Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 571-583.doi: 10.13278/j.cnki.jjuese.20200032

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Sub-Instability Phenomena in Various Geophysical Fields Observation Data

Zhang Shuliang1,2, Wang Xia1,2, Guo Wenfeng1,2, Chen Hui1,2, Li Huiling1,2   

  1. 1. Shanxi Earthquake Agency, Taiyuan 030021, China;
    2. National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan 030025, China
  • Received:2020-02-18 Published:2021-04-06
  • Supported by:
    Supported by the Key Scientific and Technological Projects of Shanxi Earthquake Agency (SBK-1936) and the Key R&D Projects of Shanxi Province (201903D321013)

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Abstract: Before the M4.8 earthquake on January 24, 2010 in Hejin,Shanxi, the broadband inclinometer at the Linfen seismic station recorded the images that are similar to the sub-instability process of rock fracture, and a number of quasi-synchronous short-term and imminent anomalies were also captured in the laboratory in the epicenter and nearby areas. In this paper, the change characteristics of different geophysical fields observation data before the Hejin M4.8 earthquake and the changes in different stages before stick-slip instability of the seismogenic fault are discussed as follows:1) The sub-instability phenomenon recorded before the earthquake is not a single point or single measurement event but multi-points and multi-physical fields characteristics; 2) The occurrence time of these anomalies is basically synchronous with the time of the sub-instability events recorded by the Linfen broadband inclinometer, and their morphology is mainly characterized by large sudden changes, mostly concentrated in the period of about 45 days before the earthquake within 100 km from the epicenter, and with time passed, they become frequent from the periphery to the epicenter area; 3) Before the Hejin M4.8 earthquake, not only were similar sub-instability phenomena recorded in various geophysical field observation data, but also some small events related to pre-slip were captured by some precursory observation instruments before the instability of the seismogenic fault 1-6 d before the earthquake; 4) The sub-instability phenomenon recorded by the Linfen broadband tilt-meter before the Hejin M4.8 earthquake, and the amount of quasi-synchronous short-term and imminent anomalies in the epicenter and nearby areas occurred when the regional stress in the source and nearby areas increased and the medium characteristics changed; 5) The various geophysical field anomalies before the Hejin M4.8 earthquake showed the coordination of migration and concentration from the periphery to the epicenter along the direction of the seismogenic fault over time, which should be related to the Hejin earthquake.

Key words: Hejin M4.8 earthquake, geophysical fields, meta-instability, regional stress

CLC Number: 

  • P315.7
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[1] Zhang Shuliang, Li Yan, Wang Xia, Li Bin, Lü Fang. Outdoor Observation Evidence of the Meta-Instability State [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(2): 603-609.
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