Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (6): 1897-1904.doi: 10.13278/j.cnki.jjuese.20190157

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Analysis of Tectonic Mechanism of Songyuan M5.1 Earthquake on May 18, 2019

Ruan Qingfeng1, Liu Cai1, Liu Junqing2, Zhang Yu2, Zheng Guodong2   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Jilin Earthquake Agency, Changchun 130117, China
  • Received:2019-08-06 Published:2020-12-11
  • Supported by:
    Supported by National Natural Science Foundation of China (41430322)

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Abstract: Based on the digital waveform data of the regional seismic network, we inverted the seismic moment tensor solution for the Songyuan M5.1 earthquake by using the ISOLA method. Also,we inverted the stress field of the focal mechanism of the ML>2.5 events in the aftershock sequence by FMSI method. The study results show that the Songyuan M5.1 earthquake has a moment magnitude of Mw 4.9, centroid depth of 7 km, and double couple components of 91.5%. The azimuth and plunge of P-axes are 76° and 3° respectively, and those of T-axes are 166° and 16° respectively. The reduced stress tensor shows that the azimuth and plunge of σ1 are 88.0° and 0.9°, those of σ2 are 178.2° and 9.6°, and those of σ3 are 352.5° and 80.4° respectively, which agree with the region stress field. We suggest that it is the region stress field that triggered the Songyuan M5.1 earthquake, which occurred on the second Songhuajiang fault near the source region.

Key words: Songyuan M5.1 earthquake, focal mechanism solutions, moment tensor solution, tectonic stress field

CLC Number: 

  • P631.4
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