湖南省数字化井水位对尼泊尔M 8.1地震的同震响应特征分析

Analysis on co-seismic response characteristics of digital well water level in Hunan province caused by the Nepal M 8. 1 earthquake

通过分析湖南省数字化井水位对尼泊尔M 8.1地震的同震响应特征,我们发现,同一地震在不同观测井中引起的同震响应特征各不相同.湖南省井水位的同震响应形态以水震波为主,而且对于波动伴随阶变的同震响应类型,总是先记录到水震波然后才产生阶变.认为,同震响应形态的差异性以及初动响应时间的快慢可能与仪器、井况、井孔的构造环境以及水文地质条件等因素有关.湖南省水位观测井对远场大震的远场效应反映较灵敏,能反映区域应力场变化引起的含水层应力应变的变化.

The co-seismic response characteristics of digital well water level in Hunan Province to the Nepal M 8. 1 earthquake are analyzed in this paper, the results display that the co-seismic response characteristics caused by the same earthquake differ from one another in different wells. The main co-seismic response form is water earthquake wave in Hunan Province,and it is always recorded before than water level step in the co-seismic form of water earthquake wave accompanied with water level step. We think,the otherness of co-seismic response forms and the speed of first motion response time are possibly related to instrument,well condition,structural environment,hydrogeological condition of well and et al.The observation wells in Hunan Province are sensitive to the far field effect caused by teleseism,which can reflect the stress-strain change of water-bearing stratum caused by the change of region stress field.