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Published on: August 5, 2016
Evidence from Earthquake Data for a Partially Molten Crustal Layer in Southern Tibet
1R. Kind and Xiaohui Yuan, GeoForschungsZentrum Potsdam, 14473 Potsdam, Germany. James Ni, Jianxin Wu, C. Reese, T. Hearn, Department of Physics, New Mexico State University, Las Cruces, NM 88003, USA. Wenjin Zhao, Chinese Academy of Geological Sciences, Beijing, China Lianshe Zhao, Institute for Geophysics, University of Texas at Austin, Austin, TX 78759, USA. E. Sandvol, Department of Geological Sciences, Cornell University, Ithaca, NY 14853, USA. J. Nabelek, College of Oceanography, Oregon State University, Corvalis, OR 97331, USA.
A study of southern Tibet
Area of Science:
- Geophysics
- Seismology
- Tectonics
Background:
- The Tibetan Plateau's crustal structure is complex.
- Understanding its velocity variations is key to seismic activity insights.
Purpose of the Study:
- To investigate the crustal velocity structure beneath southern Tibet.
- To identify variations and their implications for geological processes.
Main Methods:
- Analysis of earthquake data from the INDEPTH-II Passive-Source Experiment.
- Receiver function inversion.
- Rayleigh-wave phase velocity analysis.
- Teleseismic P-waveform radial component modeling.
Main Results:
- A significant south-to-north variation in crustal velocity was observed.
- A mid-crustal low-velocity zone was identified beneath the southern Lhasa block.
- No low-velocity zone was detected beneath the Tethyan Himalaya.
Conclusions:
- The mid-crustal low-velocity zone suggests a partially molten layer in the middle crust.
- This layer is present beneath the northern Yadong-Gulu rift and potentially much of southern Tibet.
- These findings provide crucial insights into the region's ongoing tectonic evolution.
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