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.
出处
《大地测量与地球动力学》
CSCD
北大核心
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
关键词
泰安伸缩仪
EW分量
固体潮畸变
静地震
预位移
tensometer at Taian station, EW component,earth tide distortion,quiet earthquake,pre-displacement
