中国及邻区7.0级以上地震形变特征分析  

About analysis of deformation characteristics for M ≥ 7.0 earthquakes in China and its adjacent region

作　　者：巫继兰 冯建琴 洛旦巴珠 多布拉 沈晓松 董甲弟 

机构地区：[1]昆明基准地震台,中国云南650204 [2]贵阳基准地震台,中国贵州550018 [3]Taiyuan Seismic Station

出　　处：《地震地磁观测与研究》2015年第6期87-91,共5页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局监测;预报;科研三结合课题(152601)

摘　　要：对拉萨地震台2008—2015年水平摆观测资料进行研究,结果发现,在中国发生的5次7.0级地震及周边发生的1次8.1级地震前,日均值表现出反年变现象,背景值发生反向改变,五日均值均方差出现超过正常观测值2倍中误差现象,体应变短临异常特征比较明显,主要体现在速率的加速转向和发震前后的阶跃变化。The observations of horizontal pendulum at Lhasa Seismic Station from 2008 to 2015 are studied. The results show that, before five M 7 earthquakes in China and one M 8.1 earthquake in the vicinity of China, the average daily values show the anti year variation and the background values are changed. And the variance of five day average value becomes more than 2 times of normal error. It is an obvious short impending anomaly of body strain, mainly showing accelerated steering of ratio and step change before and after the earthquake.

关 键 词：背景值 中误差 短临异常 转向 阶跃变化 

分 类 号：P315.725[天文地球—地震学]