瀑布沟水电站水库天然地震本底特征
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摘要
瀑布沟水电站处于相对稳定的瓦山断块上,水库的库尾位于龙门山断裂带、鲜水河断裂带、安宁河断裂带的交汇部位,地震活动相对强烈。了解和掌握水库蓄水前库坝区及其周围天然地震活动背景水平,可对水库诱发地震的危险性进行前期评价,为蓄水后的诱发地震活动监测预测提供可靠的鉴别依据。在水库蓄水前瀑布沟水库地震台网一期运行逾3年,二期运行逾1年,本文用这批资料提供库区及附近蓄水前天然地震活动水平确切实用的各项指标。用全国和四川台网地震资料,给出含库区的较大区域地震活动背景和对库区的影响,同时给出库区及附近ML≥2.5地震的活动特征。
The Pubugou Dam of hydroelectric power station is located in the stable block of Washan and is near the convergence area formed by Longmenshan,Xianshuihe and Anninghe Faults.The seismic intensity of this region is high.In order to learn the seismic background of this region before and after the impoundment of this dam,we assess the primary risk of induced earthquakes and recognize the seismic genre caused by the natural and induced by the impoundment of this dam.The operation of monitoring network of this dam has run for three years and provides us with satisfactory observation data.The characters of this regional seismicity are summarized.
The Pubugou Dam of hydroelectric power station is located in the stable block of Washan and is near the convergence area formed by Longmenshan,Xianshuihe and Anninghe Faults.The seismic intensity of this region is high.In order to learn the seismic background of this region before and after the impoundment of this dam,we assess the primary risk of induced earthquakes and recognize the seismic genre caused by the natural and induced by the impoundment of this dam.The operation of monitoring network of this dam has run for three years and provides us with satisfactory observation data.The characters of this regional seismicity are summarized.
引文
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[4]牟雅源.冕宁大桥水库蓄水前天然地震活动本底背景研究[J].四川地震,2001,(1):20-26.
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[8]四川赛思持科技有限责任公司,瀑布沟水电站水库诱发地震监测预测研究报告(下闸蓄水阶段)[R].2009,
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[2]张高华,苏金蓉.改善瀑布沟水库数字地震台网定位精度的办法[J].四川地震,2007,(1):40-42.
[3]赵珠,罗昭明,等.二滩水库蓄水前天然地震活动本底背景[J].地震地磁观测与研究,1999,20(2):26-33.
[4]牟雅源.冕宁大桥水库蓄水前天然地震活动本底背景研究[J].四川地震,2001,(1):20-26.
[5]杨国宪,汪雍熙.小浪底水库区天然地震本底特征分析[J].水利学报,2003,(6):89-94.
[6]胡先明.紫坪铺水库蓄水前天然地震活动[J].四川地震,2007,(2):16-21.
[7]四川赛思持科技有限责任公司,瀑布沟水电站水库天然地震活动本底研究报告[R].2009,
[8]四川赛思持科技有限责任公司,瀑布沟水电站水库诱发地震监测预测研究报告(下闸蓄水阶段)[R].2009,
[9]中国地震局监测预报司预报管理处,2010,中国地震目录[R].
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