气候变化领域集成服务门户(CCPortal): Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya

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DOI	10.1007/s11069-020-04031-7
	Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya
	Monika; Kumar P.; Sandeep; Kumar S.; Joshi A.; Devi S.
发表日期	2020
ISSN	0921030X
起始页码	1219
结束页码	1237
卷号	103 期号:1
英文摘要	The present work explores the attenuation characteristics of Garhwal and Kumaon regions of northwest Himalaya, India. A comparative study of P- and S-wave quality factors (Qα and Qβ) is used to appreciate the different attenuation characteristics of these two regions. The strong motion data of 105 local earthquakes recorded in Garhwal and Kumaon region are considered for the analysis. The coda normalization method is implemented to compute Qα and Qβ at each recording site of form Q(f) = Qofn. The regional relationship obtained by using site-specific quality factor relations is Qα(f) = (55 ± 3)f(0.90±0.06), Qβ(f) = (74 ± 5)f(0.87±0.08) for Garhwal region and Qα(f) = (34 ± 1)f(0.94±0.03), Qβ(f) = (58 ± 2)f(0.90±0.02) for Kumaon region, which clearly suggest the existence of spatial variation of attenuation properties in these two regions. The Kumaon region has low Qα and Qβ as compared to Garhwal, which means Kumaon region has high rate of attenuation than Garhwal region, as Q is inversely proportional to the attenuation. Hence, based on obtained attenuation properties it is proposed that Garhwal region has high seismic hazard potential zone as compared to its adjacent Kumaon region. The high value of Qβ/Qα (˃ 1) obtained in the present work indicates the presence of fluid or partially saturated rocks in the earth crust for both Garhwal and Kumaon regions. The variable value of ratio (Qβ/Qα) obtained for Garhwal and Kumaon region specifies the different fluid saturations or fluid types existing for both the regions, and it may be the possible reason of distinct attenuation properties of these two regions. © 2020, Springer Nature B.V.
关键词	Attenuation Himalaya Quality factor Seismic hazard
英文关键词	coda; comparative study; earthquake event; P-wave; Q factor; S-wave; seismic attenuation; spatial variation; strong motion; 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/205842
作者单位	Wadia Institute of Himalayan Geology, Dehradun, India; Banaras Hindu University, Varanasi, Uttar Pradesh, India; Indian Institute of Technology, Roorkee, Uttarakhand, India
推荐引用方式 GB/T 7714	Monika,Kumar P.,Sandeep,et al. Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya[J],2020,103(1).
APA	Monika,Kumar P.,Sandeep,Kumar S.,Joshi A.,&Devi S..(2020).Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya.Natural Hazards,103(1).
MLA	Monika,et al."Spatial variability studies of attenuation characteristics of Qα and Qβ in Kumaon and Garhwal region of NW Himalaya".Natural Hazards 103.1(2020).