气候变化领域集成服务门户(CCPortal): Lower crustal attenuation in northeastern Tibetan Plateau from M-L amplitude

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DOI	10.29382/eqs-2021-0007
	Lower crustal attenuation in northeastern Tibetan Plateau from M-L amplitude
	Liu, Yanbing; Pei, Shunping
通讯作者	Pei, SP (通讯作者)
发表日期	2021
ISSN	1674-4519
EISSN	1867-8777
起始页码	308
结束页码	316
卷号	34 期号:4
英文摘要	This study investigated the crustal attenuation structures of Sg and Lg waves of the northeastern Tibetan Plateau. We collected M-L amplitude data recorded at 168 permanent stations between 1985 and 2016 and 11 temporary broadband stations between 2014 and 2016. Detailed Q(0) variation maps of Sg and Lg waves were obtained by applying M-L amplitude tomography. The average Q(0) values of the Sg and Lg wave were 440 and 220, respectively. Relatively high attenuation anomalies of both waves appeared in the central and eastern regions of the Bayan Har Block and the east edge of the Qiangtang Block, which may be related to partial melting, high geotemperature, and strong tectonic processes. High attenuation anomalies were also found in the Qilian Orogenic Belt and Hetao Graben, which may be related to their active tectonic behavior and densely distributed faults. The relatively low attenuation anomalies of both waves were revealed in the Alax and Ordos blocks, Qaidam, Tarim, Qinghai Lake, and Gonghe basins, which can be explained by the tectonically stable properties and ancient composition of geological elements. These results indicate that the path between the highly attenuated lower crust of the Bayan Har Block and the Qilian Orogenic Belt is obstructed by three adjacent low attenuated areas (i.e., the Qilian, Qinghai Lake, and Gonghe basins); thus, it appears unlikely that a crustal flow channel from the interior of the Tibetan Plateau to the Qilian Orogenic Belt will form.
关键词	VELOCITY STRUCTURE WAVE-PROPAGATION BENEATH MANTLE TOMOGRAPHY HIMALAYA MARGIN CHINA
英文关键词	lower crust; attenuation; northeastern Tibetan Plateau; Q value
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000778816900007
来源期刊	EARTHQUAKE SCIENCE
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/260122
推荐引用方式 GB/T 7714	Liu, Yanbing,Pei, Shunping. Lower crustal attenuation in northeastern Tibetan Plateau from M-L amplitude[J]. 中国科学院青藏高原研究所,2021,34(4).
APA	Liu, Yanbing,&Pei, Shunping.(2021).Lower crustal attenuation in northeastern Tibetan Plateau from M-L amplitude.EARTHQUAKE SCIENCE,34(4).
MLA	Liu, Yanbing,et al."Lower crustal attenuation in northeastern Tibetan Plateau from M-L amplitude".EARTHQUAKE SCIENCE 34.4(2021).