文章基本信息

标题：Backarc basin oceanic crust and uppermost mantle seismic velocity structure of the Shikoku Basin, south of Japan
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作者：Azusa Nishizawa ; Kentaro Kaneda ; Mitsuhiro Oikawa 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2011
卷号：63
期号：2
页码：151-155
DOI：10.5047/eps.2010.12.003
出版社：Springer Verlag
摘要：Seismic refraction and reflection measurements were made along three profiles across the Shikoku Basin, one of the three backarc basins on the Philippine Sea plate.The P -wave velocity models show the presence of a very large horizontal irregularity related to the seamounts on the extinct spreading center, transition zones from the Shikoku Basin to Kyushu-Palau Ridge, and from the Shikoku Basin to the Izu-Ogasawara Island arc.However, the other areas were found to have features similar to those of a normal oceanic crustal model composed of oceanic Layer 2 with a high velocity gradient and Layer 3 with a small velocity gradient.The Shikoku backarc basin oceanic crust was found to be characterized by a thinner igneous crust, especially in Layer 3, and the azimuthal anisotropy in the uppermost mantle expected from the seafloor spreading was not detected. Key words Shikoku Basin backarc basin oceanic crust and mantle marine seismics.
关键词：Shikoku Basin ;backarc basin oceanic crust and mantle ;marine seismics