<P> A 2 - km - wide postglacial caldera is located at the base of the presently active, dominantly basaltic - to - andesitic cone at the northwest margin of the Pleistocene caldera . About 25 scoria cones dot Villarica's flanks . Plinian eruptions and pyroclastic flows have been produced during the Holocene from this dominantly basaltic volcano, but historical eruptions have consisted of largely mild - to - moderate explosive activity with occasional lava effusion . Lahars from the glacier - covered volcanoes have damaged towns on its flanks . </P> <P> The Llaima Volcano is one of the largest and most active volcanoes in Chile . It is situated 82 km northeast of Temuco and 663 km southeast of Santiago, within the borders of Conguillío National Park . Llaima's activity has been documented since the 17th century, and consists of several separate episodes of moderate explosive eruptions with occasional lava flows . The last major eruption occurred in 1994 . </P> <P> Chile has experienced numerous volcanic eruptions from 60 volcanoes, including Llaima Volcano and the Chaitén Volcano . More recently, a magnitude - 8.8 earthquake struck central Chile on February 27, 2010, the Puyehue - Cordón Caulle volcano erupted in 2011, and a M8. 2 earthquake struck northern Chile on April 1, 2014 . The main shock was preceded by a number of moderate to large shocks and was followed by a large number of moderate to very large aftershocks, including a magnitude - 7.6 event on 2 April . </P> <P> Lascar is a stratovolcano, is the most active volcano of the northern Chilean Andes . The largest eruption of Lascar took place about 26,500 years ago, and following the eruption of the Tumbres scoria flow about 9,000 years ago, activity shifted back to the eastern edifice, where three overlapping craters were formed . Frequent small - to - moderate explosive eruptions have been recorded from Lascar in historical time since the mid-19th century, along with periodic larger eruptions that produced ash and tephra fall up to hundreds of kilometers away from the volcano . The largest eruption of Lascar in recent history took place in 1993, producing pyroclastic flows as far as 8.5 km (5 mi) northwest of the summit and ash fall in Buenos Aires, Argentina, more than 1,600 km (994 mi) to the southeast . The latest series of eruptions began on 18 April 2006 and was continuing as of 2011 . </P>

Describe the ring of fire and the volcanoes formed there