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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This study was supported by the Special Fund for Earthquake Research in the Public Interest (No. 201108009).
Qui, Zehua; Chi, Shunliang; Wang, Zhenming; Carpenter, Seth; Tang, Lei; Guo, Yanping; and Yang, Guang, "The Strain Seismograms of P- and S-Waves of a Local Event Recorded by Four-Gauge Borehole Strainmeter" (2015). Kentucky Geological Survey Faculty Publications. 1.