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Figure F2. Location map of Philippine Sea region. The Izu-Bonin-Mariana (IBM) arc trench system forms the convergent boundary between the Pacific and Philippine Sea plates. Back-arc basins such as Shikoku Basin, Parece Vela Basin, and Mariana Trough were created by seafloor spreading between the formerly contiguous remnant arc (Kyushu-Palau and West Mariana Ridges).

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