气候变化领域集成服务门户(CCPortal): Potential seismogenic asperities in the Garhwal–Kumaun region, NW Himalaya: seismotectonic implications

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DOI	10.1007/s11069-021-04574-3
	Potential seismogenic asperities in the Garhwal–Kumaun region, NW Himalaya: seismotectonic implications
	Tiwari A.; Paul A.; Singh R.; Upadhyay R.
发表日期	2021
ISSN	0921030X
起始页码	73
结束页码	95
卷号	107 期号:1
英文摘要	The Garhwal–Kumaun region (29°–31.5°N; 77°–81°E) in NW Himalaya lies in the Central Seismic Gap where the accumulated strain energy is sufficient for a future great earthquake. A broadband seismic network is continuously monitoring the seismic activity in this region and recorded a total of 3634 well located seismic events justified within the acceptable error bars (ERZ, ERH < 5.0) from 2007 to 2018 with hypocentral distances ranging from 0 to 350 km. In the present work, frequency-magnitude distribution (b-value) and fractal dimension (Dc-value) are investigated along (NW–SE) and across (SW–NE) the strike of Garhwal–Kumaun Himalaya. The study area has been divided into three different seismogenic asperities. Our results revealed that the proximity of Rudraprayag–Chamoli region exhibits significant low b-value (0.702 ± 0.03) and Dc-value (1.38 ± 0.03) and indicates high stress accumulation. The region has witnessed 1999 Chamoli earthquake Mb 6.3 and 2017 Rudraprayag earthquake M 5.7. A detailed study of b-value and Dc-value variation as a function of depth is also examined. The composite trend in abrupt escalation of b-value is observed at depth ≈ 12 km for Garhwal region and ≈ 7 km for Kumaun region. A well demarcation of crustal heterogeneity, high stress regime and associated seismogenic asperity is plotted. The low b-value and Dc-value depth ranges are coinciding with mid-crustal ramp and exhibiting a potential zone (12–15 km) for future great earthquake in the Garhwal region. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.
关键词	b-value Central seismic gap Fractal dimension Himalayan seismicity Seismogenic asperity Seismotectonics
英文关键词	asperity; earthquake hypocenter; earthquake mechanism; error analysis; fractal analysis; future prospect; mountain region; seismicity; seismotectonics; strain rate; tectonic setting; Garhwal Himalayas; Himalayas; India; Kumaun Himalayas; Uttarakhand
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206610
作者单位	Wadia Institute of Himalayan Geology, Dehradun, India; Department of Earth Sciences, Graphic Era Hill University, Dehradun, India; Department of Geology, Kumaun University, Nainital, India
推荐引用方式 GB/T 7714	Tiwari A.,Paul A.,Singh R.,等. Potential seismogenic asperities in the Garhwal–Kumaun region, NW Himalaya: seismotectonic implications[J],2021,107(1).
APA	Tiwari A.,Paul A.,Singh R.,&Upadhyay R..(2021).Potential seismogenic asperities in the Garhwal–Kumaun region, NW Himalaya: seismotectonic implications.Natural Hazards,107(1).
MLA	Tiwari A.,et al."Potential seismogenic asperities in the Garhwal–Kumaun region, NW Himalaya: seismotectonic implications".Natural Hazards 107.1(2021).