| 岷江断裂羌阳桥一带古堰塞湖沉积及构造变形与古地震 |
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| 引用本文： | 安卫平,赵晋泉,闫小兵,李自红,苏宗正.岷江断裂羌阳桥一带古堰塞湖沉积及构造变形与古地震[J].地震地质,2008,30(4):980-988. |
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| 作者姓名： | 安卫平 赵晋泉 闫小兵 李自红 苏宗正 |
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| 作者单位： | 山西省地震局,太原,030002 |
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| 基金项目： | 中国地震局汶川8.0地震应急科学考察项目资助 |
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| 摘 要： | 在支援茂县汶川地震灾后恢复重建期间,发现在现今叠溪堰塞湖(小海子)上游30km的岷江沿岸及其支流断续有第四纪湖相层出露。通过对羌阳村一带古堰塞湖沉积层的研究,获得了岷江断裂全新世活动的证据。分析认为:岷江断裂沿线古堰塞湖相沉积及其构造变形反映了岷江断裂的多次活动。羌阳桥古堰塞湖沉积及其构造变形可能反映岷江断裂的多次古地震活动。较肯定的是:第1次地震活动导致羌阳桥堰塞湖的形成,堆积第1套湖相沉积;第2次地震活动使湖相层变形;第3次地震活动使第1,2套湖相地层变形;第4次地震活动错断了湖相层之上最新的堆积物。全站仪实测结果表明最后一次古地震活动的垂直位移约为2.6～3.6m
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| 关 键 词： | 岷江断裂 古堰塞湖 全新世 古地震 |
| 收稿时间： | 2008-12-18 |
TECTONIC DEFORMATION OF LACUSTRINE SEDIMENTS IN QIANGYANG ON THE MINJIANG FAULT ZONE AND ANCIENT EARTHQUAKE |
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| KEAN Wei-ping,ZHAO Jin-quan,YAN Xiao-bing,LI Zi-hong,SU Zong-zheng.TECTONIC DEFORMATION OF LACUSTRINE SEDIMENTS IN QIANGYANG ON THE MINJIANG FAULT ZONE AND ANCIENT EARTHQUAKE[J].Seismology and Geology,2008,30(4):980-988. |
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| Authors: | KEAN Wei-ping ZHAO Jin-quan YAN Xiao-bing LI Zi-hong SU Zong-zheng |
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| Abstract: | During the post-disaster recovery in Maoxian country,we found that lacustrine sediments are exposed intermittently～30km north of the present Diexi barrier lake(Xiaohaizi)along the Minjiang River and its tributaries.According to the study on lacustrine sediments around Qiangyang village,we obtained the evidence of activities of the Minjiang Fault in the Holocene.It is concluded that the tectonic deformation of paleo-lacustrine sediments in Qiangyang possibly reflects multi-time ancient seismic activity of Mi |
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| Keywords: | Minjiang Fault paleo-dammed lake the Holocene paleoearthquake |
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