MANILA, Philippines – A magnitude 5.3 earthquake struck off Glan, Sarangani Saturday morning, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.  Phivolcs said that this is an aftershock of the magnitude 7.8 earthquake that hit off the coast of Maasim, also in Sarangani last June 8. In its updated bulletin, Phivolcs downgraded the magnitude