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.
