浑河断裂地球物理场特征及地震活动性

Geophysical field characteristics and seismicity of Hunhe fault

浑河断裂是辽宁省内一条重要的北东向地震构造带,断裂两侧的地球物理重磁场存在差异。通过浑河断裂的区域重力场与磁场研究,认为浑河断裂既控制了深、浅部岩石地层的发育,同时浑河断裂的重力场、磁场分布随着深、浅部地层岩性发育的差异而有所变化。浑河断裂的重力场和磁场梯度带主要位于抚顺以西至沈阳一带,浑河断裂历史以来有记录的最大破坏性地震位于重力梯度变化较大的沈阳段。综合浑河断裂地球物理场特征及区域地质资料,浑河断裂虽然活动性一般,但抚顺地区的采煤活动对断裂的活动性有一定影响。近些年抚顺地区频发的沉降、滑坡和地裂缝等地质灾害应当引起对浑河断裂活动性研究的重视。

Hunhe fault is an important northeast-trending seismotectonic belt in Liaoning Province,of which the geophysical gravity and magnetic field of the two sides are different.Based on the research of the regional gravity and magnetic field of Hunhe fault,it is concluded that Hunhe fault controls the development of deep and shallow lithostratigraphy,and the gravity and magnetic field changes with the difference of the lithologic development.Its gravity and magnetic field are mainly located in the west of Fushun to Shenyang,the most destructive earthquake recorded in the history of Hunhe fault occurred in Shenyang section where the gravity gradient varies greatly.The Hunhe fault is generally not very active according to its geophysical field characteristics and regional geological data,but the coal mining activities in Fushun have certain impact on the fault activity.There have been frequent subsidence,landslide,ground crack and other geological disasters in Fushun area in recent years,more attention should be paid to the study on the activity of Hunhe fault.