Seismic activity in these regions occurs in (*) Wadati-Benioff zones, where megathrust earthquakes can occur due to significant accumulation of stress.
A type of rock containing a high yttrium to strontium ratio known as adakite can form in the flat-slab type of these regions. A force affecting these regions contains a term equal to 4.2 times acceleration due to gravity and is known as slab pull. The emplacement of ophiolites is a result of the formation of back-arc basins in these regions. Seismic activity in these regions occurs in (*) Wadati-Benioff zones, where megathrust earthquakes can occur due to significant accumulation of stress. A large example of these regions forms the boundary between the North American and Juan de Fuca plates and is the Cascadian one of these regions. For 10 points, name these convergent plate boundaries where one plate sinks under another.
A type of rock containing a high yttrium to strontium ratio known as adakite can form in the flat-slab type of these regions.
subduction zones [prompt on “plate boundaries” or “convergent boundaries” until read]