Another 18 years passed before Cerro Negro erupted again, but on July 9, 1947 the volcano had its largest eruption to date. The VEI was recorded at 3 along the summit and NE flank, with the eruptive characteristics including central vent eruption, flank venting, and lava flows. Evacuations were called for the Malpaisillo village, and major land and property damage resulted from the volcano's explosive eruptions. The recorded lava volume was 3.8 x 106 m3 and the recorded tephra volume was 3.1 x 107 m3.
