| Paleoseismic activity on Wujiahe segment of Serteng piedmont fault,inner Mongolia |
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| 作者姓名： | 杨晓平 冉勇康 胡博 郭文生 |
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| 作者单位： | [1]InstituteofGeology,ChinaSeismologicalBureau,Beijing100029,China [2]SeismologicalBureauofInnerMongoliaAutonomousRegion,Hohhot010050,China |
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| 基金项目： | State Key Basic Research Development and Programming Project Mechanism and Prediction of Continental Strong Earthquakes (G199804070) and Joint Earthquake Science Foundation of China (100068). |
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| 摘 要： | Geomorphic study on Wjiahe segment of Serteng piedmont fault,Inner Mongolia is made.Throuth analysis of the available data in combination with the results of predecessors‘studies it can be obtained that average vertical displacement rate is 0.48-0.75mm/a along the Wujiahe segment since the late Pleistocene(14.450-22.340ka BP)and 0.56-0.88mm/s since the early-middle Holocene(5.570-8.830ka BP).Analyzing paleoseismic phenomena revealed in the excavated 5trenches in combination with the results of predecessors‘studies of paleoearthquakes on the fault,we determine five paleoseismic events on the Wujiahe segment of Serteng piedmont fault since 27.0ka BP and the recurrence interval to be about 4.300-4.400ka,A cluster of paleoearthquakes occurred probably during 8.000-9.000ka BP and two paleoeismic events in 10.000-20.000ka BP may be missed.A comparison between height of fault scarps and sum of displacement caused by paleoseismic events revealed in trenches,and recurrence interval of paleoseismic events obtained from average displacement rate along the fault and the disloca-tion by one event suggest that three paleoseismic events are absent in Alagaitu trench.Two paleoseismic events may be absent on the whole active fault segment.
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| 关 键 词： | 古地震活动 内蒙古 山前断裂带 断裂活动 活动速率 |
| 收稿时间： | 4 January 2002 |
| 修稿时间： | 23 July 2002 |
Paleoseismic activity on Wujiahe segment of Serteng piedmont fault, Inner Mongolia |
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| Yang Xiao-ping , Ran Yong-kang , Hu Bo and Guo Wen-sheng.Paleoseismic activity on Wujiahe segment of Serteng piedmont fault,inner Mongolia[J].Acta Seismologica Sinica(English Edition),2003,16(1):67-78. |
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| Authors: | Yang Xiao-ping Ran Yong-kang Hu Bo and Guo Wen-sheng |
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| Institution: | 1. Institute of Geology, China Seismological Bureau, Beijing 100029, China
2. Seismological Bureau of Inner Mongolia Autonomous Region, Hohhot 010050, China |
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| Abstract: | Geomorphic study on Wujiahe segment of Serteng piedmont fault, Inner Mongolia is made. Through analysis of the available data in combination with the results of predecessors studies it can be obtained that average vertical displacement rate is 0.48~0.75 mm/a along the Wujiahe segment since the late Pleistocene (14.450~22.340 ka BP) and 0.56~0.88 mm/a since the early-middle Holocene (5.570~8.830 ka BP). Analyzing paleoseismic phenomena revealed in the excavated 5 trenches in combination with the results of predecessors studies of paleoearthquakes on the fault, we determine five paleoseismic events on the Wujiahe segment of Serteng piedmont fault since 27.0 ka BP and the recurrence interval to be about 4.300~4.400 ka. A cluster of paleoearthquakes occurred probably during 8.000~9.000 ka BP and two paleoseismic events in 10.000~20.000 ka BP may be missed. A comparison between height of fault scarps and sum of displacement caused by paleoseismic events revealed in trenches, and recurrence interval of paleoseismic events obtained from average displacement rate along the fault and the disloca-tion by one event suggest that three paleoseismic events are absent in Alagaitu trench. Two paleoseismic events may be absent on the whole active fault segment. |
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| Keywords: | Serteng piedmont fault fault movement paleoearthquake recurrence interval |
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