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The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter |
Zehua Qiu1, Shunliang Chi2, Zhenming Wang3, Seth Carpenter3, Lei Tang1, Yanping Guo1, Guang Yang4 |
1 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
2 Earthquake Administration of Hebi, Hebi 458000, He’nan Province, China
3 Kentucky Geological Survey, University of Kentucky, Lexington, KY 40506, USA
4 Guza Seismic Station, Earthquake Administration of Sichuan Province, Kangding 626001, Sichuan Province, China |
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Abstract At a sampling rate of 100 samples per second, the YRY-4 four-gauge borehole strainmeters (FGBS) are capable of recording transient strains caused by seismic waves such as P and S waves or strain seismograms. At such a high sampling rate, data from the YRY-4 strainmeters demonstrate fairly satisfactory self-consistency. The strain tensor seismograms demonstrate the senses of motion of P waves, that is, the type of seismic wave travels in the direction of the maximum normal strain change. The observed strain patterns of S waves significantly differ from those of P waves and should contain information about the source mechanism. Spectrum analysis shows that the strain seismograms are consistent with conventional broadband seismograms from the same site.
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[1] |
Yongge Wan, Zheng-kang Shen, Min Wang, Yuehua Zeng, Jichao Huang, Xiang Li, Huawei Cui, Xiwei Gao. Co-seismic fault geometry and slip distribution of the 26 December 2004, giant Sumatra–Andaman earthquake constrained by GPS, coral reef, and remote sensing data[J]. Earthquake Science, 2015, 28(3): 187-195. |
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