ThePhilippineauthoritiesraisedthealertlevelfortheMayonvolcanofromlevelthreetolevelfouronMonday,meaningthata"hazardouseruptionisimminent."Underalertlevelfour,the
Ashallow,5.1-magnitudeearthquakerattledthesouthernPhilippinesonFriday,thePhilippineInstituteofVolcanologyandSeismology(Phivolcs)said.Thequakestruck4kmnortheasto