| 银川盆地东缘黄河断裂第四纪活动与分段性研究 |
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| 关键词:Yinchuan Graben Yellow River fault Quaternary activity paleoseismic sequence |
| 基金项目:中国地质科学院基本科研业务费专项经费“贺兰山东麓山前断裂活动性调查研究与监测”(编号: YYWF201616);中国地质调查局地质调查项目“特殊地质地貌区填图试点”(编号: DD20160060) |
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| Quaternary Activity and Segmentation of the Yellow River Fault of the Eastern Margin of Yinchuan Graben |
| The Yinchuan Graben is located in the northern segment of the South-North Seismic Belt. It is a typical Cenozoic fault basin. It develops four major active faults: the Helan piedmont fault, the Luhuatai fault, the Yinchuan buried fault and the Yellow River fault from the west to the east. The largest earthquake recorded in the basin is the Pingluo M8.0 earthquake of 1739, and its seismogenic fault has been controversial. Recent studies suggested that the seismogenic fault may be the Yellow River fault, but there is no direct paleoseismic evidence. Based on the study of the geomorphological characteristics, geometric distribution, tectonic deformation sequence and seismic activity of the Yellow River fault, the authors hold that the Yellow River fault could be divided into Hongyazi section, Taole section, Binhe section and Lingwu section. The faults underwent an transformation from the early thrust deformation from east to west to the late westward dipping normal faults. The tectonic stress field changed from NW–SE compression to nearly EW extension, and the transformation time was the end of late Pleistocene. According to the activity analysis of different locations of the fault, the Yellow River fault experienced at least 5 paleoseismic events during the Late Pleistocene–Holocene period, and the interval of seismicity was about 3 000 years. The latest activity time of the Binhe section was 4 000 years ago, and the latest activity of the Taole section occurred later than (330±30) a BP, it is of great significance to study the seismogenic faults of the Pingluo M8.0 earthquake of 1739. |
| BAO Guo-dong,CHEN Hong,HU Jian-min,ZHU Gui-fan.2019.Quaternary Activity and Segmentation of the Yellow River Fault of the Eastern Margin of Yinchuan Graben[J].Acta Geoscientica Sinica,40(4):614-628. |
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