Indonesia Issues Tsunami Warning After 6.8 Quake Temblor struck off Papua New Guinea By Newser Editors and Wire Services Posted Jul 18, 2010 10:05 AM CDT 2 comments Comments A 6.8 earthquake has hit Indonesia, triggering a tsunami warning. (AP Photo/Fauzan Ijazah) (Newser) – Indonesia says it issued a tsunami warning after a powerful quake hit off Papua New Guinea. The US Geological Survey says the quake had a preliminary magnitude of 6.8 and was centered 325 miles northeast of the capital, Port Morseby. It struck 31 miles beneath the ocean floor. Fauzi, an official with Indonesia's geological agency, says his country issued a tsunami warning after the quake.