Liao Liye, Zeng Qingli, Shi Yongyue, Ma Xuping, Du Linlin, Zhou Jian, Zhang Luqing
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引用次数: 0
Abstract
Large landslides often cause catastrophic life losses and infrastructure damage. Identification of the driving forces of large ancient landslides is of utmost importance for the understanding of geohazard assessment and regional geomorphologic evolution and for the understanding of regional paleoclimate and paleoseismology. Through field geological survey, multi-temporal satellite image interpretation, sedimentological observation, and static and dynamic numerical simulation, the paper studied the geo-environments and deposit succession of the Hongshiyan paleolandslide (HSYPL), over against the Hongshiyan landslide (HSYL) triggered by the 2014 Ludian MS (surface wave magnitude) 6.5 earthquake. The study reveals that (1) the HSYPL and HSYL are symmetrically distributed on the opposite banks of the Niulan River and on the opposite wings of a vertical anticline plunging west. Both landslides involved an anti-dip slope structure of upper hard rock while lower soft rock. (2) Two phases of deposit succession in the paleolandslide accumulations were recognized from their surficial appearances, planar distribution, spatial superimposition relationship, permeability test, and borehole survey. (3) The deposit did not result from one single paleolandslide event but two long-interval individual events, i.e., penultimate landslide (PL) and last landslide (LL), whose source volumes were estimated to be ~ 11.8 Mm3 and ~ 113.5 Mm3, respectively. (4) These two landslides kept stable under static conditions but failed when the SN component acceleration reached 1.4 and 1.2 times the value of the 2014 Ludian MS 6.5 earthquake. The ground motions basically correspond to the earthquake magnitudes that are back-analyzed by their volumes. (5) Both the penultimate landslide and last landslide were seismically triggered with high probability. The former was more likely due to the seismic activity of the Zhaotong-Ludian fault than the Baogunao-Xiaohe fault, while the latter might be induced by either fault which was active since the Holocene. Our findings present new insights into the regional seismological history and considerations on the risk reduction of the new hydro-project constructed from the Hongshiyan co-seismic landslide dam.
期刊介绍:
Landslides are gravitational mass movements of rock, debris or earth. They may occur in conjunction with other major natural disasters such as floods, earthquakes and volcanic eruptions. Expanding urbanization and changing land-use practices have increased the incidence of landslide disasters. Landslides as catastrophic events include human injury, loss of life and economic devastation and are studied as part of the fields of earth, water and engineering sciences. The aim of the journal Landslides is to be the common platform for the publication of integrated research on landslide processes, hazards, risk analysis, mitigation, and the protection of our cultural heritage and the environment. The journal publishes research papers, news of recent landslide events and information on the activities of the International Consortium on Landslides.
- Landslide dynamics, mechanisms and processes
- Landslide risk evaluation: hazard assessment, hazard mapping, and vulnerability assessment
- Geological, Geotechnical, Hydrological and Geophysical modeling
- Effects of meteorological, hydrological and global climatic change factors
- Monitoring including remote sensing and other non-invasive systems
- New technology, expert and intelligent systems
- Application of GIS techniques
- Rock slides, rock falls, debris flows, earth flows, and lateral spreads
- Large-scale landslides, lahars and pyroclastic flows in volcanic zones
- Marine and reservoir related landslides
- Landslide related tsunamis and seiches
- Landslide disasters in urban areas and along critical infrastructure
- Landslides and natural resources
- Land development and land-use practices
- Landslide remedial measures / prevention works
- Temporal and spatial prediction of landslides
- Early warning and evacuation
- Global landslide database