| 滇西南地区汉母坝-澜沧断裂晚第四纪构造活动的地质地貌证据 |
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| 引用本文： | 刘兴旺,袁道阳,张波,方良好,邵延秀.滇西南地区汉母坝-澜沧断裂晚第四纪构造活动的地质地貌证据[J].西北地震学报,2013,35(S1):108-115. |
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| 作者姓名： | 刘兴旺 袁道阳 张波 方良好 邵延秀 |
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| 作者单位： | 中国地震局兰州地震研究所, 甘肃兰州 730000;中国地震局地震预测研究所兰州科技创新基地, 甘肃兰州 730000;兰州大学西部环境教育部重点实验室, 甘肃兰州 730000,中国地震局兰州地震研究所, 甘肃兰州 730000,中国地震局兰州地震研究所, 甘肃兰州 730000;中国地震局地震预测研究所兰州科技创新基地, 甘肃兰州 730000,中国地震局兰州地震研究所, 甘肃兰州 730000,中国地震局兰州地震研究所, 甘肃兰州 730000;中国地震局地震预测研究所兰州科技创新基地, 甘肃兰州 730000 |
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| 基金项目： | 地震行业科研专项(201108001) |
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| 摘 要： | 通过对汗母坝-澜沧断裂晚第四纪地质、地貌实地调查与测量,并结合前人研究成果,讨论了该断裂晚第四纪最新构造活动特征。综合分析认为,汗母坝-澜沧断裂为一条以右旋走滑为主的全新世活动断裂,长约120 km,整体走向NNW。该断裂活动习性具有明显的分段特征,北段称为汗母坝断裂,是1988年耿马7.2级地震的发震断裂;南段称为澜沧断裂,是1988年澜沧7.6级地震的发震断裂之一。晚第四纪以来其新活动形成了丰富的断错地貌现象,如冲沟和山脊右旋位错、断层沟槽、断层垭口、断层陡坎、断陷凹坑等。根据断裂断错地貌特征的相应资料估计,该断裂晚第四纪右旋走滑速率约为(4.7±0.5) mm/a。
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| 关 键 词： | 汗母坝-澜沧断裂 断层地貌 断层陡坎 右旋走滑 |
| 收稿时间： | 2013/4/10 0:00:00 |
Geological and Geomorphological Evidence of Tectonic Activity of Hanmuba-Lancang Fault at Southwestern Yunnan in Late Quaternary |
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| LIU Xing-wang,YUAN Dao-yang,ZHANG Bo,FANG Liang-hao and SHAO Yan-xiu.Geological and Geomorphological Evidence of Tectonic Activity of Hanmuba-Lancang Fault at Southwestern Yunnan in Late Quaternary[J].Northwestern Seismological Journal,2013,35(S1):108-115. |
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| Authors: | LIU Xing-wang YUAN Dao-yang ZHANG Bo FANG Liang-hao and SHAO Yan-xiu |
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| Institution: | Lanzhou Institute of Seismology, CEA, Lanzhou Gansu 730000, China;Lanzhou Base of Institute of Earthquake Prediction, CEA, Lanzhou Gansu 730000, China;Key Laboratory of Western China''s Environmental System with the Ministry of Education, Lanzhou University, Lanzhou Gansu 730000, China,Lanzhou Institute of Seismology, CEA, Lanzhou Gansu 730000, China,Lanzhou Institute of Seismology, CEA, Lanzhou Gansu 730000, China;Lanzhou Base of Institute of Earthquake Prediction, CEA, Lanzhou Gansu 730000, China,Lanzhou Institute of Seismology, CEA, Lanzhou Gansu 730000, China and Lanzhou Institute of Seismology, CEA, Lanzhou Gansu 730000, China;Lanzhou Base of Institute of Earthquake Prediction, CEA, Lanzhou Gansu 730000, China |
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| Abstract: | According to field survey and measurement of the geology and landform of the Hanmuba-Lancang fault in late Quaternary, the latest tectonic characteristics of the fault in late Quaternary were discussed on the basis of previous study. The preliminary analysis was that the fault with length of about 120 km belonged to the Holocene active fault with right-lateral strike-slip. The fault activity had obvious characteristics of segment. The north segment was Hanmuba fault, which was the causative structure of Gengma Ms7.2 earthquake in 1988. The south segment was Lancang fault, which was one of seismogenic faults of Lancang Ms7.6 earthquake in 1988. A variety of dislocation landforms had been formed by new fault activities since the late Quaternary, such as dextral dislocation of gullies and ridges, fault groove, fault pars, fault escarpment and pit. According to the relevant data, we estimated that the rate of right-lateral strike-slip of the fault in late Quaternary was about (4.7±0.5) mm/a. |
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| Keywords: | Hanmuba-Lancang fault fault landform fault scarp right-lateral strike-slip |
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