Okinawa ocean trough and Ryukyu island arc were formed in late Miocene.

中新世晚期，冲绳海槽和疏球岛弧形成。

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The marginal basins along the trough between different massifs or the marginal zone between massif and ocean trough are favorable for oil and gas generation.

地块之间的海槽或地块与海槽过渡的边缘带盆地是油气形成的有利地带。

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Woodside argues that an onshore plant would be both much more expensive and technically risky, entailing a pipeline through a “seismically active” 3km-deep ocean trough.

Woodside声称建设陆地平台的成本和技术风险要大得多，必然要铺设一条管道通过一个“地震频发”的3千米深海沟。

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Roughly 30 miles off the coast of Honshu Island in the Pacific Ocean, the Nankai Trough holds an estimated 40 trillion cubic feet of gas hydrates and has received the largest investment and advanced field research of any project in the world.

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