 Nyora kupfuurira kweiyi ndima - Iyo Philippine Fault System, kusanganisira Digdig Fault, iyo yakaongororwa seyakakonzera kukanganisa kwekudengenyeka kwenyika kwaJuly 16, 1990 Luzon, uye San Manuel Fault, Bulangit Fault uye San Roque Fault mamwe emitsetse mikuru yekukanganisa kuyambuka rwizi. 