Pinatubo (Philippines): Recorded Eruptions and Historical Activity

Pinatubo is a stratovolcano located in the Philippines at a tectonic setting characterized by a subduction zone and continental crust exceeding 25 km in thickness. Standing at an elevation of 1,486.0 meters, the volcano has a confirmed record of 9 eruptions spanning from ancient history up to 2021 CE, as documented by the Smithsonian Global Volcanism Program.

Overview of Recorded Activity

The official record for Pinatubo includes 9 confirmed eruptions with Volcanic Explosivity Index (VEI) values reaching up to 6.0. Because prehistoric and early historical dates rely on evidence methods such as calibrated radiocarbon (14C) dating, some records carry natural dating uncertainties, such as a 150-year uncertainty range for its earliest recorded activity.

The confirmed eruptions span across several millennia, shifting from ancient events dated through isotopic analysis to modern observations recorded by researchers and observers.

Historical Eruption Timeline and Extents

The earliest recorded activity in the official collection dates back to 7460 BCE in the Tayawan caldera area, carrying a VEI of 6.0 and a start-year uncertainty of 150 years. Additional prehistoric VEI 6.0 events occurred around 3550 BCE. Moving closer to the modern era, isotopic methods indicate an eruption around 1450 CE with a VEI of 5.0 and a start-year uncertainty of 50 years.

In the 20th century CE, Pinatubo produced major activity, most notably starting on April 2, 1991 CE, and ending on September 2, 1991 CE, along the lower north flank and summit with a VEI of 6.0. The most recent recorded eruption in the collection occurred on November 30, 2021 CE, with a VEI of 1.0.