Rapid lateral variation of P-wave velocity at the base of the mantle   near the edge of the Large-Low Shear Velocity Province beneath the   western Pacific

doi:10.1093/gji/ggu455

CORC > 北京大学 > 地球与空间科学学院

	Rapid lateral variation of P-wave velocity at the base of the mantle near the edge of the Large-Low Shear Velocity Province beneath the western Pacific
	Tanaka, Satoru ; Kawakatsu, Hitoshi ; Obayashi, Masayuki ; Chen, Y. John ; Ning, Jieyuan ; Grand, Stephen P. ; Niu, Fenglin ; Ni, James
刊名	geophysical journal international
	2015
关键词	Composition of the mantle Body waves Pacific Ocean DOUBLE-ARRAY STACKING LOWERMOST MANTLE DEEP MANTLE EARTHS MANTLE SOUTHWESTERN PACIFIC SEISMOLOGICAL CONSTRAINTS SEISMIC TOMOGRAPHY PARTIAL MELT TRAVEL-TIME D&apos &apos -LAYER
DOI	10.1093/gji/ggu455
英文摘要	We examine P-wave velocity structure at the base of the mantle beneath the western Pacific, near the western edge of the Pacific Large-Low Shear Velocity Province (LLSVP), using high-quality seismograms provided by a large-scale mobile broad-band seismic observation in northeastern China (the NECESSArray project). Forward modelling using the reflectivity method is conducted to explain the variation of P-wave traveltimes as a function of epicentral distance near the core shadow zone. Additionally, PcP-P traveltimes are examined to enlarge the survey area. As a result, a rapid variation of P-wave velocity is detected at the base of the mantle. Regions of thin (20-50 km thick) and low velocity (-2 to -5 per cent) layers at the base of the mantle are intersected by an 80-km-thick region with a high velocity (+2 per cent). A slightly fast region exists at the northwest of the region with the thin low-velocity layer. These layers are typically separated by several hundred kilometres and would be difficult to explain by thermal effects alone. These observations suggest that very complicated thermochemical reactions occur near the edge of the Pacific LLSVP.; Geochemistry & Geophysics; SCI(E); 0; ARTICLE; stan@jamstec.go.jp; 2; 1050-1063; 200
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/386149]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Tanaka, Satoru,Kawakatsu, Hitoshi,Obayashi, Masayuki,et al. Rapid lateral variation of P-wave velocity at the base of the mantle near the edge of the Large-Low Shear Velocity Province beneath the western Pacific[J]. geophysical journal international,2015.
APA	Tanaka, Satoru.,Kawakatsu, Hitoshi.,Obayashi, Masayuki.,Chen, Y. John.,Ning, Jieyuan.,...&Ni, James.(2015).Rapid lateral variation of P-wave velocity at the base of the mantle near the edge of the Large-Low Shear Velocity Province beneath the western Pacific.geophysical journal international.
MLA	Tanaka, Satoru,et al."Rapid lateral variation of P-wave velocity at the base of the mantle near the edge of the Large-Low Shear Velocity Province beneath the western Pacific".geophysical journal international (2015).