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geographical location: tripoint boundary of the Philippine provinces of Zambales, Tarlac and Pampanga
volcano type: stratovolcano, active, composite cone
In mid-March 1991, villagers around Mt. Pinatubo began feeling earthquakes and after several explosions a Level 5 alert was issued indicating an eruption was in progress. On June 15th 1991, the second largest volcanic eruption of the twentieth century took place when Mt Pinatubo erupted at 1:42 pm local time. The eruption lasted for nine hours and caused several large earthquakes which resulted in the collapse of the summit and the creation of a caldera.
Pinatubo was a little known volcano and it had been dormant for 400 years. There were no known historic eruptions
Eruptions of Mount Pinatubo
Pinatubo has had at least 6 periods of activity with large explosive eruptions in its past 35,000 years prior to the 1991 eruption. The 1991 eruption in this context actually ranks as one of the smaller eruptions. An eruption, which occurred 35,000 years ago and probably created the caldera, was likely much bigger.
hazards posed:
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