A forearc is the region between an oceanic trench and the associated volcanic arc. As such, forearc regions are found at convergent margins, and include any accretionary wedge and forearc basin that may be present. Due to tectonic stresses as on tectonic plate rides over another, forearc regions are sources for great thrust earthquakes ==Formation...
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http://en.wikipedia.org/wiki/Forearc
forearc. The region between the subduction zone and the volcanic chain (volcanic arc).
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http://www.encyclo.co.uk/local/21456
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