Intensity Prediction Equations for Himalaya and its sub-regions based on data from traditional sources and USGS’s Did You Feel It? (DYFI)

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
P. Anbazhagan, Harish Thakur
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Abstract

This study has developed Intensity Prediction Equations (IPEs) for the Himalayas and its sub-regions (divided into North-West Himalaya, Central Himalaya, and North-East Himalaya). For this purpose, intensity data reported in previous studies using traditional methods (like field surveys, media reports, and newspapers) and internet-based questionnaires (such as USGS’s Did You Feel It? or DYFI) were used to catalogue two separate intensity datasets. Intensities of traditional datasets were also reassessed for some earthquake events by different studies in the different scales of assignment, which was homogenized for the same intensity scale. IPEs are derived for both datasets separately using a two-stage and one-stage regression technique. These IPEs are developed for a first- and second-order relation with respect to earthquake magnitude. A “maximum intensity vs. magnitude approximation of the IPE” approach relying on an optimal hypocentral depth has also been proposed to select the best-suited IPEs. The information-theoretic approach-based Log-likelihood method (Scherbaum et al. 2009) has been used to check and compare developed IPE performance for events not used for IPE development. These newly developed equations can be used to assess the damage potential of future earthquakes.

Abstract Image

根据传统来源和美国地质调查局的 "你感觉到了吗?
本研究为喜马拉雅山及其次区域(分为西北喜马拉雅山、中部喜马拉雅山和东北喜马拉雅山)开发了强度预测方程 (IPE)。为此,使用传统方法(如实地调查、媒体报道和报纸)和基于互联网的问卷调查(如美国地质调查局的 "您感觉到了吗?传统数据集的烈度也由不同研究以不同的分配尺度对某些地震事件进行了重新评估,并在同一烈度尺度下进行了同质化处理。使用两阶段和一阶段回归技术分别得出了两个数据集的 IPE。这些 IPE 是针对地震震级的一阶和二阶关系得出的。此外,还提出了一种 "最大烈度与震级近似 IPE "的方法,该方法依赖于最佳次中心深度来选择最合适的 IPE。基于信息论方法的对数似然法(Scherbaum 等人,2009 年)被用来检查和比较未用于 IPE 开发的事件的 IPE 性能。这些新开发的方程可用于评估未来地震的破坏潜力。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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