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The most explosive eruption of Pinatubo is believed to have occurred around 35,000 years ago. That eruption is estimated to have been five times larger than the 1991 eruption, deposited pyroclastic flow material up to 100 metres (330 ft) thick on all sides of the mountain.

In recent history, the strongest eruptions occurred in June 1991 - starting on April 2, with phreatic eruptions along the summit. Additional eruptions continued over the next several several weeks. The most violent phase of the eruptions occurred on June 15 starting some time after 14:30 and lasting about 3 hours.

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