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时间:2020-03-25
《汶川地震地质灾害后效应分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004—9665/2011/19(2)一0145—07谨以本文纪念汶川地震三周年,向地震中遇难的逝者致以深切的哀思汶川地震地质灾害后效应分析木黄润秋(地质灾害防治与地质环境保护国家重点实验室(成都理工大学)成都610059)摘要汶川地震过去3a了。3a来,大量的国内外学者对地震灾区地震地质灾害的发育分布规律、形成机理及防治对策给予了高度关注,发表了大量的研究成果。人们在关注同震地质灾害的同时,更对地震灾区今后地质灾害的发生规律及演化趋势、持续时间倾注了极大的关心,因为震后连续3a,尤其是2010年,灾区地质灾害的
2、频率和规模均出现较震前显著增大的现象。本文收集整理了震前和震后灾区地质灾害的数据资料,尤其研究了震后3a灾区重大地质灾害的特点和发生规律,在此基础上,分析了震后灾区地质灾害可能的持续时间、演化趋势以及高风险区的范围。分析和研究结果认为,震后汶川地震灾区的地质灾害将持续20~25a;在这段时间内,地质灾害将以4—5a一个高峰为周期,呈震荡式的衰减下降,并最终恢复到震前的水平。震后地质灾害的高风险区将出现在耿达一映秀、小鱼洞、红白一茶坪、擂鼓一陈家坝和青川东河口一窝前这5个地段上。关键词后效应汶川地震地质灾害活动性发展趋势中图分类号:P642.2;TU43文献标识码:AAFTEREF
3、FECToFGEoHAZARDSINDUCEDBYTHEWENCHUANEARTHQUAKEHUANGRunqiu(StatekeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection,ChengduUniversityofTechnology,Chengdu610059)AbstractItwas3yearssincetheWenchuanearthquake.Alotofdomesticandforeignscholarshaveconductedagreatdealofworkonthedevelopmenta
4、nddistributionpatterns,formationmechanismsandpreventionstrategiesofthegeohazardstriggeredbytheWenchuanearthquake,andhavepublishedalotofresearchresults.Sincethefre—quencyandscaleofincreasedmarkedly,especiallyin2010,manyresearchersarebeginningtopaycloseattentiontotheoccurrencerules,activitytren
5、dsanddurationofgeohazardstriggeredbyrainfallsafte'rtheWenchuanearth-quake.Thispapercollectedthedatapre—andpost—earthquake,andanalyzedthecharacteristicsandoccurrencerulesofmajorgeohazardstriggeredbyrainfallsinthelast3yearsintheWenchuanea~hquakearea.Basedonthis,thedu-ration,activitytrendsandhig
6、hriskareasofgeohzardsintheWenchuanea~hquakeareaswereanalyzed.Theprelim—inarystudyresultsindicategeohazardactivityintheWenchuanerathquakeareawillkeepstillintenseinfuture20-25years.Inthisperiodoftime,geohazardactivitylevelappearedtodeclineinshockwiththecycleofeveryfourorfiveyears.Afterthat,theg
7、eologicalconditionwillbegraduallystable.ThehighgeohazardsriskareaswillbemainlydistributedalongtheYingxiu—Beichuanfault,especiallyinthesectionsofGenda—YingxiuinWenchuancounty,Xi—aoyudonginPengzhoucounty,Hongbai,Shifangcounty—Chaping,Anxiancoun
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