THE PRELIMINARY STUDY ON THE SEISMOGENIC STRUCTURE OF THE HUTUBI MS6.2 EARTHQUAKE |
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| Authors: | YANG Wen CHENG Jia YAO Qi CUI Ren-sheng LONG Hai-yun HAN Yan-yan |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.China Earthquake Networks Center, Beijing 100045, China;3.Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;4.Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China |
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| Abstract: | Based on the phase report of Xinjiang Seismic Network, the Hutubi MS6.2 earthquake sequence ML ≥ 1.0 was relocated by the HypoDD method. The results show that the aftershocks were distributed along NE and NW direction. The aftershocks were in the depths of 5~15km. In addition, by using the digital waveforms of Xinjiang Seismic Network, the best double-couple focal mechanism of the main shock and some aftershocks of MS ≥ 3.8 were determined by the CAP method. Based on the above studies, the source depth, focal mechanism and aftershock distribution of the Hutubi MS6.2 earthquake were analyzed and the seismogenic structure was discussed. The nodal plane parameters of the best double-couple focal mechanism are strike 144°, dip 26°, rake 118°, and strike 293°, dip 67°, rake 77°, respectively. The moment magnitude MW is about 5.9, with centroid depth of 15.2km. These show that the main shock was a thrust type. Most focal mechanism solutions of the aftershocks were shown as a thrust type, which are similar to the main shock. It is speculated that the possible seismogenic fault of this earthquake is the Huorgosi-Manas-Tugulu Fault. |
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| Keywords: | 2016 Hutubi MS6 2 earthquake seismogenic structure double-difference algorithm focal mechanism Cut-and-Paste method |
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