pressure release

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The expansion of a rock formed under pressure when that pressure is released (also known as dilatation). A glacier may remove the overburden, and the revealed rock ‘bursts’ open; see the classic Lewis (1954) J. Glaciol. 2. Twidale (1973) Rock Mech. & Rock Eng. 5, 3 attributes sheet jointing to pressure release.

Subjects: Earth Sciences and Geography.

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