沈阳—抚顺地区潜在地震灾害的危险性分析
|
摘要
沈阳—抚顺地区位于下辽河断陷的北东缘，是郯庐断裂系（ＴＬＳ）北段主要分支的交会点和重要弯曲转折点；活动断裂弯曲转折部位、交叉部位都可能形成“粘滑闭锁段”，与地震特别是大地震的发生直接相关；同时许多大地震也和断陷盆地区的低位高角度断层（兼具有走滑性质）有关。ＴＬＳ现代的右行走滑特征及沈阳—抚顺地区所处的构造位置均反映该地区是强大地震（７级以上）的潜在发生区；强震一旦发生将造成巨大损失，潜在隐患十分巨大。应加强潜在地震的预测、预报研究。
Shenyang-Fushun area is a potential area where probably can occur strong earthquakes.The reasons are in the following. 1.Shenyang-Fushun area locates in Tan-Lu fault system(TLS),TLS is an active fault system in China,where several strong earthquakes have happened,such as Tangshan earthquake(1976),Haicheng earthquake(1975), Bohai bay earthquake(1922,1969),which have cause tremendous losses. 2.Shenyang-Fushun area locates at the crossing point of the main branches and at a turning points of the northern Tan-Lu Fault system(TLS).A great deal of fact has proven that the region of crossing point and/or turning point of an active fault has close relationships with earthquakes, esp. strong earthquakes. 3.The slip rate in TLS is 0.6～0.024 mm/a,largely lower than that in Sandness Fault(25 mm/a) in the U.S.A. It is related with its evolution history: in Mesozoic, the TLS is sinistral strike slipping, while in Cenozoic, it is dextral strike slipping,therefore the Mesozoic tectonic frame restrictly resists the dextral strike slipping of the fault system in Cenozoic and at present,and largely lowers its slip rate. So,tremendous stress has been concentrated and probably will be relieved in a form of strong earthquakes. 4.Shenyang-Fushun area locates in the northeastern part of the Lower Liaohe Depression.Many strong earthquakes have occurred in high angle faults with strike slip character in fault basins. The characteristics of TLS and the tectonic location of Shenyang-Fushun area show that Shenyang-Fushun area is a potential area of strong earthquakes.If a strong earthquake happens,it would cause huge losses. Therefore,it is very necessary and essential to strengthen the studies on the potentiality,prediction and forecasting of strong earthquakes in the area.
Shenyang-Fushun area is a potential area where probably can occur strong earthquakes.The reasons are in the following. 1.Shenyang-Fushun area locates in Tan-Lu fault system(TLS),TLS is an active fault system in China,where several strong earthquakes have happened,such as Tangshan earthquake(1976),Haicheng earthquake(1975), Bohai bay earthquake(1922,1969),which have cause tremendous losses. 2.Shenyang-Fushun area locates at the crossing point of the main branches and at a turning points of the northern Tan-Lu Fault system(TLS).A great deal of fact has proven that the region of crossing point and/or turning point of an active fault has close relationships with earthquakes, esp. strong earthquakes. 3.The slip rate in TLS is 0.6～0.024 mm/a,largely lower than that in Sandness Fault(25 mm/a) in the U.S.A. It is related with its evolution history: in Mesozoic, the TLS is sinistral strike slipping, while in Cenozoic, it is dextral strike slipping,therefore the Mesozoic tectonic frame restrictly resists the dextral strike slipping of the fault system in Cenozoic and at present,and largely lowers its slip rate. So,tremendous stress has been concentrated and probably will be relieved in a form of strong earthquakes. 4.Shenyang-Fushun area locates in the northeastern part of the Lower Liaohe Depression.Many strong earthquakes have occurred in high angle faults with strike slip character in fault basins. The characteristics of TLS and the tectonic location of Shenyang-Fushun area show that Shenyang-Fushun area is a potential area of strong earthquakes.If a strong earthquake happens,it would cause huge losses. Therefore,it is very necessary and essential to strengthen the studies on the potentiality,prediction and forecasting of strong earthquakes in the area.
引文
1］徐嘉炜，马国峰．郯—庐断裂研究的十年回顾［J］．地质论评，1992，（4）：316～324．［2］国家地震局地质研究所．郯—庐断裂［M］．北京：地质出版社，1987．［3］AnYin，etal．AnIndentationModelfortheNorthandSouthChinaColisionandDevelopmentoftheTan－LuandHonamfaultsystems［J］．EasternAsiaTectonics，1993，12（4）：801～813．［4］张宏．郯—庐断裂系北延地质特征及其中生代演化史［J］．地质矿产部沈阳地质矿产研究所集刊．1995，（4）：49～80．［5］薄万举，杨国华．郯—庐断裂带地壳活动新特征［J］．东北地震研究，1996，12（4）：1～10．［6］张裕明，周本刚．中国潜在震源区的划分问题［A］．见：李茂松主编．北京大学国际地质科学学术研讨会论文集［C］．北京：地震出版社，1998．189～198．［7］汪一鹏，马杏垣．中国活动构造基本特征［A］．见：李茂松主编．北京大学国际地质科学学术研讨会论文集［C］．北京：地震出版社，1998．199～204．［8］刘志平，董瑞树．依兰－伊通断裂分段及地震危险性探讨［J］．东北地震研究，1995，18（4）：12～18．［9］李荣安，徐平．海城地震地区地壳三维结构特征［J］．地震地质，1997，19（1）：9～13．［10］卢良平，李平．海城7．3级地震震源环境的力学分析［J］．地震地质，1997，19（2）：141～147．［11］赵俊猛，卢造勋．辽河裂谷的深部构造与裂谷活动的侧向迁移［J］．地震地质，1998，20（3）：225～232．［12］侯建军，梁海华，郑文涛，等．活动断裂研究的几个基本问题［A］．见：李茂松主编．北京大学国际地质科学学术研讨会论文集［C］．北京：地震出版社，1998．205～211．［13］李建华，郝书俭．1976年唐山地震的活动性研究［J］．地震地质，1998，20（1）：27～33．［14］WenXZ．RecentSlipRates，EarthquakeRecurenceIntervalandStrongSeismicHazardsontheNortheasternSegmentoftheXianshuiheFaultZone［J］．EarthquakeResearchinChina，1998，2（4）：431～451．［15］强祖基，孔令昌，李玲芝，等．地震与卫星热红外异常—气热说［A］．见：李茂松主编．北京大学国际地质科学学术研讨会论文集［C］．北京：地震出版社，1998．176～188．
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心