A new western edifice was constructed on top of the Soncor vent, during the The volcano experienced at least three major eruptions throughout its history: One is the Soncor eruption about 26,450 ± 500 years ago, another in 7,250 Of these volcanic zones, the Central Volcanic Zone of which Lascar is a member ofThe volcanism of Lascar relates to the subduction of the The new town of Talabre is 17 kilometres (11 mi) west of Lascar. It is composed of two separate cones with several summit craters.
The western edifice generated a complex of lava domes (stage II),The stage II activity was accompanied by the eruption of A major Plinian eruption occurred 26,450 ± 500 years ago,The Soncor ignimbrite extended as much as 27 kilometres (17 mi) west from the volcano,Ignimbrite was channeled to the Salar de Atacama by the Quebrada de Chaile, Quebrada de Soncor and Quebrada de Talabre canyons and some smaller valleys, northeastwards by the Quebrada de Morro Blanco and as far as 11 kilometres (6.8 mi) southeastwards over the Pampa Leija area.The magma erupted was generated in a magma chamber starting from andesite, which underwent complex petrogenetic processes.A volatile phase containing chlorine formed inside the magma chamber and quickly removed most sulfur from the magma. Volcanic activity at Lascar affects neighbouring ecosystems such as the Aguas Calientes Lascar is the most active volcano in the Andean Central Volcanic Zone,The oldest volcanic activity at Lascar occurred between 220,000Lava flows less than 50 metres (160 ft) thick issued from the stage I cone and reached lengths of 16 kilometres (9.9 mi). The chamber may be surrounded by There are high-temperature fumaroles (temperatures equal to or exceeding 150 °C (302 °F)) and low-temperature fumaroles (temperatures of less than 82 °C (180 °F)), with noticeable chemical differences between the two; the latter tend to emit far more Gases are partly supplied from shallow magma; the volume of magma erupted is too small to contain all the exhalations.The heat output of Lascar is about 75–765 megawatts (71,000–725,000 BTU/s) during regular activity,Lascar rests atop the Atana ignimbrite, a rhyodacitic sheet which was erupted by La Pacana caldera 4.5–3.7 million years ago.The area around Lascar is one of the driest and highest volcanic settings in the world.Temperatures in the surrounding region range between −25 and 40 °C (−13 and 104 °F).Due to the dry climate, there is little vegetation at Lascar. À l'époque, l'activité volcanique se situait au niveau du cône occidental et a donné naissance à trois cratères . 16 km altitude) and was visible from the El Abra cooper mine 220 km NW of the volcano. A more powerful eruption occurred on 4 May, producing an ash column that reached a height of 11 km and caused fine ash fall in the city of Salta located 285 km SSE of the volcano. Other volcanic centres are also located on this line,Lascar rocks consist of andesite and dacite. Weak eruptions, characterized by earthquakes and the release of plumes, occurred in February–March 2012 and March–April 2013.Because of the volcano's remote location, much information on its activity comes from Explosive eruptions and ash falls are the major threat to humans from Lascar.The Lascar volcano, seen from the Chaxas lagoon on the Gran Salar. It is the most active volcano in the region, with records of eruptions going back to 1848. This sulfur extraction was facilitated by the high The previous volcanic edifice was destroyed by this eruption,Activity subsequently shifted to the eastern edifice.Lascar has erupted about thirty times since the 19th century.A 200-metre-wide (660 ft) and 50-metre-high (160 ft) lava dome formed in early 1989.

Lascar is a stratovolcano within the Central Volcanic Zone of the Andes, a volcanic arc that spans the countries of Peru, Bolivia, Argentina and Chile. The flow deposit was later modified by The Quebrada Talabre cuts into the upper flanks of LascarThe volcano sits above a major local geological trend, the north–south Miscanti Line. It was emplaced after the collapse of the oldest edifice, covering Aguas Calientes' western slopes.

Lascar has been active since at least 56,000 years ago, though some argue for activity beginning 220,000 years ago. 10 km above the volcano (ca. 2006 April eruption An eruption at Lascar volcano started on 18 April 2006 and lasted 5 days. On 20 February 1990, an eruption column rose 8–14 kilometres (5.0–8.7 mi) above the crater,An alternating cycle of fumarolic activity, an accumulation of fumarolic gases in the conduit and lava dome, and The eruption columns underwent several collapses, creating pyroclastic flows at least seven to nine times.About 30% of these flows were formed by ash and 70% by blocks,There is a pronounced morphology characterized by a channel upslope and snout-like toes downslope.The flows were strongly erosive, extracting rocks and material from the bedrock, even far away from the vent.These flows took a long time to cool down; in the Quebrada Tumbres, they had not cooled down completely by December 1993.The ash from the volcano was carried by western wind towards Argentina and the This eruption was the most significant eruption of Lascar in the last 9,000 years, with a volcanic explosivity index of 4The people of Talabre were evacuated during the eruption to Toconao, although some ignored evacuation orders.

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