<P> The Aleutian Trench ( or Aleutian Trough ) is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands . The trench extends for 3,400 km from a triple junction in the west with the Ulakhan Fault and the northern end of the Kuril -- Kamchatka Trench , to a junction with the northern end of the Queen Charlotte Fault system in the east . It is classified as a `` marginal trench '' in the east as it runs along the margin of the continent . The subduction along the trench gives rise to the Aleutian arc , a volcanic island arc , where it runs through the open sea west of the Alaska Peninsula . As a convergent plate boundary , the trench forms part of the boundary between two tectonic plates . Here , the Pacific Plate is being subducted under the North American Plate at a dip angle of nearly 45 ° . The rate of closure is 3 inches ( 76 mm ) per year . </P>
<P> The Aleutian Trench ( or Aleutian Trough ) is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands . The trench extends for 3,400 km from a triple junction in the west with the Ulakhan Fault and the northern end of the Kuril -- Kamchatka Trench , to a junction with the northern end of the Queen Charlotte Fault system in the east . It is classified as a `` marginal trench '' in the east as it runs along the margin of the continent . The subduction along the trench gives rise to the Aleutian arc , a volcanic island arc , where it runs through the open sea west of the Alaska Peninsula . As a convergent plate boundary , the trench forms part of the boundary between two tectonic plates . Here , the Pacific Plate is being subducted under the North American Plate at a dip angle of nearly 45 ° . The rate of closure is 3 inches ( 76 mm ) per year . </P>
what type of plate boundary is the aleutian islands
what type of plate boundary is the aleutian islands
convergent plate boundary
convergent plate boundary