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[1]LIAO Lixia,LIN Zhiying,MO Peichan,et al.Analysis of Seismic Reflection Ability of the Guangdong,Guangxi,Hainan Fluid Network to Regional Moderate-strong Earthquakes[J].Journal of Seismological Research,2022,45(02):290-299.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0030]

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Analysis of Seismic Reflection Ability of the Guangdong,Guangxi,Hainan Fluid Network to Regional Moderate-strong Earthquakes

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 02 Page number: 290-299 Column: Public date: 2022-05-20

Title:: Analysis of Seismic Reflection Ability of the Guangdong,Guangxi,Hainan Fluid Network to Regional Moderate-strong Earthquakes

Author(s):: LIAO Lixia¹; LIN Zhiying¹; MO Peichan²; TIAN Lei³; (1.Fujian Earthquake Agency,Fuzhou 350001,Fujian,China)(2.Guangxi Zhuang Autonomous Region Earthquake Agency,Nanning 530022,Guangxi,China)(3.China Earthquake Networks Center,Beijing 100045,China)

Keywords:: the Guangdong; Guangxi; Hainan fluid network; annual dynamic variation of water level; abnormal trend; seismic reflection capacity; the Cangwu M_S5.4 earthquake; the Jingxi M_S5.2 earthquake; the Beiliu M_S5.2 earthquake

CLC:: P315.723

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0030

Abstract:: By analyzing the fluid observation data of the Guangdong,Guangxi,Hainan fluid network within 300 km of the epicenter of the Cangwu M_S5.4 earthquake,the Jingxi M_S5.2 earthquake and the Beiliu M_S5.2 earthquake,it is considered that the most significant seismic reflection characteristics of the network are trend and group,which are specifically manifested in the long-term background trend anomaly of synchronous(or quasi synchronous)water level of multiple wells on the same fault zone or the same group of parallel fault zones.The annual dynamic variation anomaly in the middle period and the high water level anomaly in the first half year before the earthquake,and the annual dynamic variation of water level and cumulative gravity anomaly show synchronization in time and superposition in space.The calculation of hydrogeological parameters of aquifer and the inversion of water level stress show that the pressure increases,the porosity decreases,the permeability coefficient increases and the water level rises before the three earthquakes,which are in line with the hydrodynamics mechanism.It shows that the water level observation network of Guangdong,Guangxi and Hainan can truly reflect the change of regional stress field.The annual dynamic distortion and accelerated rise of water level before the earthquake are the characteristics of regional stress enhancement.The comprehensive analysis shows that the water level observation network of Guangdong,Guangxi and Hainan is sensitive to medium-strong earthquakes in this area and has good seismic reflection ability.

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Last Update: 2022-05-20