地震研究

通过研究1990—2019年云南普洱大寨井水位的同震响应特征,分析井水位响应特征的变化与后续中强地震的关系,并探讨含水层渗透性对区域构造活动的影响。结果显示:当同震响应幅度偏离统计关系时,井孔周边区域后续地震活动有所增强; 固体潮相位差由负值变为正值,表明观测井孔含水层渗透性参数发生改变,这与区域地震活动的变化可能存在一定的相关性。分析认为,井水位同震响应和含水层渗透性参数变化可作为探索区域构造和地震活动的参考指标。

In this paper,we studied the commonalities and differences of the co-seismic responses recorded in the water level of the Pu'er well,analyzed the relationship between the change in the earthquake recording ability of the observation well and the subsequent earthquakes,and discussed the response of the aquifer permeability to regional tectonic activity.The results show that,when there were some significant differences in co-seismic response amplitude from the statistical relationship and the maximum amplitude of the waveform,there was a certain correlation with subsequent seismicity in the area.The phase-lag changed from negative to positive,while the permeability of the observation wellbore aquifer changed,which also had certain correlation with the seismicity or other fluid observations in the area.It showes that the changes in co-seismic response and aquifer permeability can be used as parameters for judging regional structure and seismic activity.

引言
1 观测井基本概况
2 同震响应的特征
3 同震引起的井-含水层系统渗透性变化分析
4 结论

图1 普洱大寨井构造位置图(a)及井孔柱状图(b)<br/>Fig.1 Geological setting and location of the Dazhai well(a)and its bore structure(b)

图1 普洱大寨井构造位置图(a)及井孔柱状图(b)
Fig.1 Geological setting and location of the Dazhai well(a)and its bore structure(b)

表1 普洱大寨井地下流体观测情况<br/>Tab.1 Observation items of underground fluids in the Dazhai well

表1 普洱大寨井地下流体观测情况
Tab.1 Observation items of underground fluids in the Dazhai well

图2 普洱大寨井动水位(a)及辅助流量(b)观测曲线(日均值)<br/>Fig.2 Curve of groundwater level(a)and water-flow quality(b)of the Dazhai well(daily value)

图2 普洱大寨井动水位(a)及辅助流量(b)观测曲线(日均值)
Fig.2 Curve of groundwater level(a)and water-flow quality(b)of the Dazhai well(daily value)

图3 1990—2018年云南及邻区6级以上震中分布图<br/>Fig.3 Distribution of M≥6.0 earthquakes in Yunnan and its adjacent area from 1990 to 2018

图3 1990—2018年云南及邻区6级以上震中分布图
Fig.3 Distribution of M≥6.0 earthquakes in Yunnan and its adjacent area from 1990 to 2018

表2 1990—2018年普洱大寨井水位同震阶变表<br/>Tab.2 Co-seismic water level step-like changes in the Dazhai well from 1990 to 2018

表2 1990—2018年普洱大寨井水位同震阶变表
Tab.2 Co-seismic water level step-like changes in the Dazhai well from 1990 to 2018

图4 普洱大寨井动水位同震响应<br/>Fig.4 Co-seismic hydrological response of the Dazhai well induced by earthquakes

图4 普洱大寨井动水位同震响应
Fig.4 Co-seismic hydrological response of the Dazhai well induced by earthquakes

图5 同震响应计算幅度与实际幅度差值<br/>Fig.5 Difference between theoretical and actual amplitudes of co-seismic response

图5 同震响应计算幅度与实际幅度差值
Fig.5 Difference between theoretical and actual amplitudes of co-seismic response

表3 2000—2018年思茅台记录的9次地震的同震响应幅度和波形最大振幅速度<br/>Tab.3 Co-seismic response amplitude and maximum seismic wave amplitude velocity of 9 earthquakes recorded by the Simao well from 2000 to 2018

表3 2000—2018年思茅台记录的9次地震的同震响应幅度和波形最大振幅速度
Tab.3 Co-seismic response amplitude and maximum seismic wave amplitude velocity of 9 earthquakes recorded by the Simao well from 2000 to 2018

图6 同震响应幅度与地震波形振幅速度散点分布图(a)及残差(b)<br/>Fig.6 Scatter distribution(a)and residual(b)of co-seismic response amplitude and seismic wave amplitude velocity

图6 同震响应幅度与地震波形振幅速度散点分布图(a)及残差(b)
Fig.6 Scatter distribution(a)and residual(b)of co-seismic response amplitude and seismic wave amplitude velocity

图7 普洱大寨井含水层相位差时间进程(月值)<br/>Fig.7 Time series of phase-lag angle of aquifer in the Dazhai,well(monthly value)

图7 普洱大寨井含水层相位差时间进程(月值)
Fig.7 Time series of phase-lag angle of aquifer in the Dazhai,well(monthly value)

图8 普洱大寨井水化学离子测项观测曲线(日值)<br/>Fig.8 Curves of geochemical items in the Dazhai well(daily value)

图8 普洱大寨井水化学离子测项观测曲线(日值)
Fig.8 Curves of geochemical items in the Dazhai well(daily value)

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备注

引言

1 观测井基本概况

2 同震响应的特征

3 同震引起的井-含水层系统渗透性变化分析

4 结论

期刊信息