气候变化领域集成服务门户(CCPortal): Sedimentary Structure Derived From Multi-Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench

CCPortal

DOI	10.1029/2021JB021789
	Sedimentary Structure Derived From Multi-Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench
	Yamaya L.; Mochizuki K.; Akuhara T.; Nishida K.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	We derive the 3-D S-wave velocity structures of sediments and upper crust in the region off Ibaraki at Japan Trench subduction zone by applying ambient noise tomography to a dense array of short-period ocean bottom seismometers (OBSs). The cross-spectra were calculated using 27 or 142-day continuous seismic data, and the phase velocities of the fundamental and the first-higher Rayleigh wave modes are obtained in the frequency ranges of 0.1–0.25 Hz and 0.17–0.3 Hz, respectively. Our 1-D S-wave velocity inversion based on the trans-dimensional Markov chain Monte Carlo method revealed multiple sedimentary layers above the acoustic basement and the upper crustal structure. The 1-D structure was then used as a reference model to conduct ambient noise tomography and non-linear inversion of the 3-D S-wave velocity structure by collecting data of the local 1-D S-wave velocity structure. Our 3-D S-wave velocity structure revealed three main points: (a) The acoustic basement is situated at a depth of ∼4 km depth; (b) the crustal structure is more complex than that of the sedimentary layers; and (c) the southern region has a complex crustal structure in which subducting seamounts were identified by previous P-wave velocity tomographies. © 2021. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187082
作者单位	Earthquake Research Institute, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Yamaya L.,Mochizuki K.,Akuhara T.,et al. Sedimentary Structure Derived From Multi-Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench[J],2021,126(6).
APA	Yamaya L.,Mochizuki K.,Akuhara T.,&Nishida K..(2021).Sedimentary Structure Derived From Multi-Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Yamaya L.,et al."Sedimentary Structure Derived From Multi-Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench".Journal of Geophysical Research: Solid Earth 126.6(2021).