气候变化领域集成服务门户(CCPortal): Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion

CCPortal

DOI	10.1007/s11430-013-4772-5
	Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion
	Liu QiMin; Zhao JunMeng; Lu Fang; Liu HongBing
通讯作者	Zhao, JM (通讯作者)
发表日期	2014
ISSN	1674-7313
EISSN	1869-1897
起始页码	741
结束页码	750
卷号	57 期号:4
英文摘要	Using seismic data of about one year recorded by 18 broadband stations of ASCENT project, we obtained 2547 receiver functions in the northeastern Tibetan Plateau. The Moho depths under 14 stations were calculated by applying the H-kappa domain search algorithm. The Moho depths under the stations with lower signal-noise ratio (SNR) were estimated by the time delay of the PS conversion. Results show that the Moho depth varies in a range of similar to 40-60 km. The Moho near the Haiyuan fault is vague, and its depth is larger than those on its two sides. In the Qinling-Qilian Block, the Moho becomes shallower gradually from west to east. To the east of 105A degrees E, the average depth of the Moho is 45 km, whereas the west is 50 km or even deeper. Combining our results with surface wave research, we suggest a boundary between the Qinling and the Qilian Mountains at around 105A degrees E. S wave velocities beneath 15 stations have been obtained through a linear inversion by using Crust2.0 as an initial model, and the crustal thickness that was derived by H-kappa domain search algorithm was also taken into account. The results are very similar to the results of previous active source studies. The resulting figure indicates that low velocity layers developed in the middle and lower crust beneath the transition zone of the Tibet Block and western Qinling, which may be related to regional faults and deep earth dynamics. The velocity of the middle and lower crust increases from the Songpan Block to the northeastern margin of Tibetan Plateau. Based on the velocity of the crust, the distribution of the low velocity zone and the composition of the curst (Poisson's ratio), we infer that the crust thickening results from the crust shortening along the direction of compression.
关键词	TIANSHAN OROGENIC BELT UPPER-MANTLE NEIGHBORHOOD ALGORITHM GEOPHYSICAL INVERSION SEISMIC-REFLECTION VELOCITY STRUCTURE EASTERN MARGIN BENEATH RATIO ZONE
英文关键词	northeastern margin of Tibetan Plateau; receiver function; crustal structure; crust flow
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000334176800016
来源期刊	SCIENCE CHINA-EARTH SCIENCES
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/258287
推荐引用方式 GB/T 7714	Liu QiMin,Zhao JunMeng,Lu Fang,et al. Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion[J]. 中国科学院青藏高原研究所,2014,57(4).
APA	Liu QiMin,Zhao JunMeng,Lu Fang,&Liu HongBing.(2014).Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion.SCIENCE CHINA-EARTH SCIENCES,57(4).
MLA	Liu QiMin,et al."Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion".SCIENCE CHINA-EARTH SCIENCES 57.4(2014).