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.