鲁甸MS 6.5地震前昆明地震台定点形变观测异常分析  

About abnormal characteristics of deformation data before Ludian M_S 6.5 earthquake at Kunming Seismic Station

作　　者：常玉巧 钱文品 杨仁华 姚休义 

机构地区：[1]昆明基准地震台,中国云南650204 [2]云南省地震预报研究中心,中国昆明650224

出　　处：《地震地磁观测与研究》2016年第3期124-131,共8页Seismological and Geomagnetic Observation and Research

摘　　要：2014年8月3日鲁甸MS 6.5地震前,昆明地震台形变观测4个分量出现短临异常,排除降雨干扰,结合发震断裂性质及相关研究,分析定点形变异常与该地震前地壳活动的内在联系。分析认为,鲁甸6.5级地震前1—2个月,昆明地震台定点形变观测资料异常较为显著,洞体应变NS分量异常突出,是定点形变投入观测以来的显著异常;形变观测资料异常特征与鲁甸地震发震断裂性质吻合较好;NS分量和EW向分量较好记录了此次鲁甸地震NNW—SSE向包谷垴—小河左旋走滑断裂和NEE—SWW向破裂断层的震前活动过程。In order to find abnormality with Ludian MS 6.5 earthquake occurred on August 3,2014.We analyze observational data of fix-point deformation include water tube tiltmeter and extensometer at Kunming Seismic Station which has NS and EW components.The result showed that there was an obvious abnormality about 1—2 months before earthquake.The NS component of extensometer presented process of rising and falling sharply,which has recorded the process of rupture of NNW—SSE Baogunao—Xiaohe fault which appear to left-lateral strike—slip faulting and NEE—SWW fault before earthquake combined with EW component.We thought the obvious abnormality of water tube tiltmeter and extensometer related to Ludian earthquake.

关 键 词：鲁甸6.5级地震 定点形变 异常 包谷垴—小河断裂 

分 类 号：P315.7[天文地球—地震学]