Sunda megathrust

The Sunda megathrust is a fault that extends approximately 5,500 km (3300 mi) from Myanmar (Burma) in the north, running along the southwestern side of Sumatra, to the south of Java and Bali before terminating near Australia.

The relative motion of the subducting and overriding plates varies slightly along strike due to these complexities but is always strongly oblique.

The Sunda megathrust is curviplanar, forming an arc in map view and, at least in Sumatra, increasing in dip from 5°-7° near the trench, then increasing gradually from 15°-20° beneath the Mentawai Islands to about 30° below the coastline of Sumatra.

[3] The Java-Bali segment of the megathrust does not appear to be associated with great earthquakes, possibly due to mainly aseismic slip.

[4] This table lists Sunda Megathrust quakes with magnitudes of 7 or greater, or any known to have caused deaths.

Variation of seismicity with depth across the Sunda Trench subduction zone, low-angle part is the Sunda megathrust – 2007 Bengkulu earthquakes mainshock shown by star
Plate tectonic setting of Sunda megathrust
Rupture areas for the 1861, 1833 and 2004 earthquakes and area of main shock and aftershocks for the 2005 event, showing similarity to 1861 quake