甘肃酒西盆地发现地震地表破裂带

发布时间：2018-04-18 03:01

本文选题：地震破裂带 + 酒西盆地　；参考：《地震地质》2016年03期

【摘要】：根据航、卫片解译和野外实地考察,在位于祁连山—河西走廊西段的酒西盆地白杨河背斜北发现1条较新的地震破裂带遗迹,破裂带长度约5km,呈弧形展布,保存较为完整,在最新的洪积扇面上陡坎高度约0.5~0.7m,在冲沟T1阶地上陡坎高度约1.5m,分析认为其为较新的1次地震活动所致。沿断层陡坎探槽开挖表明,此次破裂带形成于约1500aBP,此前断裂还有过活动。根据该地区历史地震资料考证和研究程度,认为该地震地表破裂带可能与365年玉门地震、1785年玉门惠回堡地震或1次漏记的历史强地震有关。
[Abstract]:According to navigation, satellite interpretation and field investigation, a relatively new earthquake rupture zone was found in the northern part of the Baiyang River anticline in the western section of the Qilian Mountains and Hexi Corridor, with a length of about 5 km, which is distributed in an arc and is relatively intact.The height of steep ridges is about 0.5 ~ 0.7m on the latest alluvial fan plane and 1.5 m on the ground of T _ 1 step of the gully. It is considered that it is caused by a relatively new earthquake activity.The trench excavation along the fault scarp indicates that the fracture zone was formed at about 1500 ABP, after the fault was still active.Based on the historical seismic data in this area, it is considered that the surface rupture zone of the earthquake may be related to the Yumen earthquake of 365 years, the Huibao earthquake of 1785 or the historical strong earthquake with a missing record.
【作者单位】：中国地震局兰州地震研究所;兰州地球物理国家野外科学观测研究站;
【基金】：国家自然科学基金(41402186) 中国地震局地震行业科研专项(201408023)共同资助
【分类号】：P315.2

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