Four earthquakes, including one with a magnitude of 6.0, struck Luzon on Saturday afternoon, with a town in Batangas province feeling a jolt of Intensity 7.
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that the first quake, with a magnitude of 5.6 and depth of 27 kilometers, struck at 3:07 p.m. a kilometer southwest of Mabini, Batangas.
Two minutes later, at 3:09 p.m., a stronger magnitude-6.0 quake struck 12 km northwest of Mabini, with a depth of 24 km.
A third one was recorded 20 minutes later at 3:29 p.m. with a magnitude of 4.1, traced 2 kms. southwest of San Luis, Batangas. The fourth quake (magnitude 4.7) happened an hour later at 4:36 p.m., 15 kms. northwest of Mabini.
The four earthquakes were all tectonic in origin.
The United States Geological Survey (USGS) initially recorded three of the earthquakes at different magnitudes: 5.7, 5.9, and 5.0.
According to the USGS, the first quake had a depth of 40.4 kilometers and struck at 3:08 p.m. east-northeast of Barangay Bagalangit in Mabini. The second one was traced to be 42.7 km deep and one kilometer south-southwest of Barangay Talaga in Tanauan City, Batangas.
The epicenter of the third, still according to the USGS, was traced a kilometer west-northwest of Taysan, Batangas.
Phivolcs said the first two quakes were felt strongest at Intensity 7 in Mabini, Batangas.
Intensity 7 is described in the PHIVOLCS’ Earthquake Intensity Scale as “destructive.”
Most people are frightened and run outdoors. People find it difficult to stand in upper floors. Heavy objects and furniture overturn or topple. Big church bells may ring. Old or poorly-built structures suffer considerably damage. Some well-built structures are slightly damaged. Some cracks may appear on dikes, fish ponds, road surface, or concrete hollow block walls. Limited liquefaction, lateral spreading and landslides are observed. Trees are shaken strongly.
The two first quakes were also felt at:
- Intensity 6 in Calatagan, Nasugbu and Tingloy, Batangas
- Intensity 5 in Batangas City, Sto. Tomas and Lemery Batangas; and Tagaytay City
- Intensity 4 inDasmarinas, Cavite; Lucena City; and Pateros City
- Intensity 3 in Makati City; Pasay City; Quezon City; Muntinlupa City; Malabon City;
- Mandaluyong City; and Bacoor, Cavite
- Intensity 2 in Daet, Camarines Sur
Phivolcs did not say if the earthquakes were aftershocks of the magnitude-5.5 quake that struck Tingloy, Batangas last Tuesday night.
Radio dzBB reports said the earthquake was felt in several parts of Luzon, including Metro Manila, Batangas and Cavite provinces.
Batangas Gov. Hermilando Mandanas told radio dzBB in an interview that minor damages to structures have been reported following the two quakes. He said there were still no reports of injuries.
Radio dzBB also reported that several college level classes in Metro Manila were suspended and power outages hit a few areas in the capital region following the two earthquakes.
PHIVOLCS chief Renato Solidum said the four earthquakes will not trigger a tsunami.
Palace: Stay calm
Presidential spokesman Ernesto Abella appealed for calm amid the series of quakes.
“We ask our people to stay calm and yet remain vigilant and alert,” said Abella, advising the public against spreading information from unverified sources that may cause undue alarm.
Disaster officials are now assessing the situation and will be giving updates to the publicas more information becomes available, he added.
Source: ALG/MDM, GMA News