幌筵岛最近一次火山活动是发生在2008年奇库拉·奇基锥顶，地处沿岛海岸北部，画面中上侧。
The most recent volcanic activity on Paramushir island occurred in 2008 at the Chikurachki cone located along the northern coastline of the island at image top center.
而其东西两侧的地方高达1000米(3000英尺)，有海拔很高的火山锥点缀在边缘。
The surrounding land rises to 1, 000 meters (3, 000 feet) east and west of the valley, and high-elevation, volcanic cinder cones dot the rim.
在海沟后侧的弧后盆地的火山中，此处是一个板块俯冲到另一板块的地方，也发现了该类通道，。
They are also found in volcanic “back-arc” basins behind ocean trenches, where one tectonic plate is sliding beneath another.
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