利用深井地下水位动态研究大华北地区现今构造应力场状态  

Study of present tectonic stress field of Pan-North China region based on ground water level dynamic in deep wells

作　　者：黄辅琼[1] 晏锐[1] 陈颙[2] 车时[2] 王文旭 耿杰[4] 顾瑾萍[1] 

机构地区：[1]中国地震局分析预报中心,北京100036 [2]中国地震局,北京100036 [3]河南省地震局,河南郑州450000 [4]山东省地震局,山东济南250014

出　　处：《地震》2004年第1期112-118,共7页Earthquake

基　　金：国家基础研究重大项目前期研究专项(2001CCA02100);"十五"国家科技攻关项目(15 01 05 06);中国地震局分析预报中心地震预报应急研究专题资助

摘　　要：在水平层状含水层(一维)模式下,根据含水层应力与井水位变化之间的定量关系表达式,利用华北地区40多口深井水位动态变化资料,探索研究华北地区现今构造应力场状态。即水位上升代表构造应力场压性增强张性减弱;水位下降代表构造应力场压性减弱张性增强。初步研究结果表明,1995～1998年华北北部地区张家口 渤海构造带和山西构造带北部水位普遍上升,MS5.0以上地震活动频繁;1999年以后华北地区水位普遍处于下降状态,反映了华北地区1999年以来构造应力场状态以张性为主,整个华北地区MS5.0以上地震活动处于相对平静状态。该结果可为华北地区地震活动性预测研究提供应力场背景信息。According to the quantitative formula of aquifer stress and water level of wells based on 1D half-space horizontal layer model, the present tectonic stress field of Pan-North China region is studied using observational water level data in about 40 wells of ground water observation network of China Seismological Bureau. It is assumed that ascending water level means compression enhances and extension weakens of stress field; descending water level means extension enhances and compression weakens of stress field. Our water level data suggest that the well water level, distributing along Zhangjiakou-bohai tectonic belt and Shanxi tectonic belt, shows ascending and earthquakes with M≥5.0 occurs more frequently at the same time during 1995～1998, which means the compressional stress field enhances, while the water level shows descending and no earthquake with M≥5.0 occurs in whole North China region since 1999, which means the extensional stress field enhances. The result mentioned above may province the background information regarding present tectonic stress field of North China region for earthquake predication research.

关 键 词：深井地下水位 构造应力场 地震活动性 华北地区 

分 类 号：P315.723[天文地球—地震学]