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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報1004-9665/2014/22(2)一0292.08鮮水河斷裂帶爐霍段地震滑坡空間分布規(guī)律分析:I=王東輝田凱(中151地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心成都610081)摘要鮮水河斷裂帶爐霍段具有極強的活動性,一旦發(fā)生地震,極有可能引發(fā)大量的滑坡等地質(zhì)災(zāi)害。研究區(qū)發(fā)育1973年地震滑坡179個(通過現(xiàn)場調(diào)查識別出43個),1973年以前地震滑坡62個。本文研究數(shù)據(jù)基于1973年179個及1973年以前62個地震滑坡,共計241個地震滑坡。利用統(tǒng)計分析方
2、法研究了1973年179.個地震滑坡分布與烈度及震中距的關(guān)系,分析了241個地震滑坡發(fā)育的滑動方向、地層巖性、地形坡度、相對高程及在斷裂不同位置的分布特征。結(jié)果顯示:(1)爐霍斷裂地震滑坡規(guī)模以小型為主;(2)集中于Ⅸ一X度烈度區(qū)內(nèi);(3)距震中0~5km及10~15km范圍內(nèi)密度最大;(4)滑動方向多與斷裂斜交,交角介于35?!?5。;(5)斷裂南東段滑坡數(shù)量多于北西段,北東盤多于南西盤,北西段的北東盤滑坡個體面積較大;(6)滑坡多發(fā)育于T.,r地層中;(7)主要分布于斜坡的中下部,相對高程主要介于30~60m;
3、(8)發(fā)育坡度多介于30?!?5。,具有規(guī)模越大,坡度越小的特點。關(guān)鍵詞鮮水河斷裂爐霍地震滑坡統(tǒng)計分析中圖分類號:P642.22文獻標(biāo)識碼:ASPATIALDISTRIBUTIoNANALYSIS0FSEISMICLANDSLIDESALoNGLUHUoSEGMENToFXLNSHUIHEFAULTZoNEWANGDonghuiTIANKai(ChengduCenter,ChinaGeologicalSurvey,Chengdu610081)AbstractMassivelandslidescanbeinduced
4、byearthquakebecauseofthestrongearthquakeactivityandfragilegeologicalenvironmentinLuhuosegmentoftheXianshuihefaultzone.179landslidesin1973and62landslidesbefore1973areobtainedthroughdatacollectionandgeologicalinvestigation.Thispaperisbasedonthe62landslidesbefore
5、1973and179landslidesin1973.ItmakesastatisticalanalysisofthecharacteristicparametersofLuhuoearthquake—triggeredlandslidesin1973andbefore.Sevencharacteristicparametersoftheseismiclandslidesareanalyzed.Theyareseismicintensity,epicentraldistance,slipdirection,form
6、ationlithology,slopeangle,height,distributioninNWpartandSEpart.Thisstudysupportsthefollowingviews.(1)Themostlandslideshaveasmallscale;(2)SeismicintensityzonesarebetweenIXandX;(3)Epicentraldistancebetween0kmto5kmand10kinto15kmarehigh—incidencezones;(4)Angleofsl
7、ipdirectionandfaultisbetween35。and75。;(5)LandslidesinSEpartofthefaultismorethanthoseinNWpart.TheNEfootofNWparthaslargerarea;(6)FormationlithologythathavethemostlandslidesisT2—3r;(7)Heightsarebetween30mto60m.Majoraredistributedinthelowerslope;(8)Slopeanglesareb
8、etween30。to45。.Thelargerlandslidesalwayshavelowerangles.KeywordsXianshuihefauhzone,Luhuo,Seismiclandslides,Statisticalanalysis收稿日期:2013—07—14;收到修改稿日期:2013—12—16.第一作者簡介:王東輝,男,碩士,工程師