吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (2): 603-609.doi: 10.13278/j.cnki.jjuese.201602304

• 地球探测与信息技术 • 上一篇    下一篇

亚失稳态野外观测证据

张淑亮1,2, 李艳2,3, 王霞1,2, 李斌1,2, 吕芳1,2   

  1. 1. 山西省地震局, 太原 030021;
    2. 太原大陆裂谷动力学国家野外科学观测研究站, 太原 030025;
    3. 山西省地震局临汾中心地震台, 山西临汾 041000
  • 收稿日期:2015-06-10 发布日期:2016-03-26
  • 作者简介:张淑亮(1963-),女,正研级高级工程师,主要从事地震综合预测与研究工作,E-mail:zzsl_009@163.com
  • 基金资助:

    山西省科技攻关项目(20150313016-2);地震科技星火计划项目(XH13004)

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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摘要：

2010年1月24日,山西省河津市发生了MS 4.8级地震,在此之前,山西临汾地震台VP型宽频带倾斜仪2009年的观测数据清晰地记录到与实验室岩石破裂失稳过程类似的图像:4-7月观测数据以准线性变化为主;8月出现偏离线性的非线性变化;10月达到峰值点之后开始缓慢下降,此阶段即亚失稳阶段;12月出现加速下降;12月21日转平。转平之后35 d距离观测台站89 km处的河津市即发生了MS 4.8级地震。在准线性阶段(岩石破裂实验的应力积累阶段),发震断层及附近的Benioff应变曲线也出现同步加速现象。这表明临汾地震台VP型宽频带倾斜仪所记录的亚失稳态现象是来自震源的信息。实验室观测到的亚失稳现象可在野外观测数据中得以验证。

关键词: 亚失稳态, VP型宽频带倾斜仪, 野外观测, 短临预测

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

中图分类号: 

  • P631.4

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