山西几口观测井水位同震响应特征及机理研究#孙婷婷1,王广才1,2,史浙明1**510152025303540(1.中国地质大学(北京)水资源与环境学院,北京100083;2.中国地质大学(北京)地下水与环境演化教育部重点实验室,北京100083)摘要:汶川Ms8.0、日本Ms9.0地震引起了一两千公里之外的山西介休、孝义、祁县三口井较大幅度的水位同震响应。为了更好地理解水位同震响应机制,我们选取了介休、孝义、祁县三口井2008年1月~2011年12月水位数据,分析了三口井两次地震水位同震响应特征,并初步探讨了水位同震变化机理。结果表明:介休、孝义、祁县三口井响应灵敏度较高,无论在响应时间上还是幅度上都有很好的映震能力。汶川地震时各井的同震水位变化形态主要为阶变和缓变;日本地震则主要为振荡和阶变。根据对各井地震前后的含水层参数分析后发现,介休井与孝义井在两次地震前后渗透性变化较小,而祁县井在两次地震中均显示出明显的渗透性减小的现象。但是地震波自身性质、井所处的构造部位、地下水类型及含水层渗透性大小均影响着水位同震响应特征;结合地震仪、应变仪等数据,提高井的采样率,将有助于同震响应机理的深入研究。关键词:井水位;同震响应;动态应变;渗透性:P641CharacteristicsandMechanismofCo-seismicResponseofWater-levelfromseveralwells,ShanXiSUNTingting1,WANGGuangcai1,2,SHIZheming1(1.SchoolofWaterResourcesandEnvironment,ChinaUniversityofGeosciences,Bei激ng100083;2.MOEKeyLaboratoryofGroundwaterCirculationandEnvironmentEvolution,ChinaUniversityofGeosciences,Bei激ng100083)Abstract:TheWenchuanMs8.0earthquakeandtheJapanMs9.0earthquakehavecauseddistinctiveco-seismicresponseofwater-levelin激exiu,XiaoyiandQixianwellsinShanxiProvince,whichareseveralthousandskilometersawayfromtheepicenters.Forbetterunderstandingthemechanismofwater-levelco-seismicresponse,water-leveldatafromJan.2008toDec.2011in激exiu,XiaoyiandQixianwellsarecollected.Thepaperanalyzescharacteristicsofco-seismicresponseofthethreewellscausedbythetwoearthquakes,andpreliminarilydiscussesthemechanismofco-seismicchanges.Resultsshowthatthesethreewellshaveagoodabilityofrecordingearthquakewithhighresponsesensitivity,whetherinresponseoftimeoramplitude.Theformsofco-seismicchangesinWenchuanearthquakeweremainlystep-likeorsustainedchanges,whiletheJapanearthquakecausedwaterlevelinthesewellstooscillateorproducestep-likechanges.Afteranalyzingtheaquiferparametersofeachwellbeforeandaftertheearthquake,thechangesinpermeabilityof激exiuandXiaoyiwellwerefoundtobesmall,whilethepermeabilityofQixianwelldecreasedsignificantlyafterthesetwoearthquakes.Thecharacteristicsofwater-levelco-seismicresponseareaffectedbythenatureofseismicwave,thestructuralpartsofthewells,thegroundwatertypeandthepermeabilityoftheaquifer.Increasingthesamplingrateofthewells,thenumberofwellswillcontributetofurtherresearchinthemechanismofco-seismicresponse.Keywords:water-level;co-seismicresponse;dynamicstain;permeability45基金项目:国家自然科学基金(40930637);地震行业科研专项(200808079);教育部博士点基金(20100022110001);中央高校基本科研业务费专项资金资助(2652013088)作者简介:孙婷婷,(1987-),女,硕士在读,地震地下水,煤矿地下水。通信联系人:王广才,(1962-),男,教授,同位素水文学与水文地球化学;地下水污染评价理论和方法;地下水与地震;矿区水资源评价和矿井突水预测预报。wanggc@cugb.edu-1-。当地震发生时,这些井孔中的地下水位往往会发生变化。。因此,对中场范围内的同震地下水位变化,获得井含水层系统地震前后含水层参0引言地下流体是地壳中最活跃的组分之一,常常能够灵敏地反映地壳应力应变信息。对于封闭性较好的承压井含水系统,能够探测到地壳中十分微小的应力...