Usually means: Zone behind volcanic arc, subduction-related.
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We found 4 dictionaries that define the word backarc:

General (2 matching dictionaries)
  1. backarc: Wiktionary
  2. Backarc: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Backarc: Encyclopedia

Science (1 matching dictionary)
  1. Earthquake Image Glossary (No longer online)

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Definitions from Wiktionary (backarc)

▸ noun:  (geology) The landward region of a volcanic chain, opposite the subduction zone.

Similar:
forearc, subarctic, subarch, anticenter, arch, arete, Arcadic, volcan, abyss, archicontinent, more...

Opposite:
forearc, volcanic arc

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Similar:
forearc, subarctic, subarch, anticenter, arch, arete, Arcadic, volcan, abyss, archicontinent, more...

Opposite:
forearc, volcanic arc



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