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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

43

期数:

2020年01期

页码:

118-124

栏目:

出版日期:

2020-01-30

文章信息/Info

Title:

Seismic Activity Analysis in the Xiluodu Reservoir Affected Area

作者:

罗建伟; 李 勇; 叶建庆

(云南省地震局,云南 昆明 650224)

Author(s):

LUO Jianwei; LI Yong; YE Jianqing

(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

关键词:

溪洛渡水库;  地震活动性;  震源机制;  应力降

Keywords:

Xiluodu reservoir;  seismicity;  focal mechanism;  stress drop

分类号:

P315.72

DOI:

-

摘要:

利用2008—2018年云南省及邻省区域地震台网的地震监测资料,结合区域构造特征、溪洛渡库区水载荷变化,对溪洛渡水库影响区内水库蓄水前后地震活动空间、频度、强度等进行综合分析,并对区域断层性质、库水位载荷变化、震源机制解、地震应力降参数深入分析。结果表明:①溪洛渡水库影响区及附近区域第四纪活动与不活动的断裂交汇,构造环境复杂且存在应力水平较高区域,水库影响区地震空间分布明显受区域构造控制; ②水库蓄水初期水位变化对库区基底岩层及库岸岩体影响显著; ③溪洛渡水库影响区的构造存在高应力背景,在水载荷变化波动的影响下,触发了构造区的应力释放,且蓄水高水位作用使该区域构造应力以双震的形式得以释放; ④库区蓄水后,水库载荷变化对区域构造应力有较大的扰动作用,库区持续的微小地震活动无明显的衰减迹象,表明库岸再造仍在持续。

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.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2019-03-27
基金项目:中国—东南亚毗邻区大震活动地球动力学研究(2015DFA21260)资助.

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更新日期/Last Update: 2020-01-30