Climate Change Data Portal
DOI | 10.1111/1755-6724.13805 |
Characteristics and Formation Mechanism of Giant Long-Runout Landslide: A Case Study of the Gamisi Ancient Landslide in the Upper Minjiang River, China | |
Guo, Changbao1,2; Wu, Ruian1; Zhang, Yongshuang3; Ren, Sanshao1; Yang, Zhihua1; Li, Xue1 | |
发表日期 | 2019 |
ISSN | 1000-9515 |
EISSN | 1755-6724 |
卷号 | 93期号:4页码:1113-1124 |
英文摘要 | The upper reaches of the Minjiang River are in the eastern margin of the Tibetan Plateau, where active faults are well developed and earthquakes frequently occur. Anomalous climate change and the extremely complex geomechanical properties of rock and soil have resulted in a number of geohazards. Based on the analysis of remote sensing interpretations, geological field surveys, geophysical prospecting and geological dating results, this paper discusses the developmental characteristics of the Gamisi ancient landslide in Songpan County, Sichuan Province, and investigates its geological age and formation mechanism. This study finds that the Gamisi ancient landslide is in the periglacial region of the Minshan Mountain and formed approximately 25 ka BP. The landslide initiation zone has a collapse and slide zone of approximately 22.65x10(6)-31.7x10(6) m(3) and shows a maximum sliding distance of approximately 1.42 km, with an elevation difference of approximately 310 m between the back wall of the landslide and the leading edge of the accumulation area. The landslide movement was characterized by a high speed and long runout. During the sliding process, the landslide body eroded and dammed the ancient Minjiang River valley. The ancient river channel was buried 30-60 m below the surface of the landslide accumulation area. Geophysical prospecting and drilling observations revealed that the ancient riverbed was approximately 80-100 m thick. After the dam broke, the Minjiang River was migrated to the current channel at the leading edge of the landslide. The Gamisi ancient landslide was greatly affected by the regional crustal uplift, topography, geomorphology and paleoclimatic change. The combined action of periglacial karstification and climate change caused the limestone at the rear edge of the landslide fractured, thus providing a lithological foundation for landslide occurrence. Intense tectonic activity along the Minjiang Fault, which runs through the middle and trailing parts of the Gamisi ancient landslide, may have been the main factor inducing landsliding. Studying the Gamisi ancient landslide is of great significance for investigating the regional response to paleoclimatic change and geomorphologic evolution of the Minjiang Fault since the late Pleistocene and for disaster prevention and mitigation. |
WOS研究方向 | Geology |
来源期刊 | ACTA GEOLOGICA SINICA-ENGLISH EDITION |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/101227 |
作者单位 | 1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China; 2.Key Lab Act Tecton & Crustal Stabil Assessment, Beijing 100081, Peoples R China; 3.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China |
推荐引用方式 GB/T 7714 | Guo, Changbao,Wu, Ruian,Zhang, Yongshuang,et al. Characteristics and Formation Mechanism of Giant Long-Runout Landslide: A Case Study of the Gamisi Ancient Landslide in the Upper Minjiang River, China[J],2019,93(4):1113-1124. |
APA | Guo, Changbao,Wu, Ruian,Zhang, Yongshuang,Ren, Sanshao,Yang, Zhihua,&Li, Xue.(2019).Characteristics and Formation Mechanism of Giant Long-Runout Landslide: A Case Study of the Gamisi Ancient Landslide in the Upper Minjiang River, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,93(4),1113-1124. |
MLA | Guo, Changbao,et al."Characteristics and Formation Mechanism of Giant Long-Runout Landslide: A Case Study of the Gamisi Ancient Landslide in the Upper Minjiang River, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 93.4(2019):1113-1124. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。