日本7级以上双震前泰安台伸缩仪固体潮畸变  

EARTH TIDE DISTORTION RECORDED BY TENSOMETER AT TAIAN SEISMOSTATION BEFORE STRONG DOUBLE EARTHQUAKES IN JAPAN

作　　者：王梅[1] 牛安福[2] 刘希强[3] 李峰[3] 

机构地区：[1]中国科学技术大学,合肥230029 [2]中国地震局地震预测研究所,北京100036 [3]山东省地震局,济南250014

出　　处：《大地测量与地球动力学》2006年第4期69-75,共7页Journal of Geodesy and Geodynamics

基　　金："十五"国家科技攻关项目(2004BA601B-03-02);山东省地震局合同制项目

摘　　要：山东省泰安台SS-Y伸缩仪自1998年2月运行以来,EW分量仅出现了两次固体潮畸变变化,分别对应发生在日本的2003年9月26日8.0、7.1级双震以及2004年9月5日7.2、7.4级双震。异常变化量值分别为3×10-8、6.3×10-8,持续时间分别为7小时、3天;而且震前异常应变性质与震时山东省各台伸缩仪同震应变性质较一致,与测震仪初动反应的受力状态一致,异常信度较高。认为是板块边界俯冲带强震的静地震现象,并对异常产生的机理进行了讨论。Since the SS-Y tensometer has been running at Taian station, its EW component had recorded only two anomalies corresponding two Japanese double earthquakes：the M8.0 ,M7.1 earthquakes occurred on Sept. 29, 2003 and M7.2 ,M7.4 earthquakes on Sept. 5,2004 （from China Seismic Network）, and the magnitudes of anomaly were 3 × 10 ^-8, 6.3 × 10^-8, their durations were 7 hours, 3 days respectively. The characteristics of anomalies before earthquakes consisted with the coseismic strain effects （coseismic step） of other two tensometers installed at Yantai and Malinshan stations,moreover,with the loaded state of first motion of seimographs at the same stations. All of these evidences indicated the high reliability of these anomalies. These anomalies may be regarded as ＂quiet earthquake＂ before strong earthquakes, or as a result of pre-displacement of strong earthquakes.

关 键 词：泰安伸缩仪 EW分量 固体潮畸变 静地震 预位移 

分 类 号：P315.725[天文地球—地震学]