Ok, so I made it to Rabaul. But check out this geologic feature of the southeast end of New Ireland. The map is from Plan-G, and the FS shot is where I think I'm over it. Turn out it's a seismic fault, called either the Weitin Fault or the Sapom Fault. They're both there, but my quick Google research did not make it clear to me which was the visually striking one. They do get big quakes around here...