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1、JournalofEngineeringGeology工程地質(zhì)學報1004—9665/2013/21(6)-0932-06三峽近壩庫段水庫誘發(fā)地震特征分析木吳世澤①羅飛①房艷國①嚴福章②朱建①賈海萍①(①長江三峽勘測研究院有限公司武漢430074)(②中國國電公司北京100011)摘要大型水利水電工程水庫誘發(fā)地震歷來受業(yè)主、工程技術(shù)人員的重視。三峽工程蓄水10多年來,在蓄水過程中,三峽庫區(qū)較蓄水前地震明顯增多。本文選擇了三峽庫區(qū)既有活動斷裂,又有可溶巖和煤層分布的近壩庫段作為研究對象,通過對庫區(qū)地震活動與水位的關(guān)系和誘發(fā)地震空間展布特征分析
2、,認為:三峽水庫誘發(fā)地震,發(fā)生在有可溶巖和含煤地層部位的塌陷型地震占總數(shù)的90%,而非可溶巖和不含煤地層中只占總數(shù)的10%;近壩庫段地震主要發(fā)生在仙女山斷層北端,且有地震呈叢集活動的特征;九灣溪斷層上盤遠離長江部位地震零星分布,距長江較近地段地震相對增多,下盤地震極少。地震與水位的對應關(guān)系十分密切,三峽水位上升,長江兩岸發(fā)生的小地震較多,當水位蓄至175m時,地震主要發(fā)生在仙女山斷裂的北端和九灣溪斷裂的上盤及北端。關(guān)鍵詞三峽水庫近壩庫段誘發(fā)地震特征分析中圖分類號:TU411文獻標識碼:ACHARACTERISTICANALYSIS0FRES
3、ERVoIRINDUCEDEARTH—QUAKESNEARBYTHETHREEGoRGESDAMWUShize①LUOFei①FANGYanguo①YANFuzhang②ZHUJian①JIAHaiping①(①ThreeGorgesGeotechnicalConsultantsCo.,Ltd.,Wuhan430074)((~ChinaGuodianCorporation,Beijing100011)AbstractReservoirinducedearthquakesoflarge-scalehydropowerprojecthaveal
4、waysaconcernofownersandtechnicalpersonne1.TheThreeGorgesreservoirhasbeenimpoundedfor10years,andtheearthquake~equencyinthereservoirincreasessignificantlyduringtheimpoundment.Anareanearthedamsiteandwithactivefaults,car—bonafiteandcoalseamsischosenastheresearchobject.Analyzet
5、hespatialdistributionofreservoirinducedearth—quakesandtherelationshipbetweenearthquakeandreservoirwaterleve1.Theanalysisresultsindicatethat90%ofthereservoirinducedearthquakesarecollapsinginducedbyearthquakeswhichoccurredincarbonatiteandcoalseams.TheotherlO%occurredinothers
6、tratums.Italsoindicatesthatthea~itudeofstratumhasasignificanteffectonreservoirinducedearthquakes.Theearthquakesnearthedamsitehaveclusteringdistributioncharacteristic,whichmainlyoccu~edatthenorthernpartofXiannvshanFault.SomeearthquakesoccuredinthehangingwallofJiuwanxifault,
7、whichoccurredmoreatthenearbysiteofYangtzeriverandlessinthefarawaysite,whilerarelyOC-curedintheheadingwallofthefault.Thereservoirinducedearthquakesandreservoirwaterlevelarecloselyrelat—ed.WhilethewaterlevelofThreeGorgesreservoirrises,manysmallearthquakesoccuronbothsidesofYa
8、ngtze十收稿13期:2013-08-08;收到修改稿13期:2013—11—15.第一作者簡介:吳世澤,主要從事區(qū)域地質(zhì)、地震地質(zhì)、工程地質(zhì)勘察工作.Email:532356