The Philippine Institute of Volcanology and Seismology (Phivolcs) has so far recorded over 500 aftershocks following the magnitude 6.4 earthquake that struck Lagayan, Abra on Oct. 25.
As of 7 p.m., Wednesday, Oct. 26, Phivolcs had detected 528 aftershocks, with magnitudes ranging from 1.4 to 4.8.
Of the recorded earthquakes, 106 earthquakes have been plotted by three or more stations.
However, only six of the recorded tremors were felt, Phivolcs said.
The 6.4-magnitude earthquake, which struck Abra at 10:59 p.m. on Oct. 25, was also felt in neighboring provinces.
It was felt at Intensity VII (destructive) in Danglas, Tubo, and Licuan-Baay in Abra; City of Batac, Dingras, and Pinili in Ilocos Norte; and Sinait, Ilocos Sur.
The tremor was felt at Intensity VI (very strong) in La Paz, Lagayan, Bucay, San Juan, and Tineg in Abra; Balbalan, Kalinga; Bauko, Besao, Natonin, and Sabangan in Mountain Province; Banna, Carasi, City of Laoag, Nueva Era, Paoay, San Nicolas, and Sarrat in Ilocos Norte; and Aparri, Gonzaga, Iguig, Lasam, Peñablanca, Santa Ana, Santo Niño, and Solana in Cagayan.
Moreover, it was felt at Intensity V (strong) in Bangued, Boliney, Bucloc, Daguioman, Dolores, Lacub, Lagangilang, Langiden, Luba, Malibcong, Manabo, Peñarrubia, Pidigan, Pilar, Sallapadan, San Isidro, San Quintin, Tayum, and Villaviciosa in Abra; Conner and Kabugao in Apayao; Kapangan, Kibungan, La Trinidad, and Mankayan in Benguet; Banaue, Ifugao; Pinukpuk, Rizal, City of Tabuk, and Tinglayan in Kalinga; Barlig, Bontoc, Sadanga, Sagada, and Tadian in Mountain Province; Adams, Bacarra, Badoc, Bangui, Currimao, Dumalneg, Pagudpud, Pasuquin, and Vintar in Ilocos Norte; Alilem, Banayoyo, Bantay, Burgos, Cabugao, City of Candon, Caoayan, Cervantes, Galimuyod, Gregorio del Pilar, Lidlidda, Magsingal, Nagbukel, Narvacan, Quirino, Salcedo, San Emilio, San Esteban, San Ildefonso, San Juan, San Vicente, Santa, Santa Catalina, Santa Cruz, Santa Lucia, Santa Maria, Santiago, Santo Domingo, Sigay, Sugpon, Suyo, Tagudin, and City of Vigan in Ilocos Sur; Bacnotan, Balaoan, Bauang, Caba, City of San Fernando, San Juan, and Sudipen, La Union; and Abulug, Allacapan, Amulung, Baggao, Claveria, Lal-Lo, Tuao, and Tuguegarao City in Cagayan.
Intensity IV (moderately strong) was recorded in Calanasan, Flora, Luna, Pudtol, and Santa Marcela in Apayao; Bagui City, Atok, Bokod, Buguias, Itogon, Kabayan, Sablan, Tuba, and Tublay in Benguet; Asipulo, Hingyon, Hungduan, Kiangan, Lagawe, Lamut, and Tinoc in Ifugao; Tanudan, Kalinga; Paracelis, Mountain Province; Burgos, Piddig, and Solsona in Ilocos Norte; Aringay, Bangar, Burgos, Naguilian, Pugo, and Santol in La Union; Dagupan City, Malasiqui, City of Urdaneta, and Villasis in Pangasinan; and Buguey, Enrile, Sanchez-Mira, and Santa Praxedes in Cagayan).
Meanwhile, it was felt at Intensity III (weak) in Bakun, Benguet; Aguinaldo, Alfonso Lista, and Mayoyao in Ifugao; Laoac, Pangasinan; Alicia, Isabela; Baler, Aurora; and Pura and Ramos in Tarlac; and Intensity II (slightly felt) in Labrador, Pangasinan; San Manuel, Isabela; and Bamban, Camiling, and Paniqui in Tarlac.