MABALACAT CITY—Thirty-five years after Mt. Pinatubo’s 1991 eruption buried towns, darkened skies and displaced hundreds of thousands across Central Luzon, survivors remember not only the destruction—but the solidarity that helped them endure one of the world’s most powerful volcanic eruptions of the 20th century. As Pampanga marks the anniversary of the June 15, 1991 eruption,
