Estimation of borehole strain observations coupling coefficients using teleseismic surface wave and collocated strain seismic wave records observed in Liangshan
Estimation of borehole strain observations coupling coefficients using teleseismic surface wave and collocated strain seismic wave records observed in Liangshan
The two coupling coefficients(A,B)of component borehole strain observation are of great significance for strain measurement.In this paper,the feasibility of surface wave calibration method for borehole strain observation is verified by using the seismic data observed by the seismometers and the collocated strain gauges,which are installed in boreholes of the China Seismic Experimental Site.The statistical results of coupling coefficients,obtained from the multi-frequency surface wave calibration with multiple distant earthquakes,are more stable and reasonable than the calibration results of theoretical earth tide.Increasing the sampling rate of existing borehole strain observation to more than 1 Hz is conducive to further comparative study of far-seismic surface wave recorded by strainmeter and co-point(or near-field)seismometer,and it is helpful to obtain the coupling coefficient results in all frequency bands.These works are of great significance for improving the accuracy of strain observation data and its further application.
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