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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 ...
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 .
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 .
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.
Mapanuepe lake is located at the confluence of Marella and Mapanuepe Rivers as the two rivers merge to become the Santo Tomas River. The subsequent rains following the 1991 eruption of Mount Pinatubo produced lahar that dumped volcanic debris on the Marella River, one of the major drainages of the mountain, aggrading the river that eventually dammed the Mapanuepe River.
The eruption is believed to have contributed to the accumulation of atmospheric ash, [citation needed] capped by the catastrophic eruption of Mount Tambora in 1815, that led to the Year Without a Summer in 1816. Pinatubo eruption: 1500 to 2021: Reawakened in 1991 producing the 2nd largest eruption in the 20th century.
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:
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.