亚失稳态野外观测证据  

Outdoor Observation Evidence of the Meta-Instability State

作　　者：张淑亮[1,2] 李艳[2,3] 王霞[1,2] 李斌[1,2] 吕芳[1,2] 

机构地区：[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

出　　处：《吉林大学学报（地球科学版）》2016年第2期603-609,共7页Journal of Jilin University：Earth Science Edition

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

摘　　要：2010年1月24日,山西省河津市发生了MS4.8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35d距离观测台站89km处的河津市即发生了MS4.8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。The similar image of rock rupture process was recorded clearly in laboratory by the broadband tiltmeter of Linfen station before the 2010 Hejin MS4.8earthquake.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 MS4.8occured 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 outdoorobservation data.

关 键 词：亚失稳态 VP型宽频带倾斜仪 野外观测 短临预测 

分 类 号：P631.4[天文地球—地质矿产勘探]