| 汶川地震深层地下水位临震异常 |
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| 引用本文： | 兰双双,迟宝明,姜纪沂.汶川地震深层地下水位临震异常[J].吉林大学学报(地球科学版),2011(Z1):272-278. |
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| 作者姓名： | 兰双双 迟宝明 姜纪沂 |
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| 作者单位： | 北京工业大学建筑工程学院;防灾科技学院;中国地震局工程力学研究所; |
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| 基金项目： | 国家地震局项目(22012104) |
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| 摘 要： | 针对短临地震预报难尤其是临震预报难问题,以2008年汶川地震为背景,对受地震影响严重的川、滇、陕、甘、渝5个省市区域内的深层地下水位进行了分析,发现在龙门山断裂带所在的四川省及其NE方向的甘肃省区域,共有7口井水位表现为明显的临震异常,异常形态包括振荡型、脉冲型和阶升型。利用小波变换方法对振荡型及脉冲型异常进行分析,结果表明:临夏、古浪横梁和清水等井水位信号中存在着周期为2～8 min,振幅为5～59 mm的前驱波波形,这是由于震源体慢破裂过程中发出的地震波造成的。阶升型异常幅度较大,分别为129.4 cm和340.8 cm,从震前几分钟一直持续到震后,未恢复到震前状态;表明引起震时地下水剧烈变化的动力作用在震前已经开始,震时变化只是在此基础上进一步发展与加剧。
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| 关 键 词： | 地下水 地震 小波分析 汶川 |
Deep Groundwater-Level Impending Anomaly of Wenchuan Earthquake |
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| LAN Shuang-shuang,CHI Bao-ming,JIANG Ji-yi .College of Architecture , Civil Engineering,Beijing University of Technology,Beijing ,China.Deep Groundwater-Level Impending Anomaly of Wenchuan Earthquake[J].Journal of Jilin Unviersity:Earth Science Edition,2011(Z1):272-278. |
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| Authors: | LAN Shuang-shuang CHI Bao-ming JIANG Ji-yi College of Architecture Civil Engineering Beijing University of Technology Beijing China |
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| Institution: | LAN Shuang-shuang1,CHI Bao-ming2,3,JIANG Ji-yi2 1.College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100021,China 2.Institute of Disaster-Prevention Science and Technology,Sanhe 065201,Hebei,China 3.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China |
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| Abstract: | Due to middle-term and impending anomaly forecast of earthquake is relatively difficult,taking Wenchuan earthquake in 2008 as the studying background,choosing the severely affected areas such as Sichuan,Yunnan,Shaanxi,Gansu and Chongqing Province/City as study region,the deep groundwater-level anomaly characteristic was analyzed in this study.In Sichuan region,where Longmen Mountain fault locates,and Gansu region along NE direction of Longmen Mountain fault,seven wells groundwater-level appeared clear impen... |
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| Keywords: | groundwater earthquakes wavelet analysis Wenchuan |
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