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The 1991 eruption of Mount Pinatubo in the Philippines' Luzon Volcanic Arc was the second-largest volcanic eruption of the 20th century, behind only the 1912 eruption of Novarupta in Alaska. Eruptive activity began on April 2 as a series of phreatic explosions from a fissure that opened on the north side of Mount Pinatubo .
The most recent study of Mount Pinatubo before the activities of 1991 was the overall geological study in 1983 and 1984 made by F. G. Delfin for the Philippine National Oil Company as part of the surface investigations of the area before exploratory drilling and well testing for geothermal energy sources in 1988 to 1990. He recognized two life ...
English: View to the west from Clark Air Base of the major eruption of Pinatubo on June 15, 1991. The June 15-16 climatic phase lasted more than fifteen hours, sent tephra 30-40 km into the atmosphere, generated voluminous pyroclastic flows, and left a caldera in the former summit region.
Lake Pinatubo (Filipino: Lawa ng Pinatubo) is the summit crater lake of Mount Pinatubo formed after its climactic eruption on June 15, 1991. The lake is located in the Zambales Mountains , in Botolan, Zambales , near the boundaries of Pampanga and Tarlac provinces in the Philippines .
On June 15, 1991, the island of Luzon in the Philippines was ground zero for the second-largest volcanic eruption of the 1900s when Mount Pinatubo blew its top. This historic natural event set ...
A before-and-after photograph of a river valley filled in by lahars from Mount Pinatubo. Lahars caused most of the deaths of the 1991 eruption of Mount Pinatubo. The initial eruption killed six people, but the lahars killed more than 1500.
File:Mapanuepe Lake-before & after.gif. ... English: The map of Mapanuepe Valley before the eruption of Mount Pinatubo and after the lake has formed. Date: 1991: Source:
Operation Fiery Vigil was the emergency evacuation of all non-essential military and U.S. Department of Defense civilian personnel and their dependents from Clark Air Base and U.S. Naval Base Subic Bay during the June 1991 eruption of Mount Pinatubo in the Republic of the Philippines.