Editing Forearc (section)

==Structure==
At the surface, the forearc region can include a forearc basin(s), outer-arc high, accretionary prism and the trench itself.<ref name="Kearey et al. 2006" /> The forearc subduction interface can include a seismogenic zone, where megathrust earthquakes can occur, a decoupled zone, and a viscously coupled zone.<ref name=":0">{{cite journal |last1=Wada |first1=Ikuko |last2=Wang |first2=Kelin |last3=He |first3=Jiangheng |last4=Hyndman |first4=Roy D. |title=Weakening of the subduction interface and its effects on surface heat flow, slab dehydration, and mantle wedge serpentinization |journal=Journal of Geophysical Research |date=2 April 2008 |volume=113 |issue=B4 |doi=10.1029/2007JB005190|bibcode=2008JGRB..113.4402W }}</ref><ref>{{cite journal |last1=Peacock |first1=Simon M. |title=Advances in the thermal and petrologic modeling of subduction zones |journal=Geosphere |date=1 August 2020 |volume=16 |issue=4 |pages=936–952 |doi=10.1130/GES02213.1|bibcode=2020Geosp..16.1647P |doi-access=free }}</ref>

The accretionary prism is located at the slope of the trench break where there is significantly decreased slope angle. Between the break and the magmatic arc, a sedimentary basin filled with erosive material from the volcanic arc and substrate can accumulate into a forearc basin which overlays the oldest thrust slices in the wedge of the forearc region.<ref name="Kearey et al. 2006" />

In general, the forearc topography (specifically in the trench region) is trying to achieve an equilibrium between buoyancy and tectonic forces caused by subduction. Upward motion of the forearc is related to buoyancy forces and the downward motion is associated with the tectonic forcing which causes the oceanic lithosphere to descend.<ref name="Kearey et al. 2006" /> The relationship between surface slope and subduction thrust also plays a huge role in the variation of forearc structure and deformation.<ref name="Fuller et al. 2006" /> A subduction wedge can be classified as either stable with little deformation or unstable with pervasive internal deformation (see section on Models). Some common deformation in forearc sediments are [[Synsedimentary fold|synsedimentary deformation]] and [[olistostrome]]s, such as that seen in the [[Magnitogorsk]] forearc region.<ref name="Brown and Spadea 1999" />