【摘要】 介绍了应用雷达卫星影像对四川龙门山活动断裂开展断错地貌判读结果,展示了龙门山构造带4条分支断裂9个点位的雷达卫星影像图像、11个点位的野外调查结果及6个点位与断层活动性有关的地层测年。在11个野外调查点位中,位于青城山北面4条断裂8个点位均出现2008年5.12汶川Ms8.0地震的地表破裂,其中包括沿青川断裂青溪段及金山寺断层沟谷出现的两条地表破裂,沿后山断裂带茂县北断层和汶川南七盘沟断层出现的地表破裂;沿中央断裂带北川和小鱼洞南2个点位出现的地表破裂;以及沿前山断裂汉旺台地前缘和青城山山前地表破裂点位。在这些地表破裂中,中央断裂带地表垂直位移为2～6m,青川断裂、后山断裂和前山断裂多数段地表断错垂直位移量为10～40cm。后者位移量虽小,也不应被忽视。本项研究结果表明,雷达卫星影像显示青川断裂与后山断裂带和中央断裂带右旋走滑明显。雷达卫星影像实地调查表明,前山断裂带南段的水口场-横山庙断裂带醒目的断错地貌引人注目。更多还原

【Abstract】 SAR satellite images of the Longmenshan active faults zone in Sichuan Province are used to interprete the dislocated landform.SAR satellite images of 9 sites in 4 branch faults of the Longmenshan tectonic zone,field investigation results at 11 sites,and stratigraphic dating of 6 sites are analyzed for understanding fault activity. Among the 11 field investigation sites,8 in 4 faults located in the north of Qingcheng Mountain all show surface rupture zone of Wenchuan Ms8.0 Earthquake on 12 May,2008.They include two surface ruptures along the Qingxi segment and the Jinshansi fault trenches of the Qingchuan fault,the ruptures at the Maoxian north fault and the Qipangou fault south to Wenchuan along the Mountain Back fault zone,the ruptures along Beichuan and Xiaoyudong south of the Central fault zone,and the ruptures in front of the Hanwang platform and piedmont of Qingcheng Mountain of the Mountain Front fault.In these surface ruptures,the vertical displacement of the Central fault zone is 2 ～6m,while those of most segments in Qingchuan fault,the Mountain Back fault and the Mountain Front Fault are 10 ～ 40cm.The latter displacements,though small,should not be ignored.The Qingchuan fault,the Mountain Back fault,and the Central fault with dextral strike-slip appear clearly in SAR satellite images.Field investigation show that the dislocated landform of the Shuikouchang-Hengshanmiao fault in the southern part of the Mountain Front fault is noticeable.更多还原