Revisiting Sunda Subduction: Possible Implications for Earthquake Activity

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Was there slippage overlapping with same previous slippage? First time? Sumatra has no volcanoes, so water is not released from slab. might water act as lubricant; hence facilatating unprecedented following large earthquake?
 

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cph said:
Was there slippage overlapping with same previous slippage? First time? Sumatra has no volcanoes, so water is not released from slab. might water act as lubricant; hence facilatating unprecedented following large earthquake?
The first two questions are unclear. The Sunda Subduction is basically where the Australia Plate is pushing into the Eurasia (Asia) Plate.

Is this a reference to the recent earthquake - Magnitude 7.2 - NORTHERN SUMATRA, INDONESIA, 09 May 2010 05:59:42 UTC?

There are plenty of volcanos on Sumatra, but most are not active - not like those on Java.
http://www.volcano.si.edu/world/region.cfm?rnum=0601

Marapi (not Merapin on Java) was last active during 2004.
http://www.volcano.si.edu/world/volcano.cfm?vnum=0601-14=

Talang was active during 2007
http://www.volcano.si.edu/world/volcano.cfm?vnum=0601-16=

Java certainly has more volcanic activity currently than Sumatra.
http://www.volcano.si.edu/world/region.cfm?rnum=0603
http://www.volcano.si.edu/world/volcano.cfm?vnum=0603-25= Merapi
http://www.volcano.si.edu/world/volcano.cfm?vnum=0603-30= Semeru (currently active)