摘要
本文应用中国大陆"十五"数字化观测网络实施的分量式钻孔应变观测资料,介绍了观测站的基本情况,分析了固体潮观测精度.利用固体潮理论反演剪应变观测数据的潮汐响应参数,获得了剪应变耦合系数和相位滞后参数,反演结果显示出现系统偏离的相位滞后最大可达10小时左右,而耦合系数总体偏小;并结合构造对有关剪应变系统偏离的机制进行了讨论.利用有限元数值模拟方法,通过采用均匀介质以及不同走向断层的模型设置,对剪应变理论值和观测值进行了模拟,进一步分析剪应变方向与断层走向的关系,数值模拟结果显示,当剪应变方向接近与断层走向平行时,相位滞后偏离较大,相位滞后最大可偏离11.5小时左右,而耦合系数相对较小,与反演结果基本吻合.本文最后对介质各向异性与构造的关系等有关问题进行了讨论.
In this paper,using the data of borehole component strain-meter of China digital seismological observation network,the state of surveying sites are described and data precision are analyzed.Based on the tidal theory the coupling coefficients and phase lags of shear strain are inversed by using surveying data.The inversion results show that the systematic bias of maximum phase lag is up to about 10 hours,and overall coupling coefficients are small. The mechanism of the systematic bias of shear strain is discussed by combining the fault strike.The theoretical and observational shear strain were calculated based on the different finite element model,which using homogeneous medium and different strike fault with different viscosity coefficient.The relation between orientation of shear strain and fault strike is studied.The results show when the orientation of shear strain is close to the fault strike,the maximum phase lag is up to 11.5 hours,simultaneously the coupling coefficients are relative small,which are consistent with the inversion results approximately. This paper also discusses the relationship between media anisotropy,fault and other related issues.
出处
《地球物理学进展》
CSCD
北大核心
2014年第5期2461-2465,共5页
Progress in Geophysics
基金
地震行业科研专项(201108009-3)资助
关键词
钻孔应变
剪应变
相位滞后
耦合系数
系统偏离
断层
borehole strain
shear strain
phase lag
coupling coefficient
deviation
fault
