There have been numerous historical eruptions since the 16th century, both at the summit and from cinder cones on the lower flanks, and also the flank vents of San Marcelino located east of Santa Ana.
There have been numerous historical eruptions since the 16th century, both at the summit and from cinder cones on the lower flanks. Such flank eruptions created the volcanoes Izalco and Cerro Verde (both parasitic volcanoes) and also the flank vents of San Marcelino located east of Santa Ana.