Indonesian Plate Boundary Activity, from Pitt T. Maner III
Tectonic activity along the Indo-Australian and Eurasian (Sunda/Java Trench portion?) plates may bear watching in light of tsunami and eruptive Merapi phases. Very dangerous volcanoes and faults in this area :
The signs were all there that Merapi was headed towards a new eruptive phase and today at ~6 PM (local time in Indonesia), Merapi erupted. This is a double (possibly triple) whammy for Indonesia that is suffering after a M7.7 earthquake off Sumatra that generated a tsunami as well. The Indonesia government has their work cut out for them as they try to evacuate over 50,000 people from the slopes and nearby region around.