[1]LUO Jianwei,LI Yong,YE Jianqing.Seismic Activity Analysis in the Xiluodu Reservoir Affected Area[J].Journal of Seismological Research,2020,43(01):118-124.
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Seismic Activity Analysis in the Xiluodu Reservoir Affected Area
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 01
Page number:
118-124
Column:
Public date:
2020-01-30
- Title:
- Seismic Activity Analysis in the Xiluodu Reservoir Affected Area
- Keywords:
- Xiluodu reservoir; seismicity; focal mechanism; stress drop
- CLC:
- P315.72
- DOI:
- -
- Abstract:
- Utilizing the seismic monitoring data from 2008 to 2018 in the Yunnan and neighboring provinces' regional seismic networks and combining with regional structural characteristics and water load changes in the Xiluodu Reservoir area,the spatial and frequency of seismic activity before and after the impoundment of the reservoir in the Xiluodu Reservoir affected area are comprehensive analyzed,from the strength,strength,etc. We also analyzed the in-depth analysis of regional fault properties,reservoir water level load changes,focal mechanism solutions,and seismic stress drop parameters. The results show that: ①The Quaternary active and inactive faults intersect in the affected area of the Xiluodu Reservoir and nearby areas,the tectonic environment is complex and there are regions with high stress levels; the spatial distribution of earthquakes in the affected area of the reservoir is obviously controlled by the regional structure.②The water level change has a significant impact on the basement rock layer and the bank rock mass in the reservoir area. ③The structure in the area affected by the Xiluodu Reservoir has a high stress background. Under the influence of fluctuations in water load,the stress release in the structural area is triggered,and the water storage effect maks the regional tectonic stress be released in the form of double earthquakes. ④After storage in the reservoir area,the change of the reservoir load has a large disturbance effect on the regional tectonic stress,and there is no obvious sign of attenuation of the continuous microseismic activity in the reservoir area,indicating that the reservoir bank rebuilding continues.
- References:
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Last Update:
2020-01-30