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The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter

Earthquake Science 2015年第3期28卷 209-214页

作者： Zehua Qiu Shunliang Chi Zhenming Wang Seth Carpenter Lei Tang Yanping Guo Guang Yang Institute of Crustal Dynamics China Earthquake Administration Earthquake Administration of Hebi Kentucky Geological Survey University of Kentucky guza seismic station Earthquake Administration of Sichuan Province

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.

关键词： Four-gauge borehole strainmeter（FGBS） Strain seismogram P-wave S-wave Self-consistency Spectrum analysis

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Abnormal strain changes observed by a borehole strainmeter at guza station before the Ms7. 0 Lushan earthquake

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Geodesy and Geodynamics 2013年第3期4卷 19-29页

作者： Qiu Zehua Yang Guang Tang Lei Guo Yanping Zhang Baohong Institute of Crustal Dynamics China Earthquake Administration guza Seismostation Earthquake Administration of Sichuan Province

Several days before the MsT. 0 Lushan earthquake, the YRY-4 borehole Strainmeter at guza station recorded prominent abnormal changes. The strain anomalies are very striking on the smooth background of several years＇ recording after the Wenchuan earthquake. However, because construction in the town of guza has been undergoing rapid development in recent years, many factors have interfered with observations at the station. Whether or not the observed strain changes before the Lushan earthquake were affected by any of the sources of interference becomes a question that must be answered. Among the likely sources of interference, apartment construction, sportsground reconstruction, and tunnel cutting can be excluded by analyzing the morphological characteristic of the anomalies. The two remaining most possible sources are road construction in front of the station and the water level change of the nearby Dadu River caused by water filling into and discharging from an upstream reservoir. Through field investigation, comparison of the correlation between the strain and the seismographic recordings, comparison of the correlation between the strain and the Dadu River flow recordings, and analysis of the strain anomaly characteristics, we conclude that the abnormal changes observed at guza station cannot be attributed to either of these two sources but should be related to the Lushan earthquake.

关键词： Lushan earthquake earthquake precursor borehole strain observation YRY-4 borehole strain- meter interference

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