河津4.8级地震前山西临汾台倾斜前驱波特征分析*
李 艳1,2,高振强2,3,程冬焱2,4,张仰辉1,2,李 军1,2

(1.山西省地震局 临汾中心地震台,山西 临汾 041000; 2.太原大陆裂谷动力学国家野外科学观测研究站,山西 太原 030025; 3.山西省地震局 夏县中心地震台,山西 夏县 044400; 4.山西省地震局,山西 太原 030021)

河津4.8级地震; 倾斜仪; 前驱波; 慢粘滑; 短临异常

Analysis on Characteristics of Precursor Wave Recorded by Tiltmeter at Linfen Station in Shanxi before Hejin M4.8 Earthquake
LI Yan1, 2, GAO Zhen-qiang2, 3, CHENG Dong-yan2, 4,ZHANG Yang-hui1,2,LI Jun1,2

(1.Linfen Central Seismological Station, Earthquake Administration of Shanxi Province, Linfen 041000, Shanxi, China)(2.National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan 030025, Shanxi, China)(3.Xiaxian Central Seismological Station, Earthquake Administration of Shanxi Province, Xiaxian 044400, Shanxi, China)(4.Earthquake Administration of Shanxi Province, Taiyuan 030021, Shanxi, China)

Hejin M4.8 earthquake; tiltmeter; precursor wave; slow stick-slip; short impending anomaly

备注

采用临汾台SSQ-2I型石英摆和VP型宽带垂直摆倾斜仪观测资料,运用原始形态曲线方法,对2010年1月24日山西河津4.8级地震前观测曲线进行分析。结果 表明:在震前两种观测手段都记录到明显的前驱波,其形态特征与岩石力学中的粘滑事件非常相似,应是此次地震前显著的短临异常信息,同时给出了产生慢粘滑现象的机理解释。

Using the observation data recorded by SSO-2I quartz horizontal pendulum and VP wild band vertical pendulum tiltmeter, we analyzed the observation curves before Hejin M4.8 earthquake in Shanxi on Jan.24, 2010 by the original shape curve method. The result showed that there were obvious precursor wave before Hejin M4.8 earthquake on the observation curves recorded by two observational means. The morphological characteristics of precursor wave were similar with the stick-slip of the rock mechanics, which may was the short impending anomaly information of the Hejin M4.8 earthquake. We also gave the mechanism explanation of the slow stick slip.