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ISSN  2096-3955

CN  10-1502/P

Citation: YuLan Li, BaoShan Wang, RiZheng He, HongWei Zheng, JiangYong Yan, Yao Li, 2018: Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau, Earth and Planetary Physics, 2, 406-419. doi: 10.26464/epp2018038

2018, 2(5): 406-419. doi: 10.26464/epp2018038


Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau


Key Laboratory of Earthquake Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China


Key Laboratory of Geodynamics of the Department of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, China


Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Corresponding author: HongWei Zheng,

Received Date: 2018-06-21
Web Publishing Date: 2018-09-01

The medium-small earthquakes that occurred in the middle part of Tibetan Plateau (32°N–36°N, 90°E–93°E) from August 2016 to June 2017 were relocated using the absolute earthquake location method Hypo2000. Compared to the reports of Chinese Seismological Networks, our relocation results are more clustered on the whole, the horizontal location differences exceed 10 km, and the focal depths are concentrated in 0–8 km, which indicates that the upper crust inside the Tibetan Plateau is tectonically active. In June 2017 altogether eight earthquakes above magnitude 3.0 took place; their relocated epicenters are concentrated around Gêladaindong. The relocation results of M<3.0 small earthquakes also showed obvious differences. Therefore, we used the CAP method to invert for the focal mechanisms of theM ≥3.0 earthquakes; results generally tally with the surface geological structures, indicating that the Tibetan Plateau is still under the strong compressional force from the India Plate. Among them the eight earthquakes that occurred near Gêladaindong in June 2017 are all of normal fault type or with some strike-slip at the same time; based on previous research results we conjecture that these events are intense shallow crust responses to deep crust-mantle activities.

Key words: relocation; focal mechanism solution; compression; Gêladaindong; ground surface response

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Fine relocation, mechanism, and tectonic indications of middle-small earthquakes in the Central Tibetan Plateau

YuLan Li, BaoShan Wang, RiZheng He, HongWei Zheng, JiangYong Yan, Yao Li