Anime Aleutian Island Arc Plate Boundary Free Download
At its widest point the trench is 50 to 100 miles across. The pacific plate subducts northwest relative to the north america plate at the aleutian trench south of the november 17th earthquake at a velocity of about 66 mm yr in the arc s eastern region where convergence is.
This process has created the aleutian arc.
Aleutian island arc plate boundary. The ring of active volcanoes volcanic arcs including the aleutian islands at the top and tectonic plate boundaries that frame the pacific ocean. An island arc is a unique type of island chain mostly made up of clusters of volcanoes through an arc shaped arrangement situated close and parallel to the boundary between two converging tectonic plates. North of the trench a string of volcanoes and associated islands have formed where melting of the crust has been caused by the descending plate beneath them.
Here the pacific plate is being subducted under the north american plate at a dip angle of nearly 45. All chains of volcanoes are not island arcs and all island arcs are not islands. The aleutian subduction zone includes two prominent features the aleutian arc and the aleutian trench.
Even more impressive is the tremendous depth of the aleutian trench which reaches a maximum depth of more than 26 000 feet. Extending alaska s plate boundary. However there is no evident geological structure marking the northern boundary.
Kasatochi is a remote island forming the peak of a mostly submerged stratovolcano rising to 314 m a s l. In the aleutian island chain. The aleutian subduction zone is a 2500 mile long convergence boundary between the north american plate and the pacific plate that extends from the alaska range to the kamchatka peninsula.
Tectonic tremor generated by yakutat subduction. The deepest part of the aleutian trench has been measured at 7 822 metres 25 663 ft at 51 21 n 174 83 e located about 145 km ssw of buldir island. The aleutian islands an island arc off the alaskan coast.
It is one of the volcanoes in the world that formed new islands in historic times. Therefore the aleutian arc west of 173 e is not a typical region for uncovering the factor controlling island arc magma production rates and thus 173 e is taken as the western boundary of our study region. Here the pacific plate is being subducted underneath the north american plate and the rate of subduction changes from west to east from 7 5 cm yr to 5 1 cm yr.
The southern boundary of the arc is the aleutian trench. The tectonics of the eastern end of the alaska aleutian subduction zone are complicated by the inclusion of the yakutat microplate which is colliding into and subducting beneath continental north america at near pacific plate rates. The aleutian islands form a segment of the circum pacific chain of volcanoes often called the ring of fire and represent a partially submerged continuation of alaska s aleutian range.
The hawaiian islands have a chain of linear volcanoes at the center of the pacific ocean which is not island arc. The island arc was created via volcanic erupt. The aleutian trench which has formed along the convergent boundary and has been produced by the subduction of the oceanic plate extends for 2 000 miles.
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. The rate of closure is 7 5 centimetres 3 in per year.
The november 17 2003 m 7 8 rat islands earthquake occurred as the result of shallow thrust faulting on or near the plate interface between the overriding north america plate and the subducting pacific plate along the subduction zone defining the aleutian arc of alaska.
