity zone was observed. The presence of the midcrustal low-velocity zone in the north implies that a partially molten layer is in the middle crust beneath the northern Yadong-Gulu rift and possibly much of southern Tibet.
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