Incoming! Oblique Subduction at the Sunda Subduction Zone

Incoming! Oblique Subduction at the Sunda Subduction Zone

The Indian and Australian Plates plow northeast into the Sumatra subduction zone<, part of the larger Sunda subduction zone, at a speed of 45 mm/yr.  The angle between the direction these two plates move relative to each other is not always at a right angle (90°) to the subduction zone itself–here it is about 50°.  Sliding under the Sunda Plate at an angle is not easy, so several large strike-slip fault systems help to accommodate some…