[Island Chris]

There was a M6.4 quake with epicenter at an island offshore Padang, Sumatra, Indonesia. As usual, from memory, which is not what it was: there were some M8+ quakes in this area in 2005 and probably later. Back soon after those quakes, Kerry Sieh gave a special 1 hour talk at the AGU meeting and made the case that large areas of that subduction zone had not broken. For example, only the deep part of the zone had broken, not the shallow, or vice versa.

The USGS page does not yet have the focal mechanism.

Again, from memory, Padang may have a population of 1 million and they would be concerned about tsunamis.


http://earthquake.usgs.gov/earthquakes/e...al_summary

Chris

[Island Chris]

The focal mechanism is there now and it is thrust consistent with subduction.
Chris