Quaternary activity and seismic hazard of Liangyun fault in northwestern Hubei area
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摘要: 两郧断裂带是鄂西北地区规模最大、影响最强的断裂之一，位于秦岭断块隆起区，长约200 km，走滑运动性质，第四纪分段活动特征明显，曾于1964年发生过郧西4.9级地震。此前对该断裂郧西段的第四纪活动研究较少，直接影响着对鄂西北地区活动构造变形格局和强震危险性的整体认识和评估。本文基于遥感解译、野外地质调查和高密度电法勘探研究，发现断裂沿线发育有串珠状盆地、负向断层长谷、断层垭口和断层崖等构造地貌形态。两陨断裂在早第四纪活动明显，晚第四纪以来活动微弱，滑动速率低，未来中强地震的危险性不容低估。Abstract: The Liangyun fault zone, as one of the largest and most influential faults in the northwestern Hubei area, is located in the uplifted area of Qinling fault block with a length of about 200 km. The structure has a sinistral strike-slip motion with obvious quaternary activities. The Yunxi M4.9 earthquake which occurred in 1964 may be resulted from the reactivation of the Liangyuan fault. However, the Quaternary activity of the fault is poorly studied, which affects the overall understanding of the neotectonic deformation pattern and strong earthquake risk in the northwestern Hubei area. Based on remote sensing interpretation, field investigation, and high-density electrical exploration, it was found that bead-like basins, negative fault long valleys, fault passes, fault scarps, and other morphological features are developed along the fault trace. The fault activity is obvious in the early and middle Quaternary sediments. The risk of moderate earthquake in the future should not be underestimated, although its activity in the late Quaternary is weak.
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Key words:
- Liangyun fault zone /
- Quaternary activity /
- seismic hazard
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图 2 两郧断裂郧西段地震构造图（红线代表两郧断裂带）
Figure 2. Seismic structure of Liangyun fault in Yunxi county (red lines represent the fault)
图 4 郧西县土门镇水库附近断裂活动特征图（红色箭头指示断层位置）
Figure 4. Diagram of fault activity near Tumen town reservoir (red arrows indicate fault)
图 5 郧西县黄石粱村附近断裂活动特征图（红色箭头指示断层位置）
Figure 5. Diagram of fault activity near Huangshiliang village (red arrows indicate fault)
图 6 郧西县王家台子村附近断裂活动特征图(红色箭头指示断层位置)
Figure 6. Diagram of fault activity near Wangjiataizi village (red arrows indicate fault)
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