地震研究

对广西2016年苍梧5.4级地震、2019年靖西5.2级地震、2019年北流5.2级地震震中300 km范围内粤桂琼流体台网观测资料进行梳理,认为该台网最显著的映震特征是趋势性和群体性,具体表现为同一条断裂带或同一组平行的断裂带上多井水位出现同步(或准同步)长期的背景性趋势异常、中期的年动态畸变异常和震前半年的高水位异常,且水位年动态畸变与累积重力异常呈现出时间上的同步性、空间上的叠加性。含水层水文地质参数计算及水位应力反演显示,3次地震前压力增强、孔隙度减小、渗透系数增大、水位上升,均符合水文动力学机制,表明粤桂琼流体台网能够真实反映区域应力场的变化,震前水位年动态畸变及加速上升是区域应力增强的表征。综合分析认为粤桂琼流体台网对区域中强地震反映灵敏,具备较好的映震能力。

By analyzing the fluid observation data of the Guangdong,Guangxi,Hainan fluid network within 300 km of the epicenter of the Cangwu MS5.4 earthquake,the Jingxi MS5.2 earthquake and the Beiliu MS5.2 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.

引言
1 粤桂琼流体台网概况
2 资料选取及异常提取方法
3 粤桂琼流体台网映震特征分析
4 异常成因分析
5 粤桂琼流体台网映震能力分析
6 结论与讨论

图1 粤桂琼流体台网空间分布图<br/>Fig.1 Spatial distribution of the Guangdong,Guangxi,Hainan fluid networks

图1 粤桂琼流体台网空间分布图
Fig.1 Spatial distribution of the Guangdong,Guangxi,Hainan fluid networks

图2 3次地震震中300 km范围内观测井水位趋势上升动态图<br/>Fig.2 Rising trend of the water level of observation wells within 300 km from the epicenter of the three M≥5.0 earthquakes

图2 3次地震震中300 km范围内观测井水位趋势上升动态图
Fig.2 Rising trend of the water level of observation wells within 300 km from the epicenter of the three M≥5.0 earthquakes

图3 3次地震震中300 km范围内观测井水位年动态畸变图<br/>Fig.3 Annual dynamic distortion of the water level of observation wells within 300 km from the epicenter of the three M≥5.0 earthquakes

图3 3次地震震中300 km范围内观测井水位年动态畸变图
Fig.3 Annual dynamic distortion of the water level of observation wells within 300 km from the epicenter of the three M≥5.0 earthquakes

图4 2014年苍梧5.4级地震震中300 km范围观测井水位动态图<br/>Fig.4 Water level dynamic diagram of observation wells within 300 km from the epicenter of the Cangwu M5.4 earthquake in 2014

图4 2014年苍梧5.4级地震震中300 km范围观测井水位动态图
Fig.4 Water level dynamic diagram of observation wells within 300 km from the epicenter of the Cangwu M5.4 earthquake in 2014

图5 平1井孔隙度、渗透系数时序动态图<br/>Fig.5 Dynamic diagram of time series porosity and permeability coefficient of Pingma 1st well

图5 平1井孔隙度、渗透系数时序动态图
Fig.5 Dynamic diagram of time series porosity and permeability coefficient of Pingma 1st well

图6 北海井水位(a)和信宜1号井流量(b)时序曲线<br/>Fig.6 Time series curve of water level of Beihai well(a)and flow of Xinyi 1st well(b)

图6 北海井水位(a)和信宜1号井流量(b)时序曲线
Fig.6 Time series curve of water level of Beihai well(a)and flow of Xinyi 1st well(b)

图7 平1井垂向应力变化时序曲线<br/>Fig.7 Time series curve of the vertical stress change of water level of Pingma 1st well

图7 平1井垂向应力变化时序曲线
Fig.7 Time series curve of the vertical stress change of water level of Pingma 1st well

图8 苍梧、靖西、北流地震震源机制解及区域构造<br/>Fig.8 Focal mechanism solutions of the Cangwu,Jingxi and Beiliu earthquakes and structures in the vicinity

图8 苍梧、靖西、北流地震震源机制解及区域构造
Fig.8 Focal mechanism solutions of the Cangwu,Jingxi and Beiliu earthquakes and structures in the vicinity

表1 苍梧、北流、靖西地震前兆反应观测井统计<br/>Tab.1 Statistics of observation wells with precursors of the Cangwu,Beiliu and Jingxi earthquakes

表1 苍梧、北流、靖西地震前兆反应观测井统计
Tab.1 Statistics of observation wells with precursors of the Cangwu,Beiliu and Jingxi earthquakes

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备注

引言

1 粤桂琼流体台网概况

2 资料选取及异常提取方法

3 粤桂琼流体台网映震特征分析

4 异常成因分析

5 粤桂琼流体台网映震能力分析

6 结论与讨论

期刊信息