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《Progress in Geophysics》 2014-05
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Analysis on strain tidal factor observed borehole strainmeters

LI Jin-wu;QIU Ze-hua;Institute of Crustal Dynamics,CEA;  
The borehole strainmeters measure changes in diameter of the cylindrical strainmeter housing at different azimuths.Because the strainmeter and the grout in which it is emplaced have different elastic moduli,so the strain is not the same as that which the formation would have experienced were the strainmeter not there.Therefore,during the tide analysis,observations will be converted to strain values.Using the data observed borehole strainmeters from January 1,2008 to April19,2013,relative calibration and absolute calibration,the final,we know the observation points strain components in geographical coordinates. At the same time, we calculate theoretical tidal strain using the radially heterogeneous spherical elastic earth model.We estimate the amplitudes of the M2 in the strainmeter output and the theoretical tidal strain using the t_tide package.We focus the areal strain and its change,so we use the differential value.We discuss the factors affecting tidal factor.We realize the latitude and elevation don't affect tidal factor, but the characteristic of the rock significantly affect tidal factor.
【Fund】: 地震行业科研专项(201108009)资助
【CateGory Index】: P315.728
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