火山弧（volcanic arc）是火山作用形成的岛弧。板块俯冲过程形成的一串火山，从上看其外形像个弧。是在海洋中呈线形分布的列岛。它们大多数位于大陆与大洋的境界地带。
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其构造环境主要为火山弧地区。
大坂山矿带在早古生代由一个火山弧和陆缘海槽演化而来。
The ore zone of Daiban mountain has evolved from an epicontinentaloceanic trough and a volcanic island-arc during early paleozoic time.
从滑坡体与周围地层的叠置关系及火山弧喷发的历史来看，初步认为该海底滑坡是地震造成的。
From the relationship between the landslide area and the surrounding stratum and the history of the volcano eruption, it is suggested that the submarine landslide is triggered by the earthquake.
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