昔格达断裂晚第四纪活动特征及强震复发周期  

Activity Characteristics on the Xigeda Fault in Late Quaternary and Recrudescing Interval of Strong Earthquake

作　　者：卢海峰[1,2] 姬志杰 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地震局地壳应力研究所,北京100085 [3]中国兵器工业北方勘察设计院,河北石家庄050021

出　　处：《现代地质》2011年第3期440-446,共7页Geoscience

基　　金：中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项(ZDJ2009-25)

摘　　要：利用冲沟、山脊等断错构造地貌的DEM影像资料和详实的野外踏勘,详细分析了昔格达断裂的晚第四纪活动特征。结果显示：断裂线两侧的河沟和山脊地貌呈＂S＂或反＂Z＂形或以多个首尾连接的＂S＂形雁列式斜列,断裂活动为左行左列式,断层上发育多个拉分盆地和断裂湖;该断裂最新活动时间晚于（12.83±1.09）ka,为全新世走滑活动断裂,倾滑分量不大,倾向总体西倾,且晚更新世以来的左旋走滑速率约为1.70 mm/a;依据断裂线地震遗迹及断裂活动特征,断裂强活动复发间隔大致为10~12 ka或更短。The paper studied the Late Quaternary activity of the Xigeda fault carefully based on the geomorphologic analysis of the landsat ETM data combined with field tectono-geomorphic observations and measurement.Results reveal that shape of the rivers and ridges along the fault showed the ＂S＂ or anti-＂Z＂,or more ＂S＂shape,which are end to end connected with each other,and an echelon oblique columns;the faulting way is sinistral strike slip with left step,and a series of pull-apart basins and fracture lakes（lake distributed popularly）developed;that as Holocene active strike-slip fault,its latest active time was later than（12.83±1.09） ka,generally,which is west dipping,with smaller（trend） strike-slip component and slip rates of 1.70 mm/a since late Pleistocene;that according to the seismic remnant and active characteristics of the fault,recrudescing interval of the fault activity is 10-12 ka or shorter.

关 键 词：全新世走滑活动断裂 拉分盆地 地震遗迹 复发间隔 昔格达断裂 

分 类 号：P542.3[天文地球—构造地质学]