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Delineation of the Causative Fault of Recent Earthquakes (April–May 2020) in Delhi from Seismological and Morphometric Analysis
Journal of the Geological Society of India ( IF 1.2 ) Pub Date : 2021-05-13 , DOI: 10.1007/s12594-021-1711-5
Brijesh K. Bansal , Kapil Mohan , Ahsan Ul Haq , Mithila Verma , S. K. Prajapati , G. M. Bhat

Recently, amid the pandemic of COVID-2019, the north-east Delhi region experienced two small earthquakes in a short span of 1 month; the first occurred on 12th April 2020 (Mw 3.5) and the other on 10th May 2020 (Mw 3.4). These events were followed by 4 aftershocks of magnitude Mw ≤ 3.0. We carried out morphotectonic (high stream length-gradient index) and static Coulomb stress failure analyses to delineate the hidden causative fault(s) in the region. In the study, ASTER DEM data of 30 m resolution and Survey of India (SoI) toposheets on 1:50,000 scales were used for morphotectonic analysis. The analysis depicted a very high stream length-gradient (SL) and fall in elevation in the epicentral area, suggesting the area to be tectonically active with a NE-SW trending fault line. In addition, the nature of static Coulomb failure stress contours for both the main events, Mw 3.5 and Mw 3.4, suggests an NNE-SSW trending high Coulomb stress regime. Such a high coulomb stress regime is obvious at the location where a high SL index and fall in elevation were marked, which clearly indicates the presence of NNE-SSW trending a causative fault, named ‘Khanpur-Japti fault’.



中文翻译:

从地震学和形态学分析中描绘德里最近地震(2020年4月至2020年5月)的成因断层

最近,在COVID-2019大流行中,东北德里地区在短短1个月内经历了两次小地震。第一次发生在2020年4月12(M w 3.5),另一次发生在2020年5月10(M w 3.4)。这些事件之后是4次M w级余震≤3.0。我们进行了构造构造(高流长梯度指数)和静态库仑应力破坏分析,以描绘该地区隐藏的致病性断层。在这项研究中,使用30 m分辨率的ASTER DEM数据和1:50,000比例的印度调查(SoI)拓扑表进行形态构造分析。该分析表明,震中地区的水流高度梯度(SL)很高,并且海拔下降,表明该地区以NE-SW趋势断层线构造活动。此外,对于主事件M w 3.5和M w来说,静态库仑破坏应力等值线的性质3.4,表明NNE-SSW趋向于高库仑应力状态。如此高的库仑应力状态在高SL指数和高程下降明显的地方很明显,这清楚地表明NNE-SSW的存在导致了一个称为“ Khanpur-Japti断层”的致病性断层。

更新日期:2021-05-13
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