高烈度区的水库地震问题
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摘要
本文提出重视我国中西部高烈度区水库地震问题的基础研究,即水库水域区位于历史地震影响烈度或地震区划在Ⅶ度及以上区域的水库地震问题。这些区域的水库地震研究,不能简单套用一般低烈度区水库诱发地震的一些技术思路和方法,而是需要研究高烈度区水库地震问题的特殊性,主要体现在库区构造环境、断裂活动、随机性背景地震活动水平高等特点。研究水库地震评价问题,包括水库地震强度的预测问题。用金沙江下游梯级水库地震研究事例试图说明这一点。分析水库地震问题,首要抓住在工程设计寿命期间构造地震的潜在危险性这一关键问题。水库地震研究中一些常见的统计预测不合理,应分析水库地震或诱发地震活动需要考虑的地震构造条件、库区岩性条件、地下应力条件、应变积累势态等。
This paper proposes that one should pay attention to the basic research of reservoir induced earthquakes in the high intensity area in mid-western China,namely the earthquakes induced by the reservoir located in the area where the intensity of historical earthquake or seismic regionalization up to Ⅶ degree.To study the reservoir induced earthquake of these areas,the technical ideas and methods generally developed for the area with low intensity should not be simply copied.The particularity of reservoir induced earthquake in high intensity area must be studied,and it is embodied in the structural environment,faulting activities of the reservoir region and the high level of random background seismicity.The evaluation of reservoir earthquake includes the prediction problem of reservoir earthquake intensity.To illustrate this point,we analyze the reservoir induced earthquake of Jinsha river downstream cascade reservoir.To analyze the reservoir induced earthquake,it is the first of all to consider the potential dangers of tectonic earthquake during the engineering design life.Some common method such as statistical predition in the study of reservoir induced earthquake is not reasonable,the conditions of earthquake structure,reservoir lithology,the underground stress and the strain accumulation tendency should be considered.
This paper proposes that one should pay attention to the basic research of reservoir induced earthquakes in the high intensity area in mid-western China,namely the earthquakes induced by the reservoir located in the area where the intensity of historical earthquake or seismic regionalization up to Ⅶ degree.To study the reservoir induced earthquake of these areas,the technical ideas and methods generally developed for the area with low intensity should not be simply copied.The particularity of reservoir induced earthquake in high intensity area must be studied,and it is embodied in the structural environment,faulting activities of the reservoir region and the high level of random background seismicity.The evaluation of reservoir earthquake includes the prediction problem of reservoir earthquake intensity.To illustrate this point,we analyze the reservoir induced earthquake of Jinsha river downstream cascade reservoir.To analyze the reservoir induced earthquake,it is the first of all to consider the potential dangers of tectonic earthquake during the engineering design life.Some common method such as statistical predition in the study of reservoir induced earthquake is not reasonable,the conditions of earthquake structure,reservoir lithology,the underground stress and the strain accumulation tendency should be considered.
引文
[1]周荣军,龚宇,马声浩,等.木格措电站库坝区水库诱发地震的可能性评价.水电站设计,2001,17(2):81-88
[2]程万正,张致伟,阮祥.紫坪铺水库区不同蓄水阶段的地震活动及成因分析.地球物理学进展,2010,25(3):759-767
[3]陈厚群,徐泽平,李敏.关于高坝大库与水库地震的问题.水力发电学报,2009,28(5):1-7
[4]张博庭.西南地质灾害高发区水电站建设安全性研究.水力发电,2009,35(5):5-11
[2]程万正,张致伟,阮祥.紫坪铺水库区不同蓄水阶段的地震活动及成因分析.地球物理学进展,2010,25(3):759-767
[3]陈厚群,徐泽平,李敏.关于高坝大库与水库地震的问题.水力发电学报,2009,28(5):1-7
[4]张博庭.西南地质灾害高发区水电站建设安全性研究.水力发电,2009,35(5):5-11
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