Three major eruptions of Lascar are known to have occurred: one more than 26,500 years ago, another about 26,450 ± 500 years ago, and a third in 7,250 BCE . The second of these eruptions released 10–15 cubic kilometres (– cu mi) of material and is known as the Soncor eruption. The largest eruption of Lascar known to recorded history occurred in April 1993 and was accompanied by ash fall as far away as Buenos Aires . Because Lascar is located in a remote area, it is monitored primarily by remote sensing . Explosive eruptions are the greatest hazard at Lascar.