基于分量钻孔应变资料分析测区构造应变变化

Abstract

Abstract: According to the “Double Bushing” theoretical model and strain theory, the tectonic strain is calculated based on the observation data from the borehole straingaugeat Yixian Station. First, considering the inconsistent sensitivity of the components of borehole strain gauge, relative field calibration is applied to the data. The results show that the reliability increased from 0.7557 to 0.9344. Second, the theoretical solid tide method is used for absolute calibration of borehole strain to obtain the coupling coefficient. At last, the strain parameters of Yixian station observation point are obtained by strain conversion.The results show that the rates of the dilation strain ε_a and maximum shear strain ε_s are 2440 ns/a and 230 ns/a respectively. The main direction of strain is 138°. According to the above mentioned results, the tectonic strain near the Yixian Station is in a stable state of expansion.

Key words: “Double Bushing” theoretical model, Multi-components borehole straingauge, Strain parameter, Tectonic strain change

CLC Number:

P315.7

ZHANG Xiao, QI Yu-yan, YUN Meng, LI Hui, SHE Ya-wen. Analysis on Changes of the Tectonic Strain in Survey Area Based on Multi-Component Borehole Straingauge[J]. EARTHQUAKE, 2019, 39(4): 76-83.

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Analysis on Changes of the Tectonic Strain in Survey Area Based on Multi-Component Borehole Straingauge

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