气候变化领域集成服务门户(CCPortal): Variations of intrinsic and scattering seismic attenuation with depth in western Tibet

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DOI	10.1016/j.pce.2023.103454
	Variations of intrinsic and scattering seismic attenuation with depth in western Tibet
	Biswas, Rahul; Singh, Chandrani
发表日期	2023
ISSN	1474-7065
EISSN	1873-5193
卷号	131
英文摘要	In this study, the depth-dependent seismic wave attenuation beneath western Tibet have been investigated using 628 local earthquakes recorded at Y2 network operated by US-China collaboration group from July 2007 to May 2011. Initially, we have calculated the attenuation of shear wave (Q7s 1) using coda normalization method and coda waves (Q7 1 c ) using single isotropic scattering model. Thereafter, we have estimated the quantitative values of scattering (Q7sc1) and intrinsic (Q7i1) attenuation using Wennerberg approach. The observations are made at five different central frequencies (1.5, 3, 6, 12, and 18 Hz) and five lapse time windows (30, 40, 50, 60, and 70 s). The results show frequency and lapse time dependence of Q7c1, Q7 1 sc and Q7i 1 values for western Tibet. Q7 1 c and Q7 1 i shows similar trend suggesting that the key mechanism is intrinsic dissipation for the decay of coda wave in the medium. Q7i1 is found to be as a dominant mechanism over Q7sc1 at all the investigated depth beneath western Tibet. Interestingly, the values of Q7c1 and Q7i1 decrease and get closer to Q7sc1 with increasing lapse time window/ depth. It signifies the impact of ongoing underthrusting Indian lithosphere at deeper depth. A stronger intrinsic attenuation at shallow depth reflects the effect of the mid crustal low-velocity zone (LVZ) below Tethyan Himalaya and the southern Lhasa terrane. The obtained results in this study are also in good agreement with other reported results from seismically active regions in the world.
关键词	Quality factor Scattering Intrinsic attenuation Western tibet
英文关键词	FREQUENCY-DEPENDENT ATTENUATION; LAPSE-TIME-DEPENDENCE; CODA WAVE ATTENUATION; MULTIPLE-SCATTERING; ANELASTIC ATTENUATION; EASTERN HIMALAYA; ANDAMAN ISLANDS; ENERGY-TRANSFER; REGION; SEPARATION
WOS研究方向	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS记录号	WOS:001087520100001
来源期刊	PHYSICS AND CHEMISTRY OF THE EARTH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282585
作者单位	Council of Scientific & Industrial Research (CSIR) - India; CSIR - National Geophysical Research Institute (NGRI); Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Kharagpur
推荐引用方式 GB/T 7714	Biswas, Rahul,Singh, Chandrani. Variations of intrinsic and scattering seismic attenuation with depth in western Tibet[J],2023,131.
APA	Biswas, Rahul,&Singh, Chandrani.(2023).Variations of intrinsic and scattering seismic attenuation with depth in western Tibet.PHYSICS AND CHEMISTRY OF THE EARTH,131.
MLA	Biswas, Rahul,et al."Variations of intrinsic and scattering seismic attenuation with depth in western Tibet".PHYSICS AND CHEMISTRY OF THE EARTH 131(2023).