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《Chinese Journal of Geophysics》 2007-03
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Earth’s free torsional oscillations of the great Sumatra earthquake observed with borehole shear strainmeter

QIU Ze-Hua~1, MA Jin~2, CHI Shun-Liang~3, LIU Hou-Ming~41 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China2 Institute of Geology, China Earthquake Administration, Beijing 100029, China3 Hebi Seismological Bureau, Henan Hebi 458000, China4 Tai'an Observation Station, Shandong Seismological Bureau, Shandong Tai'an 271000, China  
We first studied Earth's free oscillations using observations of borehole strainmeters. Two kinds of borehole strainmeters at the Tai'an Observation Station, TJ dilatometer and RYR shear strainmeter, both have observed the Earth's free oscillations excited by the great Sumatra earthquake occurred on December 26, 2004, with dilatometer for spheroidal modes and shear strainmeter for torsional modes. They also observed coupled modes as well as split modes. Q-values of _0T_8~_0T_ 19 are determined from high-quality data of torsional oscillations. According to recordings of the RYR borehole shear strainmeter in two perpendicular directions, the torsional oscillation symmetrical axis orientation of the earthquake is calculated and found to be quite steady with time and modes. High-precision borehole strainmeter proved to be ideal for crustal deformation observation and able to provide unique data for researches of Earth’s free oscillation.
【Fund】: 国家自然科学基金项目(40374011);; 地震科学联合基金项目(1040037)资助
【CateGory Index】: P315
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