Multiple discontinuities near 660 km beneath Tonga area

doi:10.1029/2006GL027262

CORC > 北京大学 > 地球与空间科学学院

	Multiple discontinuities near 660 km beneath Tonga area
	Zang, Shao-Xian ; Zhou, Yuan-Ze ; Ning, Jie-Yuan ; Wei, Rong-Qiang
刊名	geophysical research letters
	2006
关键词	MANTLE DISCONTINUITIES TRANSITION ZONE IZU-BONIN SEISMIC DISCONTINUITIES SUBDUCTING SLABS TRAVEL-TIMES COMPUTATION TOPOGRAPHY SHARPNESS
DOI	10.1029/2006GL027262
英文摘要	[1] We study the discontinuities beneath Tonga subduction zone using the deep earthquakes recorded by the Pacific Northwest Seismic Network (PNSN). The multiple discontinuities around 660 km beneath Tonga subduction zone are found using converted phase SdP. The amplitude ratios of the converted phase with the direct P wave (Ac/Ap) are also determined. The largest number of robust converted phases with large Ac/Ap comes from the depth range of 660-690 km, its peak is at 680 km; the second one appears in the depth range of 700-745 km, its peak is at 740 km. The two discontinuities are obviously depressed by the subduction slab. According to experimental and numerical studies, a possible explanation of the observation is that the first discontinuity is formed by the transition of gamma-spinel to perovskite and magnesiowustite and the second is formed by the transition of ilmenite to perovskite.; Geosciences, Multidisciplinary; SCI(E); EI; 0; ARTICLE; 20; 33
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/156026]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zang, Shao-Xian,Zhou, Yuan-Ze,Ning, Jie-Yuan,et al. Multiple discontinuities near 660 km beneath Tonga area[J]. geophysical research letters,2006.
APA	Zang, Shao-Xian,Zhou, Yuan-Ze,Ning, Jie-Yuan,&Wei, Rong-Qiang.(2006).Multiple discontinuities near 660 km beneath Tonga area.geophysical research letters.
MLA	Zang, Shao-Xian,et al."Multiple discontinuities near 660 km beneath Tonga area".geophysical research letters (2006).