摘要
利用中国地震数字观测网络"十五"计划期间布设的姑咱、小庙台分量钻孔应变观测结果,根据应变固体潮汐观测模型拟合潮汐响应参量耦合系数、相位滞后;利用考虑响应率、相位滞后、气压扰动影响的综合观测模型提取固体潮频段以内的变化,从构造和介质特性的角度对计算结果的时间序列和平面应变图像进行讨论。结果显示,汶川8.0、会理6.1、姚安6.0级地震前,潮汐响应参数和高频信息在震前几个月至1年出现扰动;姑咱台的应变花图像相对稳定,其变形主要受附近的构造所控制。
On the basis of the borehole strain observations at Guza and Xiaomiao stations in the National Digital Seismological Observational Networks,the coupling coefficients and phase lag of tidal response are fitted by using solid tidal strain model.With comprehensive observation model which contains tidal response rate and phase lag and effects of air pressure disturbance,the changes within the tidal band are analyzed.The spatial and temporal changes are discussed from characteristics of geological structure and medium.The results show that anomalies of tidal response parameters and high frequency disturbance had been observed from several months to a year before Wenchuan %M%s8.0,Huili %M%s6.1 and Yaoan %M%s6.0 earthquakes.The strain rosette at Guza station is stable relatively,the deformation is mostly dominated by geological structure.
出处
《大地测量与地球动力学》
CSCD
北大核心
2010年第6期6-9,19,共5页
Journal of Geodesy and Geodynamics
基金
中国地震局地震预测研究所基本科研业务专项(02092432)
关键词
四分量钻孔应变观测
应变固体潮汐
高频异常信息
潮汐响应参数
地震
four-component borehole strain observation
solid tidal strain
high frequence anomaly
tidal response parameter
earthquake
