2008年汶川地震导致的斜坡物质响应率及其空间分布规律分析

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Abstract As the main phenomenon of slope mass movement response on earthquake，research of earthquake triggered landslides has important practical applications and theoretical scientific significances，especially related to the 2008 Ms 8.0 Wenchuan Earthquake. Landslides caused by the earthquake are widespread concerned due to they caused strong landscape changed，enormous loss of life and property damages. In present research，the concept of response rate of seismic slope mass movement(RRSSMM) was proposed. In the first stage，a landslide inventory map was prepared using the landslides triggered by the Wenchuan Earthquake，and was delineated from interpretation of aerial photographs，and field surveys. In the second stage，distribution raster and isoline map of RRSSMM are constructed based on“area-volume”correlation of landslides per 1 km2 grid cells. Next，Area distribution map of RRSSMM was constructed，and it showed that relationship of frequency-RRSSMM or area-RRSSMM in coincidence with power law in range of RRSSMM less than or equal to 10 m. It is showed that the maximum RRSSMM value appears at the position of Daguangbao landslide (the largest landslide triggered by the Wenchuan Earthquake)，up to 47.923 5 m. Areas of RRSSMM value exceeding 1 m almost appear in the northwest facing areas，on the hanging wall，of a section of Yingxiu-Beichuan fault (from Yingxiu Town to Beichuan County). Those areas of high RRSSMM values correspond to hanging wall of thrust fault. It is indicated that strong controlling of earthquake on landslide occurrences on hanging wall of thrust fault. Spatial distribution analysis of RRSSMM controlled by different landslide conditioning factors were carried out base on GIS technology and statistical theory. These landslide conditioning factors include topographic factors，geologic factors and seismic factors，such as，elevation，slope angle，slope aspect，slope curvature，slope position，distance from drainages，lithology，distance from the epicenter，distance from the Yingxiu-Beichuan fault，distance along the Yingxiu-Beichuan fault，peak ground acceleration(PGA)，and seismic intensity. The statistical results show that RRSSMM has positive correlation with slope angle，PGA，and seismic intensity，and negative correlation with distance from drainages，distance from the epicenter，and distance from the Yingxiu-Beichuan surface fault-rupture. It also represents the maximum value of RRSSMM appears between 1 600–1 800 m ranges in elevation. The highest RRSSMM value has preferred orientation，dominated by the eastern facing. There were small RRSSMM close to zero for plan curvature. For slope position，middle slope，lower slope and valley occupy the highest RRSSMM values. The two lithology groups of sandstone，siltstone (Z) and sandstone，siltstone，chert，slate (∈) had the highest RRSSMM values. The statistical results of RRSSMM along the Yingxiu-Beichuan fault show that the RRSSMM strongly affected by fault in thrusting movement feature. The final RRSSMM distribution data is of great significance on rivers and geomorphic evolution，and debris flow researches，and it can be timely shared to researchers in related fields，such as，tectonic geomorphology，engineering geology，environmental geology，and geological hazards etc. Research methods in this research can be applied to other regional seismic landslide events.

Key words： engineering geology Wenchuan Earthquake triggered landslides inventory response rate of seismic slope mass movement(RRSSMM) spatial distribution statistical analysis

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XU Chong,XU Xiwei. RESPONSE RATE OF SEISMIC SLOPE MASS MOVEMENTS RELATED TO 2008 WENCHUAN EARTHQUAKE AND ITS SPATIAL DISTRIBUTION ANALYSIS[J]. , 2013, 32(s2): 3888-3908.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3888

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