Attendees offered a prayer to 43 victims who died in 1991, and to another person who died in the pyroclastic flows that occurred on June 23, 1993. A pyroclastic flow is a deadly, fast-moving mix ...

tephra and pyroclastic-flow deposits),” Phivolcs explained on its website. In a separate advisory, Phivolcs said Taal Volcano emitted 1,113.3 tons of sulfur dioxide on Monday, January 20.