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Analysis of Paleoseismic Events of Dahuzhuang Trench at the Xiadian Fault
DENG Mei1, SHEN Jun1, LI Xi2, DAI Xunye1, LIU Zezhong1, LI Kechang1, JIAO Xuankai1
1.Institute of Disaster Prevention, Sanhe 065201, Hebei, China;2.Yunnan Earthquake Agency, Kunming 650224, China
摘要:
The Xiadian Fault is a very important concealed active fault in the Beijing Plain. It is the seismogenic fault of the Sanhe-Pinggu MS8.0 earthquake in 1679. The ancient earthquake sequence in the long historical period is of great significance to understand accurately the activity characteristics of the fault and effectively reduce the earthquake disaster risk in Beijing. We have re-interpreted the Dahuzhuang trench, and identified three layers of buried paleosol, six collapsed wedges and one sand liquefaction event. Further, through the comparison with the landmark strata and paleo-earthquake events revealed by other trenches on the fault, an ancient earthquake sequence with a long historical period of the Xiadian Fault was established:since the 31ka, the Xiadian Fault has 11 occurrences of earthquake events (including the 1679 earthquake), and the average recurrence interval is about 2.8ka. The paleo-seismic sequence also shows that there is an ancient earthquake cluster period from 25ka to 15ka, and there are 5 strong earthquakes in the cluster period. The average recurrence interval is about 2.0ka, which reflects the phase difference of the Xiadian Fault activity.
关键词:  The Xiadian Fault  Paleaoearthquake event  Collapse wedge  Sand liquefaction  Symbol layer
DOI:10.19743/j.cnki.0891-4176.201903005
分类号:
基金项目:This project was sponsored by the Teaching Reform Project in Hebei Province(2017GJJG257),the National Natural Science Foundation of China(41372216) and Top-quality Course Project of College of Disaster Prevention Science and Technology(JPJS2018006).
Analysis of Paleoseismic Events of Dahuzhuang Trench at the Xiadian Fault
DENG Mei1, SHEN Jun1, LI Xi2, DAI Xunye1, LIU Zezhong1, LI Kechang1, JIAO Xuankai1
1.Institute of Disaster Prevention, Sanhe 065201, Hebei, China;2.Yunnan Earthquake Agency, Kunming 650224, China
Abstract:
The Xiadian Fault is a very important concealed active fault in the Beijing Plain. It is the seismogenic fault of the Sanhe-Pinggu MS8.0 earthquake in 1679. The ancient earthquake sequence in the long historical period is of great significance to understand accurately the activity characteristics of the fault and effectively reduce the earthquake disaster risk in Beijing. We have re-interpreted the Dahuzhuang trench, and identified three layers of buried paleosol, six collapsed wedges and one sand liquefaction event. Further, through the comparison with the landmark strata and paleo-earthquake events revealed by other trenches on the fault, an ancient earthquake sequence with a long historical period of the Xiadian Fault was established:since the 31ka, the Xiadian Fault has 11 occurrences of earthquake events (including the 1679 earthquake), and the average recurrence interval is about 2.8ka. The paleo-seismic sequence also shows that there is an ancient earthquake cluster period from 25ka to 15ka, and there are 5 strong earthquakes in the cluster period. The average recurrence interval is about 2.0ka, which reflects the phase difference of the Xiadian Fault activity.
Key words:  The Xiadian Fault  Paleaoearthquake event  Collapse wedge  Sand liquefaction  Symbol layer