The Philippine Institute of Volcanology and Seismology (PHIVOLCS) is urging all Filipinos to participate in a nationwide earthquake drill scheduled on June 18, with its director emphasizing that the exercise is most effective when paired with structurally sound buildings and a genuine culture of preparedness at the community level. PHIVOLCS Director Teresito Bacolcol made the call in an interview on DZRH News…