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Relationship between the Earth tidal factor and phase lag of groundwater levels in confined aquifers and the Wenchuan M_s8.0 earthquake of 2008

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Science China Earth Sciences 2013年第7期56卷 1722-1730页

作者： SHI ZheMing WANG GuangCai School of Water Resources and Environment China University of Geosciences State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

This work focuses on variations of the Earth tidal factor and phase lag derived from groundwater observations before and after major *** is based on an analysis of the data from four observational wells at boundaries between distinct active blocks of China *** wells are also situated on several active fault zones and have exhibited considerable responses to the Wenchuan Ms8.0 earthquake of 2008 in *** collected hourly records of water levels of these wells from 2007to 2009 and processed these data for *** tidal factors,phase lags,and phase-difference changes of tidal residuals of each well were *** found that when the Wenchuan quake happened,the tidal factors of the 4 wells were changing rapidly,while their phase lags and phase differences of tidal residuals declined swiftly,which may reflect the stress and strain changes of the well-aquifer system during the seismic generation.

关键词： tidal factor phase lag phase difference of tidal residual Wenchuan earthquake confined groundwater

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China’s component borehole strainmeter network

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Earthquake Science 2009年第6期22卷 579-587页

作者： Shunliang Chi Earthquake Administration of Hebi Hebi 458030 China

In 2004, China＇s digital seismic observation network project began to deploy 40 sets YRY-4 four-component borehole strainmeters in order to monitor earthquake preparation process. The paper describes observed solid tidal strain discreteness and tidal factor anisotropy, analyzes the reliability of observational data and discusses the cause for this phenomenon. After getting rid of interferences, the network, in two years practice, has observed several pre-seismic strain anomalies at stations close to epicenters especially in the Wenchuan Ms8.0 megaquake. It shows that this borehole strainmeter network is capable of monitoring seismogenic process.

关键词： component borehole strainmeter tidal factor strain anomaly earthquake prediction

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Inversion of the Volumetric Strain of Aquifer According to the tidal Effect of Groundwater in North China

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Earthquake Research in China 2014年第4期28卷 520-531页

作者： Yang Liu Ma Jianying Cao Jingquan Shao Yongxin Liu Wenbing Earthquake Administration of Tianjin Municipality Institute of Geophysics CEA

The change of the confined aquifer level reflects the pore pressure change,and the pore pressure change of the aquifer is closely related to the aquifer pressure. This paper uses the tidal response of the well water level data in the North China region to calculate the tidal factor of each well and extract the effective water trend information. Then,the volumetric strain of an existing confined aquifer well in the North China region is inverted,and the contour maps are plotted on a half-year scale from 2009 to 2012. Results show that it can reflect the state of stress and strain in deep crust to a certain extent in the North China region.

关键词： North China region Water level tidal factor Volumetric strain

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