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Mesoscale seismic hazard zonation in the Central Seismic Gap of the Himalaya by GIS-based analysis of ground motion, site and earthquake-induced effects
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-09-03 , DOI: 10.1007/s12665-021-09907-w
Ramesh Pudi 1 , Tapas R. Martha 1 , Priyom Roy 1 , K. Vinod Kumar 1 , P. Rama Rao 2
Affiliation  

The paper describes the mesoscale seismic hazard zonation study carried out in the Central Seismic Gap of the Himalaya by integration of ground motion, site and earthquake-induced effects using GIS technique. Three indices, namely (i) earthquake hazard index, (ii) liquefaction susceptibility index and (iii) landslide susceptibility index were estimated for comprehensive seismic hazard zonation mapping in this area. The earthquake hazard index was estimated by integration of data such as lithology, faults, soil, landforms, Gutenberg–Richter parameter (b value), predominant frequency, amplification factor and peak horizontal acceleration using the analytical hierarchy process (AHP) method. Similarly, geology and topographic parameters were integrated using the AHP method to estimate the Liquefaction Susceptibility Index. A multivariate statistical technique was used to estimate the Landslide Susceptibility Index. The three indices were combined to prepare mesoscale seismic hazard zonation map of the area which was classified into low, moderate, and high seismic hazard zones. Validation of the mesoscale seismic hazard zonation map was done using the isoseismal data of past earthquakes. High seismic hazard zones are found in the foothills and Siwalik region of the Himalaya, which consist of alluvial sand and unconsolidated sediments, whereas moderate zones are identified partially in the foothills, Siwalik and the Lesser Himalaya. This map will be useful for earthquake hazard mitigation in the NW Himalaya.



中文翻译:

通过基于 GIS 的地面运动、场地和地震诱发效应分析,在喜马拉雅中部地震裂隙中进行中尺度地震危险区划

本文描述了利用GIS技术综合地震动、场地和地震诱发效应在喜马拉雅中部地震裂隙中进行的中尺度地震危险区划研究。估计了三个指标,即(i)地震危险指数,(ii)液化敏感性指数和(iii)滑坡敏感性指数,用于该地区综合地震危险区带制图。地震灾害指数是通过综合岩性、断层、土壤、地貌、Gutenberg-Richter 参数等数据估算得到的(b值)、优势频率、放大系数和峰值水平加速度,使用层次分析法 (AHP) 方法。同样,使用层次分析法对地质和地形参数进行整合,以估计液化敏感性指数。多变量统计技术用于估计滑坡敏感性指数。结合这三个指标,绘制了该地区的中尺度地震危险区带图,将其划分为低、中、高地震危险区。使用过去地震的等震数据对中尺度地震危险区带图进行了验证。在喜马拉雅山的山麓和西瓦利克地区发现了高地震危险区,由冲积砂和松散的沉积物组成,而在山麓部分确定了中等地震危险区,西瓦利克和小喜马拉雅山。该地图将有助于减轻喜马拉雅西北部的地震灾害。

更新日期:2021-09-04
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