There was a period of activity from 1965 to 1977 with the area of activity concentrated in the vicinity of Mount Tabaro. The 1965 eruption was classified as phreatomagmatic, generated by the interaction of magma with the lake water that produced the violent explosion that cut an embayment on Volcano Island. The eruption generated cold base surges which travelled several kilometers across Lake Taal, devastating villages on the lake shore and, killing about a hundred people.