Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 603-609.doi: 10.13278/j.cnki.jjuese.201602304

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Outdoor Observation Evidence of the Meta-Instability State

Zhang Shuliang1,2, Li Yan2,3, Wang Xia1,2, Li Bin1,2, Lü Fang1,2   

  1. 1. Earthquake Administration of Shanxi Province, Taiyuan 030021, China;
    2. National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan 030025, China;
    3. Linfen Central Seismostation, Earthquake Administration of Shanxi Province, Linfen 041000, Shanxi, China
  • Received:2015-06-10 Published:2016-03-26
  • Supported by:

    Supported by Shanxi Province Programs for Science and Technology (20150313016-2) and Science for Earthquake Resilience (XH13004)

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Abstract:

The similar image of rock rupture process was recorded clearly in laboratory by the broadband tiltmeter of Linfen station before the 2010 Hejin MS4.8 earthquake.In 2009, the observation data from April to July, were based on almost all linear variation; Nonlinear variation deviating linear appeared in August; Data began to drop slowly after the peak reaches in October, and that is a stage of sub-instability; Data appeared quick drop in December and turned flat on Dec.21. 35 days later, the earthquake of MS4.8 occured 89 km away from the observation station. In the stage of quasi-linear (stress accumulation stage of rock rupture test), seismogenic fault and Benioff strain curve accelerated at the same time, indicating that the sub-instability phenomena recorded by VP-type broadband tiltmeter of Linfen station was from the hypocenter. The sub-instability can be proved through outdoor observation data.

Key words: meta-instability, VP-type broadband tiltmeter, outdoor observation, short-term and imminent prediction

CLC Number: 

  • P631.4

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