Just got an email from the USGS saying:
A magnitude 6.8 earthquake IN THE BOUGAINVILLE REGION, P.N.G. has occurred at: 6.77S 155.47E Depth 54km Fri Sep 1 10:18:53 2006 UTC
There’s a USGS page for this quake with more details. The map is cached below (because it will expire over time), click on it for the current map.