Discussion on strain tidal factor separation and anisotropy——Analysis of first data of borehole component strain-meter of China''''s digital seismological observational networks
钻孔应变观测中潮汐因子离散性与各向异性原因探讨——“十五”数字地震观测网络分量钻孔应变仪首批观测资料分析解释

The National Digital Seismological Observational Networks plans to install in China's mainland 40 YRY-4 Borehole Strain meters developed by CHI Shun-liang.First set of data has been analysesed,and from the best quality data,relative accuracy of M2 wave factor can reach 0.001,which is better than the best long-base cave strain meters.We also discovered at various borehole strain-meter stations tidal response(tidal factor) are separate and have orderly anisotropy.We believe that fault isolation is the cause of separation and anisotropy.Finite element model of fault block's azimuth response has contingency with measured response,which supports this hypothesis.The anisotropy of tidal response will be helpful at geologic structure research,city fault survey,land block micro activity,earthquake intensity area delimit.And it can also improve tidal displacement revises of GPS data.