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Earthquake Research in China 2013年第3期27卷 316-330页

作者： Gu Shenyi Liu Bowei Zhang Hui Liu Yang Xie Xiaojing Ye Xiangding Earthquake Administration of Hainan Province East China University of Science and Technology

Heat flow is inevitably accompanied by temperature change,thus,the water temperature coseismic response during earthquake activity should also obey the laws of *** the M S8.0 Wenchuan,Sichuan,China earthquake and the M9.0Tohoku,Japan earthquake as an example,and based on the data of water temperature coseismic responses observed in well ZK26 in Haikou,Hainan Province,China,we investigate the relationship between well water temperature change and heat transfer in the coseismic response process and the relevant thermodynamic mechanism by using the numerical simulation method for thermodynamic ***,through forward modeling,we obtain several simulation curves of water temperature change in response to earthquakes along the well depth at different *** simulated curves of water temperature change approximately fit the observed ***,based on the variation of temperature,we find that the modes of well water temperature coseismic response( ascending,descending or stable) are related to factors such as the location of sensors,distribution and location of heat sources,the span between sensors and heat sources.

关键词： Water temperature coseismic response Thermodynamics Numericalsimulation Earthquake

coseismic responses of groundwater levels in the Three Gorges well-network to the Wenchuan M_S8.0 earthquake

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Earthquake Science 2009年第2期22卷 143-148页

作者： Chenglong Liu Guangcai Wang Weihua Zhang Jiangchang Mei Institute of Geology China Earthquake Administration Beijing 100029 China School of Water Resources and Environment China University of Geosciences Beijing 100083 China Institute of Seismology China Earthquake Administration Wuhan 430071 China

We systematically analyze coseismic responses and post-seismic characteristics of groundwater levels in the Three Gorges well-network to the Ms8.0 Wenchuan earthquake on 12 May 2008. The results indicate that these characteristics differ among wells. On the conditions of similar borehole configurations, the differences are associated with geological structural sites of wells, burial types of aquifers monitored, and transmissivities of aquifer systems. We explored coseismic and post-seismic step-rise and step-drop mechanical mechanisms and their implication to earthquake prediction. We validated the inference that the residual step-rise zone is a possible earthquake risk zone based on recent seismic activity on the Xiannüshan fault in the area.

关键词： well level coseismic response Three Gorges well-network Wenchuan earthquake post-seismic step

response of vertical deformation on faults to remote strong earthquakes

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Acta Seismologica Sinica(English Edition) 2007年第2期20卷 172-179页

作者：荆燕张世中李宏熊玉珍刘凤秋孙启伟董建业张鸿旭陈葛天 Institute of Crustal Dynamics China Earthquake Administration

Vertical coseismic deformation on non-causative fault caused by remote strong earthquakes （epicentral distance ≥1 500 km, Ms≥7.0） are observed by fault-monitoring instruments of new type during recent two years. The monitoring result shows, delay time, maximum amplitude and duration of vertical deformation on the non-causative fault have remarkable close relationship with earthquakes magnitude and epicentral distance. The delay time of vertical coseismic deformation have positive linear relationship with epicentral distance. The velocity of coseismic deformation is 5.5 km/s, close to the velocity of surface wave in granite. The logarithms of maximum amplitude of coseismic deformation and epicentral distance have remarkable linear relationship with magnitude. The greater the magnitude and the closer the epicentral distance are, the bigger the maximum amplitude of coseismic deformation on non-causative fault will be. Relative to the epicentral distance, the magnitude is the most important factor to the duration of coseismic vertical deformation on the non-causative fault. Stronger earthquake causes longer vibration duration of coseismic deformation. The experiential equation of co-seismic deformation faults obtained by this work is significant on the coseismic deformation research.

关键词： vertical fault deformation remote strong earthquakes coseismic response

Electromagnetic Abnormity Recorded by Borehole TOA Installment during the Mojiang M_S5. 9 Earthquake on September 8,2018

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Earthquake Research in China 2019年第4期33卷 648-660页

作者： LI Mei LI Wuxian ZHAO Huaxing ZHANG Li ZHANG Ping ZHANG Xuhui YU Chen China Earthquake Networks Center Beijing 100045China Earthquake Agency of Dali Bai Prefecture.No.10 Fuwen Road Dali 671000YunnanChina Yunnan Earthquake Agency No.146 Beichen RoadPanlong DistrictKunming 650011China

As an achievement of the cooperation with Japan,TOA electromagnetic observation station was established with an 800 m borehole antenna and put into service in 1992 in Dali,Yunnan province,*** Wuxian et al.(2003)summarized main anomalous variation characters by analyzing 23 strong earthquakes with magnitudes more than 5.0 recorded in the first ten *** work mainly presents the electromagnetic changes prior to the last Mojiang MS5.9 earthquake on September 8,*** of all,the initial weak signals appeared in two ULF channels out of three observing channels(CH10.01-0.10 Hz,CH20.1-1.0 Hz and CH31-9 kHz)on May 30,2018 at Dali TOA electromagnetic *** information recorded was characterized by wave-like changes with magnitudes of ACH1≤0.26 mV in CH1 and pulse-like impulses of ACH2≤0.6 mV in CH2,***,abnormal information gradually enhanced either in magnitudes or in occurrence ***-like signals were full of lattices of recording paper for CH2 during June24-25 and slopped over the recording paper during June 28-29,with the magnitudes being greater than or equal to 10 *** the same time,the clear wave-like signals also appeared in CH1 with a maximum magnitude of^0.6 mV on June 28 and reached its *** then on,the information started to decrease from the end of July and only weak signals occasionally occurred till the end of August 2018,when obvious anomaly was recorded again in two ULF channels with maximum magnitudes of ACH1~0.2 mV and ACH2~0.3 mV ***,these signals did not appear continuously but group by group and accumulated intensively only in ULF band instead of VLF band during the total period.10 days later,the Mojiang MS5.9 earthquake occurred on September 8,2018,300 km away from Dali TOA station,and a coseismic response was also recorded at this ***,these ULF electromagnetic abnormities could be probably attributed to the Mojiang event.

关键词： Mojiang M_S5.9 earthquake Borehole electromagnetic abnormity coseismic response