亚失稳态野外观测证据

doi:10.13278/j.cnki.jjuese.201602304

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

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. 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 Shuliang^1,2, Li Yan^2,3, Wang Xia^1,2, Li Bin^1,2, Lü Fang^1,2

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)

摘要/Abstract

摘要：

2010年1月24日,山西省河津市发生了M_S 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M_S 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 M_S4.8 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 M_S4.8 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

张淑亮, 李艳, 王霞, 李斌, 吕芳. 亚失稳态野外观测证据[J]. 吉林大学学报(地球科学版), 2016, 46(2): 603-609.

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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亚失稳态野外观测证据

Outdoor Observation Evidence of the Meta-Instability State

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