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	Crustal and uppermost mantle S-wave velocity structure beneath the Japanese islands from seismic ambient noise tomography
	Guo Z. ; Gao X. ; Shi H. ; Wang W. M.
	2013
关键词	Interferometry Surface waves and free oscillations Seismic tomography Crustal structure receiver function-analysis subduction zone southwest japan arc magmatism dispersion measurements 2-station analysis array tomography deep-structure surface-waves fore-arc
英文摘要	In this study, the crustal and uppermost mantle shear wave velocities beneath the Japanese islands have been determined by inversion from seismic ambient noise tomography using data recorded at 75 Full Range Seismograph Network of Japan broad-band seismic stations, which are uniformly distributed across the Japanese islands. By cross-correlating 2 yr of vertical component seismic ambient noise recordings, we are able to extract Rayleigh wave empirical Green's functions, which are subsequently used to measure phase velocity dispersion in the period band of 6-50 s. The dispersion data are then inverted to yield 2-D tomographic phase velocity maps and 3-D shear wave velocity models. Our results show that the velocity variations at short periods (similar to 10 s), or in the uppermost crust, correlate well with the major known surface geological and tectonic features. In particular, the distribution of low-velocity anomalies shows good spatial correlation with active faults, volcanoes and terrains of sediment exposure, whereas the high-velocity anomalies are mainly associated with the mountain ranges. We also observe that large upper crustal earthquakes (5.0 <= M <= 8.0, depth <= 25 kin) mainly occurred in low-velocity anomalies or along the boundary between low- and high-velocity anomalies, suggesting that large upper crustal earthquakes do not strike randomly or uniformly; rather they are inclined to nucleate within or adjacent to low-velocity areas.
出处	Geophysical Journal International
卷	193
期	1
页	394-406
收录类别	SCI
语种	英语
ISSN号	0956-540X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30532]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Guo Z.,Gao X.,Shi H.,et al. Crustal and uppermost mantle S-wave velocity structure beneath the Japanese islands from seismic ambient noise tomography. 2013.

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