The Magnitude 5.4 earthquake that shook San Marcelino, Zambales on Thursday night will not trigger a movement of the West Valley Fault.
Pom Simborio, science research assistant of the Philippine Institute of Volcanology and Seismology (Phivolcs), explained that the quake's source was the Manila Trench.
"Ito po yung trench na nakaharap sa West Philippine Sea," Simborio said in an interview on DZMM Friday morning.
The West Valley Fault -- which runs through the cities of Marikina, Pasig and Muntinlupa -- is capable of generating a magnitude-7.2 quake that could kill up to 34,000 people and injure 100,000 others, a 2004 study said.
Thursday night's quake occurred at 10:27 p.m. with its epicenter at San Marcelino.
"Offshore po siya. 'Yung lalim niya po ay 83 kilometers," Simborio reported.
The following intensities were reported in these areas:
San Marcelino, San Felipe, Iba, Santa Cruz, Cabangan and Castillejos in Zambales; Dinalupihan and Abucay in Bataan; Quezon City; Pateros; Malolos, Obando in Bulacan; and Olongapo City.
Tagaytay City; Talisay, Batangas; San Jose del Monte, Bulacan; Pasay City; Makati City; Mandaluyong; Manila; Parañaque City; Taguig City; Caloocan City; Pasig City; valenzuela City; San Miguel, Tarlac; Marilao, Bulacan; Gapan City; Bongabon and Aliaga in Nueva Ejica.
Palayan City; Bacoor, Cavite; Calumpit, Bulacan; San Jacinto, Pangasinan; Cabanatuan City; and Lucban, Quezon.