Analysis of the causative fault of the M~7 earthquake in the northeast part of Xi'an, China in the year 1568
Analysis of the causative fault of the M~7 earthquake in the northeast part of Xi'an, China in the year 1568
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1568年西安东北部7级地震的震源断层分析
DOI：
10.1016/j.ijdrr.2019.101415
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发表时间：
2020
影响因子：
5
通讯作者：
Feng X
中科院分区：
文献类型：
--
作者：
Feng X
渭南-泾阳断裂是渭河盆地固始次级坳陷南部边界断裂之一。地球物理勘探工作和实地地质调查表明，该断层系统的长度约为105公里，并延伸到地下至少5公里，向北倾斜，深度较浅。在断裂带长期位移的影响下，断裂带内断层北侧地层向南倾斜，固始坳陷沉降中心不断南移。渭南-泾阳断裂新生代的活动导致了断裂两侧古生界和新生界地层的明显错动。该断层在第四纪，特别是晚第四纪一直活动，在某些地方抵消了明朝（1368-1644 CE）形成的地层，这表明该断层可以可靠地被认为是在全新世时期活动。通过对历史地震记录的全面重新审视，结合野外考察，证实渭南-泾阳断裂可能是公元1568年西安东北部7级大地震中发生滑动的断裂。这次地震在这里被重新命名为陕西高陵地震。
The Weinan-Jingyang fault is one of the southern boundary faults of the Gushi secondary depression of the Weihe Basin, China. Geophysical exploration work and field geological surveys have demonstrated that this fault system has a length of approximately 105 km, and extends at least 5 km into the subsurface, with a northerly dip that shallows with depth. Under the influence of long-term displacement on the fault zone, the strata on the north side of the fault within the fault zone dip to the south, and the subsidence centre of the Gushi depression has migrated continuously southward. The Cenozoic activity of the Weinan-Jingyang fault has resulted in a significant dislocation between Paleozoic and Cenozoic strata on either side of the fault. This fault has been active during the Quaternary, especially the late Quaternary, in some places offsetting strata formed during the Ming Dynasty(1368–1644 CE), suggesting that this fault can reliably be regarded being active during Holocene time. Comprehensive re-examination of historical earthquake records, combined with field studies, confirm that the Weinan-Jingyang fault is likely the fault that slipped during a magnitude ~7 earthquake in northeast Xi'an, China in 1568 CE. That earthquake is here re-named the Shaanxi Gaoling Earthquake.