SANTIAGO) - An earthquake with a preliminary magnitude of 7.7 struck 225 km southwest of Puerto Montt in southern Chile on Sunday, the United States Geological Survey said. A tsunami warning was issued for areas within 1,000 km of the epicenter of the quake, the US-based Pacific Tsunami Warning Center said. The Chilean Navy also issued a tsunami warning. The quake's depth was about 15 km (nine miles). Chile has a long history of deadly quakes, including a 8.8 magnitude quake in 2010 off the south-central coast, which also triggered a tsunami that devastated coastal towns.