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In geology , epeirogenic movement -LRB- from Greek epeiros , land , and genesis , birth -RRB- is upheavals or depressions of land exhibiting long wavelengths and little folding apart from broad undulations .. geology. geology. folding. fold ( geology ). The broad central parts of continents are called cratons , and are subject to epeirogeny .. cratons. cratons. The movement may be one of subsidence toward , or of uplift from , the centre of the Earth .. The movement is caused by a set of forces acting along an Earth radius , such as those contributing to isostasy and faulting in the lithosphere .. isostasy. isostasy. faulting. Fault ( geology ). lithosphere. lithosphere. Epeirogenic movement can be permanent or transient .. Transient uplift can occur over a thermal anomaly due to convecting anomalously hot mantle , and disappears when convection wanes .. mantle. Mantle ( geology ). Permanent uplift can occur when igneous material is injected into the crust , and circular or elliptical structural uplift -LRB- that is , without folding -RRB- over a large radius -LRB- tens to thousands of km -RRB- is one characteristic of a mantle plume .. folding. fold ( geology ). mantle. Mantle ( geology ). crust. crust ( geology ). mantle plume. mantle plume. In contrast to epeirogenic movement , orogenic movement is a more complicated deformation of the Earth 's crust , associated with crustal thickening , notably associated with the convergence of tectonic plates .. crust. crust ( geology ). orogenic movement. orogeny. tectonic plates. tectonic plates. Such plate convergence forms orogenic belts that are characterized by `` the folding and faulting of layers of rock , by the intrusion of magma , and by volcanism '' .. folding. fold ( geology ). faulting. Fault ( geology ). orogenic belts. Orogeny