Qualla: Mount Pinatubo

Mount Pinatubo: Introduction

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Chester Lacson Sigua, CC BY-SA 3.0. Before 1991, most Filipinos could not have picked Mount Pinatubo out of a lineup. Standing only about 200 meters higher than its neighboring peaks in the Zambales range, cloaked in dense forest and home to indigenous Aeta communities who had lived on its slopes for centuries, it barely registered as a volcano at all. Then, on June 15, 1991, Pinatubo produced the second-largest terrestrial eruption of the 20th century, ejecting ten cubic kilometers of magma, lowering global temperatures by half a degree Celsius, and replacing its own summit with a caldera now filled by a turquoise lake. The mountain that nobody noticed changed the climate of the entire world.

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Image: Chester Lacson Sigua | CC BY-SA 3.0

Mount Pinatubo: The Mountain Nobody Knew

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Ramon FVelasquez, CC BY-SA 3.0. At 1,745 meters above sea level, Pinatubo had little topographic prominence. Dense forests obscured its slopes, and the surrounding peaks of the Cabusilan sub-range hid it from most vantage points. It sits about 87 kilometers northwest of Manila, on the tripoint where Zambales, T...

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Image: Ramon FVelasquez | CC BY-SA 3.0

Mount Pinatubo: Black Saturday

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit United States Geological Survey, Public domain. Warning signs began in March 1991, when magma rising from more than 32 kilometers below triggered thousands of small earthquakes and steam explosions that blasted three new craters on the north flank. Sulfur dioxide poured from the vents. Scientists from the Philippine Institute ...

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Image: United States Geological Survey | Public domain

Mount Pinatubo: A World Turned Cold

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Ramon FVelasquez, CC BY-SA 3.0. The eruption's consequences reached far beyond Luzon. Pinatubo ejected more particulate matter into the stratosphere than any eruption since Krakatoa in 1883. Aerosols formed a global layer of sulfuric acid haze that circled the planet. Global temperatures dropped by about 0.5 de...

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Image: Ramon FVelasquez | CC BY-SA 3.0

Mount Pinatubo: Spirit of the Mountain

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Emman Asuncion Foronda, CC BY-SA 4.0. The Aeta people call the mountain the abode of Apo Namalyari, the Lord of Happenings, a deity revered by the Sambal, Aeta, and Kapampangan peoples of the Zambales range. An ancient legend tells of Bacobaco, a spirit of the sea who could transform into a giant turtle that breathed...

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Image: Emman Asuncion Foronda | CC BY-SA 4.0

Mount Pinatubo: Pinatubo Today

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit jopetsy from Metro Manila, Philippines, CC BY 2.0. The caldera and its lake have become a popular destination for hikers and adventurers, with the preferred route running through Barangay Santa Juliana in Capas, Tarlac. The volcano remains active and monitored by PHIVOLCS; seismic activity increased in early 2021, and a weak phre...

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Image: jopetsy from Metro Manila, Philippines | CC BY 2.0