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首页> 外文期刊>Earth, planets and space: EPS >Variation in crustal structure along the Kyushu-Palau Ridge at 15-21 degrees N on the Philippine Sea plate based on seismic refraction profiles
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Variation in crustal structure along the Kyushu-Palau Ridge at 15-21 degrees N on the Philippine Sea plate based on seismic refraction profiles

机译：基于地震折射剖面，菲律宾海板上北九州-帕劳岭沿北风15-21度的地壳结构变化

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摘要

We acquired coincident wide-angle and multi-channel seismic reflection data along four profiles perpendicular to the Kyushu-Palau Ridge (KPR) between 15 degrees N and 20 degrees N on the Philippine Sea plate. The crustal thickness beneath the KPR, which is a remnant arc created in the Late Eocene, varies along the strike from 8 to approximately 20 km and is always thicker than the adjacent oceanic crust of the West Philippine Basin to the west and the Parece Vela Basin to the east. The thickest crust among the four profiles, which is primarily due to a thickening of the lower crust, is found where the KPR adjoins Oki-no-Tori-Shima Island. There is no clear evidence of the thick (>5 km) middle crustal layer with a P-wave velocity of 6.0-6.5 km/s that has been inferred beneath the conjugate rifted counterpart of the Izu-Ogasawara(Bonin)-Mariana Island-arc. Our results suggest that the crust of the KPR at 15-21 degrees N represents a less mature island arc crust relative to that further north along the ridge where a mid-crustal layer of 6 km/s has been reported.
机译：我们在菲律宾海板上沿着与九州-帕劳岭（KPR）垂直的四个剖面在北纬15度和北纬20度之间获取了一致的广角和多通道地震反射数据。 KPR下方的地壳厚度是始新世晚期形成的残余弧，沿走向从8到大约20 km变化，并且始终比西菲律宾盆地西部和Parece Vela盆地的相邻洋壳厚向东。在KPR靠近冲之鸟岛岛的地方发现了这四个剖面中最厚的地壳，这主要是由于下地壳的增厚。没有明显的证据表明，伊豆-小ara原（波宁）-马里亚纳岛-的共轭裂谷对应物下方有厚的（> 5 km）地壳，P波速度为6.0-6.5 km / s。弧。我们的结果表明，KPR的地壳在15-21度N处代表的岛弧形地壳相对于沿山脊更北（据报道中壳层为6 km / s）而言不那么成熟。

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