20 April 2016 Stress-strain sensor for monitoring seismic precursors and fault activities in the sand
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In this paper, a sensor to monitor stress-strain signals in a granular medium is used to detect seismic precursory information. Compared with the widely used sensors of borehole stress in the rock, the sensor has more convenient operation, higher output sensitivity, compactness and farther propagation effect. The stress and strain changes before Pu’er Ms6.4 earthquake in China are recorded by Beijing and Xinmin stations, and its corresponding fault activities are analyzed. Study indicates anomalous amplitude of strain signal reaches 10 times higher than that of ordinary background, and compressive oscillation and extensional oscillation occurred constantly before the earthquake. The method and results presented in the paper provide a new way for investigating seismic precursors for shallow-source earthquakes.
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Qiujiao Du, Qiujiao Du, Wei Sun, Wei Sun, Zuoxun Zeng, Zuoxun Zeng, } "Stress-strain sensor for monitoring seismic precursors and fault activities in the sand", Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 980353 (20 April 2016); doi: 10.1117/12.2239334; https://doi.org/10.1117/12.2239334

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