气候变化领域集成服务门户(CCPortal): Crustal Lg attenuation within the North China Craton and its surrounding regions

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DOI	10.1093/gji/ggt235
	Crustal Lg attenuation within the North China Craton and its surrounding regions
	Zhao, Lian-Feng; Xie, Xiao-Bi; Wang, Wei-Min; Zhang, Jin-Hai; Yao, Zhen-Xing
通讯作者	Zhao, LF (通讯作者)
发表日期	2013
ISSN	0956-540X
EISSN	1365-246X
起始页码	513
结束页码	531
卷号	195 期号:1
英文摘要	We report on a broad-band high-resolution attenuation model for the North China Craton and surrounding regions based on regional Lg-wave data. Vertical broad-band waveforms recorded at 39 stations from 176 crustal earthquakes are collected to extract the Lg-wave amplitude spectra between 0.05 and 10.0 Hz. We use the dual-station method to generate a preliminary Q(Lg) model and use it as the initial model. Then, we combine the dual- and single-station data together to jointly invert the Q(Lg) distribution and Lg source excitation functions. These inversions are conducted independently at individual frequencies without using any a priori assumption about the frequency dependences in Q(Lg) and source terms. The maximum spatial resolution is approximately 1 degrees x 1 degrees in well-covered areas for frequencies between 0.05 and 2.0 Hz. The Q(Lg) image is then used to determine the relationship between the attenuation and different geological structures. Results show an average Q(0) (1 Hz Q(Lg)) of 374 for the entire North China Craton with an increasing trend from east to west. Average Q(0) values are 337, 361 and 421 for the east, central and west blocks, respectively. For the surrounding regions, the Eastern Tibetan plateau has a very low Q(0) of 188, while the Northeast China Plate and the Tianshan-Xingmeng fold belts are characterized by high Q(0) values of 506 and 424, respectively. We also investigate regional variations of the Lg attenuation in low-frequency band between 0.2 and 1.0 Hz.
关键词	TIBETAN PLATEAU UPPER-MANTLE HEAT-FLOW AMPLITUDE TOMOGRAPHY NUCLEAR-EXPLOSIONS CONTINENTAL-CRUST WAVE-PROPAGATION CODA-Q BENEATH RAYLEIGH
英文关键词	Body waves; Seismic attenuation; Seismic tomography; Crustal structure
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000325769800039
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258159
推荐引用方式 GB/T 7714	Zhao, Lian-Feng,Xie, Xiao-Bi,Wang, Wei-Min,et al. Crustal Lg attenuation within the North China Craton and its surrounding regions[J]. 中国科学院青藏高原研究所,2013,195(1).
APA	Zhao, Lian-Feng,Xie, Xiao-Bi,Wang, Wei-Min,Zhang, Jin-Hai,&Yao, Zhen-Xing.(2013).Crustal Lg attenuation within the North China Craton and its surrounding regions.GEOPHYSICAL JOURNAL INTERNATIONAL,195(1).
MLA	Zhao, Lian-Feng,et al."Crustal Lg attenuation within the North China Craton and its surrounding regions".GEOPHYSICAL JOURNAL INTERNATIONAL 195.1(2013).