本文選題：九寨溝地震　切入點：地震滑坡危險性　出處：《地質(zhì)力學學報》2017年05期

【摘要】：基于地震滑坡危險性評估的Newmark累積位移模型,利用震前獲取的震區(qū)地形數(shù)據(jù)、區(qū)域地質(zhì)資料,結(jié)合地震動近實時獲取技術(shù),開展了四川九寨溝M_s7.0級地震誘發(fā)滑坡的應(yīng)急快速評估。地震滑坡位移分析結(jié)果表明,同震滑坡活動的中—高強度區(qū)分布在斷層兩側(cè)寬約4 km的帶狀區(qū)域內(nèi),整體沿北西方向延伸。其中,極震區(qū)的豐雪塘、日則和干海子等城鎮(zhèn)駐地及附近道路的滑坡強度相對較高;震前、震后影像對比表明九寨溝地震誘發(fā)的滑坡類型以淺表型碎屑流及小規(guī)模崩塌為主,且同震碎屑流多是在震前已有碎屑流的基礎(chǔ)上進一步活動擴展而來,震后汛期泥石流隱患也不容忽視;通過典型地區(qū)滑坡位移分析結(jié)果與震前、震后影像對比,表明滑坡位移分析結(jié)果能夠較好的反映同震滑坡的宏觀分布特征,但在場地尺度上吻合程度欠佳,后續(xù)將通過提升巖性和地形等數(shù)據(jù)質(zhì)量進行改進。研究結(jié)果可為災(zāi)情研判提供寶貴信息,對提高災(zāi)害應(yīng)急救援效率具有重要意義。
[Abstract]:Based on the Newmark cumulative displacement model of seismic landslide risk assessment, using the topographic data and regional geological data obtained before the earthquake, combined with the near real-time acquisition technology of ground motion, The rapid emergency assessment of landslide induced by the Jiuzhaigou earthquake (M _ S M_s7.0) in Sichuan Province is carried out. The results of landslide displacement analysis show that the medium-high intensity area of co-seismic landslide activity is distributed in a zonal area with a width of about 4 km on both sides of the fault. The landslide intensity of Fengxuetang, Rizai and Qianhaizi towns in the extreme earthquake area and nearby roads is relatively high; before the earthquake, The comparison of post-earthquake images shows that the types of landslides induced by the Jiuzhaigou earthquake are mainly shallow clastic flows and small scale collapses, and the coseismic debris flows are mostly extended on the basis of the existing clastic flows before the earthquake. The hidden dangers of debris flow in flood season after earthquake can not be ignored, and the results of landslide displacement analysis in typical areas are compared with those before and after the earthquake, which shows that the results of landslide displacement analysis can reflect the macroscopic distribution characteristics of co-seismic landslides. However, the degree of coincidence on site scale is not good, and the subsequent improvement will be carried out by improving the quality of data such as lithology and topography. The results of the study can provide valuable information for the study of disaster situation, and are of great significance for improving the efficiency of disaster emergency rescue.
【作者單位】： 中國地質(zhì)科學院地質(zhì)力學研究所;國土資源部新構(gòu)造運動與地質(zhì)災(zāi)害重點實驗室;中國地質(zhì)調(diào)查局;
【基金】：國家自然科學基金(41372374,41572313) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(DD20160271,12120114035501)
【分類號】：P315.9;P642.22

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本文編號：1672514