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
The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter
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
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.
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.
Zehua Qiu, Shunliang Chi, Zhenming Wang, Seth Carpenter, Lei Tang, Yanping Guo, Guang Yang. The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter[J]. 《地震学报》英文版, 2015, 28(3): 209-214.
Zehua Qiu, Shunliang Chi, Zhenming Wang, Seth Carpenter, Lei Tang, Yanping Guo, Guang Yang. The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter. Earthquake Science, 2015, 28(3): 209-214.