Puyehue Volcano Eruption, Andes, Chile

• 1921–1922, 1929 and 1934 eruptions
On December 13, 1921, Cordón Caulle began a sub-plinian eruption, with a 6.2 kilometres (4 mi) high plume, periodic explosions and seismicity. The eruption had a Volcanic Explosivity Index of 3 and ended on February 1922. In 1929 and 1934 the Cordón Caulle had fissure eruptions, both with an estimated Volcanic Explosivity Index of 2.
• 1960 eruption
On May 24, 1960, 38 hours after the main shock of the 1960 Valdivia earthquake, the largest earthquake recorded in history, Cordón Caulle began a rhyodacitic fissure eruption. The earthquake had struck the whole of Chile between Talca (30°S) and Chiloé (43°S) and had an estimated moment magnitude of 9.5. Being located between two sparsely populated and by then isolated Andean valleys the eruption had few eyewitnesses and received little attention by local media due to the huge damages and losses caused by the main earthquake. The eruption was fed by a 5.5 kilometres (3 mi) long and north west-west (N135°) trending fissure along which 21 individual vents have been found. These vents produced an output of about 0.25 cubic kilometres (202,678 acre·ft) DRE both in form of lava flows and tephra.