鄂尔多斯块体周边正倾滑活动断裂历史强震地表破裂分段

SEGMENTATIONS OF ACTIVE NORMAL DIP-SLIP FAULTS AROUND ORDOS BLOCK ACCORDING TO THEIR SURFACE RUPTURES IN HISTORICAL STRONG EARTHQUAKES

在近年活动断裂研究成果基础之上 ,分析了鄂尔多斯地块周边断陷系 9次历史强震破裂的分段与活动构造之间的关系 .结果表明 ,在个别具有较大不确定性参数不参加统计情况下 ,这些强震地表破裂参数与活动构造之间表现出较好的相关性 ,反映出强震的破裂强度及地表破裂的分段与活动构造之间的内在联系 .同时 ,这些强震表现出特征型强震的稳定和非稳定的地表破裂边界 ,以及同一构造单元不同边界断裂存在的强震连续发生现象 .

WT5BZ]From the results of researches of active faults in resent years, a correlation analysis between segments of the faults according to surface ruptures in nine historical strong earthquakes occurring in downfaulted system and active structures around Ordos Block is conducted. The result shows that there is a good correlation between them, except few individual data that have more uncertain parameters. It shows that intensity and segments of surface ruptures in these strong earthquakes are intrinsically related with the active structures. These strong earthquakes produced stable and unstable rupture boundaries of characteristic earthquake type and successive occurrence of strong earthquakes on the different boundary faults in the same tectonic unit.