基于遥感震害指数的尼泊尔地震综合烈度评估研究

Comprehensive Intensity Assessment of Nepal Earthquake Based on Remote Sensing Earthquake Damage Index

2015年4月25日在尼泊尔廓尔喀县发生的8.1级地震及后续强烈余震,造成尼泊尔北部严重的人员伤亡和财产损失,灾区建筑物倒塌损失严重。本文利用现场震害调查资料和高分卫星遥感影像,开展建筑物震害遥感解译,得到各个遥感解译点的遥感震害指数,结合现场调查点评估的烈度拟合了遥感震害指数-实际震害指数转换关系,再根据遥感震害指数估计了全部解译点的震害指数及地震烈度。估计的烈度与现场调查结果对比显示出较好的一致性,研究结果为该地区今后发生地震提供了可借鉴的遥感评估震害指数转换模型。

The earthquake with magnitude 8.1 occurred in Gorkha County,Nepal on April 25,2015,following strong aftershocks,caused serious casualties and property losses in northern Nepal,with buildings in the disaster area severely damaged.In this paper,the seismic damage investigation data and satellite remote sensing image were used to conduct remote sensing interpretation,in order to get the remote sensing-based seismic damage index.Then by comparing site point intensity from investigation and assessment in the field with remote sensing seismic damage index,we obtain the fitting transformation relation between remote sensing seismic damage index and actual seismic damage index.Then we estimate the seismic damage index and seismic intensity of full interpretation.The estimated intensity is in good agreement with the field survey results.Our results provide a reference for the transformation model of seismic damage index that can be used for disaster evaluation by remote sensing for earthquakes in this area in future.