气候变化领域集成服务门户(CCPortal): Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea

CCPortal

DOI	10.1016/j.tecto.2017.12.030
	Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea
	Wang, Xiaoran; Li, Qiusheng; Li, Guohui; Zhou, Yuanze; Ye, Zhuo; Zhang, Hongshuang
通讯作者	Li, QS (通讯作者)
发表日期	2018
ISSN	0040-1951
EISSN	1879-3266
起始页码	28
结束页码	40
卷号	727
英文摘要	We provided a new study of the seismic velocity structure of the mantle transition zone (MTZ) beneath the northeastern South China Sea using P-wave triplications from two earthquakes at the central Philippines recorded by the Chinese Digital Seismic Network. Through fitting the observed and theoretical triplications modeled by the dynamic ray tracing method for traveltimes, and the reflectivity method for synthetic waveforms using grid-searching method, best-fit velocity models based on IASP91 were obtained to constrain the P-wave velocity structure of the MTZ. The models show that a high-velocity anomaly (HVA) resides at the bottom of MTZ. The HVA is 215 km to 225 km thick, with a P-wave velocity increment of 1.0% between 450 km and 665 km or 675 km transition and increase by 2.53.5% at 665 km or 675 km depth. The P-wave velocity increment ranges from approximately 0.3% to 0.8% below the 665 km or 675 km. We proposed that the HVA in the MTZ was caused by the broken fragments of a diving oceanic plate falling into the MTZ at a high angle, and/or by unstable thick continental lithosphere dropping into the MTZ sequentially or almost simultaneously.
关键词	660 KM DISCONTINUITY HIGH-VELOCITY ANOMALIES MANTLE TRANSITION ZONE STAGNANT SLAB REFLECTIVITY METHOD TRAVEL-TIMES ASIA COMPUTATION INVERSION MARGIN
英文关键词	P-wave triplication; Mantle transition zone (MTZ); High-velocity anomaly (HVA); Vanished plate subduction; Northeastern South China Sea
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000428826200003
来源期刊	TECTONOPHYSICS
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/259166
推荐引用方式 GB/T 7714	Wang, Xiaoran,Li, Qiusheng,Li, Guohui,et al. Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea[J]. 中国科学院青藏高原研究所,2018,727.
APA	Wang, Xiaoran,Li, Qiusheng,Li, Guohui,Zhou, Yuanze,Ye, Zhuo,&Zhang, Hongshuang.(2018).Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea.TECTONOPHYSICS,727.
MLA	Wang, Xiaoran,et al."Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea".TECTONOPHYSICS 727(2018).