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  1. Article

    Open Access

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

    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. A...

    Zehua Qiu, Shunliang Chi, Zhenming Wang, Seth Carpenter, Lei Tang… in Earthquake Science (2015)

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  2. No Access

    Article

    Abnormal strain changes observed at Guza before the Wenchuan earthquake

    An YRY-4 type borehole strainmeter at Guza station on the southwest end of the Longmenshan fault zone recorded anomalous changes from time to time since about one year before the Wenchuan earthquake. The anoma...

    ZeHua Qiu, BaoHong Zhang, ShunLiang Chi, Lei Tang, Mo Song in Science China Earth Sciences (2011)

  3. Article

    Systematic examination of ‘precursor waves’ of strong earthquakes by using the wavelet method

    Based on the borehole strainmeter recordings immediately before the strong earthquakes (MS≥7.5) during the period from 2001 to 2005 observed at the Taian observation station, Shandong Province, the authors make a...

    Longshou Zhou, Zehua Qiu, Lei Tang, Baoxiang Kan in Earthquake Science (2009)

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  4. No Access

    Article

    Observations of remote coseismic stress step-changes

    The study on stress triggering and stress shadow is a frontier subject of current seismologic research. One of the problems presently encountered is the lack of reliable observation of real coseismic stress ch...

    Zehua Qiu, Yaolin Shi in Science in China Series D: Earth Sciences (2003)