安徽地区历史及现代地震活动与断裂活动性关系研究
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摘要
安徽地区处于华北板块与扬子板块沿着大别造山带的陆-陆碰撞变形带,构造背景复杂多样,断裂十分发育。郯庐断裂带长期控制着两侧的构造格局,大别山东缘的霍山地区多条断裂在晚第四纪有新活动。史料记载表明安徽地区历史地震以中强震为主,最高震级为M614级。根据区域地震地质、历史地震近年最新研究成果,对第四纪特别是晚第四纪以来的断裂活动习性做出归纳和分类,并分析历史地震、1970年后有仪器记载以来中等强度地震和小地震密集与断裂活动的相关性,为中长期地震预测提供依据。
Located in continent-continent collision between the North China tectonic block and Yangtze tectonic block,the Anhui area formed a deformation belt along the Dabie orogenic belt.The tectonic background of this area is complicated and diversified and fault tectonics of it is fully developed.The Tan-Lu fault zone controls the tectonic pattern of both sides for a long time;there are many faults in Huoshan area on the eastern margin of Dabie Mountains have activities in the late Quaternary.Historical earthquake records show that most historical earthquakes in Anhui area are medium-strong earthquakes,the largest magnitude of them is M614.According to the latest research on regional seismogeology and historic earthquakes in recent years,this paper sums up and classifies the fracture activity characteristics since the Quaternary Period,especially since the late Quaternary period.The results indicate that the historical earthquakes, medium-sized intensity earthquakes and seismic dense zone of little earthquakes since the beginning of instrumental records in 1970 are the relevance of the fault tectonics activity.
Located in continent-continent collision between the North China tectonic block and Yangtze tectonic block,the Anhui area formed a deformation belt along the Dabie orogenic belt.The tectonic background of this area is complicated and diversified and fault tectonics of it is fully developed.The Tan-Lu fault zone controls the tectonic pattern of both sides for a long time;there are many faults in Huoshan area on the eastern margin of Dabie Mountains have activities in the late Quaternary.Historical earthquake records show that most historical earthquakes in Anhui area are medium-strong earthquakes,the largest magnitude of them is M614.According to the latest research on regional seismogeology and historic earthquakes in recent years,this paper sums up and classifies the fracture activity characteristics since the Quaternary Period,especially since the late Quaternary period.The results indicate that the historical earthquakes, medium-sized intensity earthquakes and seismic dense zone of little earthquakes since the beginning of instrumental records in 1970 are the relevance of the fault tectonics activity.
引文
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[2]安徽省地质调查院.安徽省1∶50万系列地质图说明书[R].2005.12.
[3]邓起东,闻学泽.活动构造研究—历史、进展与建议[J].地震地质,2008,30(1):1-30.
[4]邓起东,张培震,冉永康,等.中国活动构造与地震活动[J].地学前缘,2003(1):66-73.
[5]姚大全,刘加灿,李杰,等.六安-霍山地震危险区地震活动和地震构造[J].地震地质,2003,25(2):211-219.
[6]姚大全,张杰,沈小七.安徽霍山地区断层活动习性研究的新进展[J].地球物理学进展,2006,21(9):776-782.
[7]姚大全,汤有标,刘加灿,等.大别山东北部基岩区断裂活动习性的综合研究[J].地震地质,1999,21(1):63-68.
[8]李起彤.郯庐断裂带江苏段全新世活动新证据[M].北京:地震出版社,1994:140-145.
[9]姚大全,刘加灿,李杰,等.新沂-泗县地震危险区地震活动和地震构造[J].华北地震科学,2003,21(2):23-28.
[10]张杰,姚大全,刘东旺,等.安徽及邻区中长期地震危险区的预测研究[J].地震地磁观测与研究,2006,27(3):29-39.
[11]姚大全,刘加灿,翟洪涛,等.地震韵律研究方法初探—以郯庐断裂带龙泉山西麓剖面研究为例[J].地震研究,2005,28(1):49-52.
[12]中国地震局地质研究所,安徽省地震工程研究院,中国地震灾害防预中心.安徽芜湖核电站芭芽山厂址可行性研究阶段地震安全性评价报告[R].2007.
[13]胡连英,徐学思.江苏溧阳地震孕育和发生的地质因素剖析[J].江苏地质,2001,25(1):11-16.
[14]顾功叙,林庭煌,时振梁,等.中国地震目录[M].北京:科学出版社,1983.
[15]安徽省地震局.安徽地震目录[M].北京:中国展望出版社,1990.
[16]刘昌森,景天永,孙庆煊,等.苏.浙.皖.沪地震目录(公元225~2000年)[M].北京:地震出版社,2002.
[17]Sondergeld C.H.,Estey L.H.,Acoustic emission study of microfracturing during the cyclic loading of westerly granite[J].J.Geophys.Res.,1981,86(B4):2 915-2 924.
[18]王健.渤海海域历史地震和海啸[J].地震学报,2007,29(5):549-557.
[19]李善邦,武宦英,郭增建,等.中国地震目录[M].北京:科学出版社,1960.
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