公元前47年甘肃陇西地震考证与发震构造分析

发布时间：2018-02-24 19:21

  本文关键词： 公元前年陇西地震 历史地震考证 宺道城 发震构造 西秦岭北缘断裂带　出处：《地震地质》2017年04期 　论文类型：期刊论文

【摘要】：西汉元帝初元二年二月戊午,即公元前47年4月17日,在陇西郡所属的宺道县附近发生了1次强烈地震,造成"坏败宺道县城郭、官寺及民室屋,压杀人众。山崩地裂,水泉涌出"等严重震害。根据历史资料考证和野外实地调查,确认宺道县城在今甘肃省陇西县文峰镇东南的三台王家新庄附近。宺道城是这次地震史料记载中破坏最严重的地方,理应位于极震区内,其烈度达Ⅸ—Ⅹ度,估算其震级达7级左右。结合其他破坏点烈度的综合评定结果,绘制了这次地震的等震线图,其长轴方向为NWW向。这次地震极震区位置和等震线长轴方向与该区的西秦岭北缘断裂带的甘谷—武山断裂段西段相吻合。该段断裂全新世晚期新活动的地质地貌和地质剖面证据明确,以左旋走滑为主兼具向N倾的正断特性,断错了冲沟T_1—T_2级冲洪积阶地,沿断裂至今仍保留有部分深切的地震断层沟槽、黄土中密集发育的张性构造裂缝、滑坡体和串珠状落水洞等地表形变现象遗迹。结合该区现代小震活动精定位结果的综合分析,认为公元前47年陇西地震应为西秦岭北缘断裂带的甘谷—武山断裂段西段新活动的结果。该断裂具备发生7级以上地震的构造条件。
[Abstract]:On February, February, on April 17th, 47 BC, a strong earthquake occurred near the county belonging to Longxi County, Guidao County, where the Emperor of the Western Han Dynasty was the Emperor of the early Yuan Dynasty. The earthquake caused "the city Guo, the official temple and the houses of the people's rooms to destroy and kill people," resulting in the collapse of the landslide. Serious earthquake damage, such as flooding of water springs. According to historical data, textual research and field investigations, Confirming that the county seat of Gudao is near Santai Wangjiaxinzhuang, southeast of Wenfeng Town, Longxi County, Gansu Province. The city of Tendao is the most seriously damaged place in the historical records of the earthquake, and it should be located in the extremely earthquake area, the intensity of which is in the range of IX-鈪，

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