A forebulge is a geological feature that occurs in the context of tectonic plate movements and the consequent loading and unloading of the Earth's crust. It refers specifically to a raised area or bulge in the Earth's surface that forms in front of a trench or subduction zone. This phenomenon is often associated with the flexural response of the lithosphere (the rigid outer layer of the Earth) to the weight of sediments being deposited in nearby oceanic trenches or as a result of tectonic stress.
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