How big was the eruption of Mt Pinatubo?
Mt. Pinatubo is a stratovolcano in the Philippines. June 12, 1991, it erupted, resulting in the second-largest eruption of the 20th century. The ash plume height reaching more than 40 km (28 mi) high and ejecting more than 10 km3 of magma, classifying it as plinian/ultra plinian eruption style and VEI 6 in eruption size.
What kind of magma is found on Mount Pinatubo?
Four principal juvenile magmatic components are present in the 1991 deposits of Mount Pinatubo: hybrid andesite (59-60 weight percent SiO 2 ), olivine-clinopyroxene basalt (50-52 weight percent SiO 2) with abundant hornblende microphenocrysts, and phenocryst-rich and phenocryst-poor dacite (both 64.5+-0.3 weight percent SiO 2 ).
How tall was the ash plume from Pinatubo?
The ash plume height reaching more than 40 km (28 mi) high and ejecting more than 10 km 3 of magma, classifying it as plinian /ultra plinian eruption style and VEI 6 in eruption size.
Where are Mount Negron and Mount Pinatubo located?
Pinatubo belongs to the Cabusilan sub-range of the Zambales Mountains, which consists of Mount Cuadrado, Mount Negron, Mount Mataba and Mount Pinatubo. They are subduction volcanoes, formed by the Eurasian Plate sliding under the Philippine Mobile Belt along the Manila Trench to the west.
Where is Mt. Pinatubo located?
Mount Pinatubo. Mount Pinatubo is a volcano located on the island of Luzon in the Philippines. Nestled in the central part of the Zambales mountain range, the volcano lies 55 miles northwest of the capital city of Manila.
Is the Mount Dorst part of the Pinatubo volcano?
Ancestral Pinatubo is a somma volcano with modern Pinatubo as the new cone. Mount Dorst, to the east, is part of the dip slope of the ancestral Pinatubo. Several mountains near modern Pinatubo are old satellite vents of ancestral Pinatubo, forming volcanic plugs and lava domes.
How did Mount Pinatubo affect the stratosphere?
Pinatubo injected about 15 million tons of sulfur dioxide into the stratosphere, where it reacted with water to form a hazy layer of aerosol particles composed primarily of sulfuric acid droplets. Over the course of the next two years strong stratospheric winds spread these aerosol particles around the globe.
How did people save lives during Mount Pinatubo eruption?
Timely forecasts of this eruption by scientists from the Philippine Institute of Volcanology and Seismology and the U.S. Geological Survey enabled people living near the volcano to evacuate to safer distances, saving at least 5,000 lives.
Where did Pinatubo inject sulfuric acid into the atmosphere?
The stratosphere is the layer of atmosphere extending from about 10 km to 50 km (6-30 miles) in altitude. Pinatubo injected about 15 million tons of sulfur dioxide into the stratosphere, where it reacted with water to form a hazy layer of aerosol particles composed primarily of sulfuric acid droplets.
Who are the Aeta people of Pinatubo mountain?
The forested area of Pinatubo mountain was also known as home for a tribe of the Aeta people,- the small, dark skinned, and kinky haired people believed to be the nearest descendants of the original inhabitants of the Philippines, who arrived through land bridges that linked the Philippines with the Asian mainland some 30,000 years ago.
What was the most recent study 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.