SAN MARCELINO, Zambales — The local government here reassured residents on Friday, April 19, that the deep rumbling sounds they have been hearing the past two days were not from Mt. Pinatubo.

This is Mount Pinatubo, an active stratovolcano located at the tri-point of Zambales, Tarlac and Pampanga. It had remained dormant for around 600 years until that tragic day on June 15 ...