PHIVOLCS assesses if Mindanao quake affected nearby volcanoes

Marje Pelayo   •   December 16, 2019   •   1104

MANILA, Philippines – More than a hundred aftershocks were felt across Mindanao since a magnitude 6.9 earthquake hit Davao del Sur on Sunday (December 15).

According to Science and Technology Undersecretary and PHIVOLCS Officer in Charge Renato Solidum, their is a high possibility that the movement of Tangbulan Fault caused the earthquake.

Tangbulan Fault can generate up to magnitude 7.2 earthquake.

It measures to 69.2 kilometers and is located between Makilala-Malungon Fault and Digos Faults.

Solidum reminded of further aftershocks but the possibility of an even stronger tremor from both faults is minimal.

“Dahil ang lugar na iyan sa southern Mindanao ay matagal ng hindi nagkakaroon ng lindol na malalakas, (That area in Southern Mindanao has not experienced strong earthquakes for a long time),” Solidum said.

“Ngayon nagkataon na nagsimulang magsikilos ito (But now it is starting to move),” he noted.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) is now observing if the recent tremblor has impacted nearby volcanoes such as Mt. Apo and Mt. Matutum.

In 1991, Mt. Pinatubo in Zambales erupted a year after a strong earthquake occurred in 1990.

“Parang bote ng softdrinks. Kung may bote ka ng softdrinks [at] walang laman yung softdrinks, kahit anong alog mo walang lalabas siyempre. Pero kung may laman yung softdrinks at inalog mo pwedeng lumabas,” Solidum explained.

(Similar to a bottle of soda. If you have an empty bottle of soda, no matter how much you shake it, nothing will come out. But if it contains soda and you shake it, the liquid would spill.)

“So the condition is, the volcano will respond if there is magma ready to be erupted,” he added.

PHIVOLCS advised owners of structures to have their establishments check before occupancy.

It is also important to learn from past experiences to be ready for future earthquakes that may happen in different areas in the Philippines especially in Metro Manila.

“Nakita ninyo naman ang ilang mga video shared sa social media. Hindi ayos ang pagreresponde ng mga tao na nagsisitakbuhan (We saw from the videos shared on social media, the responses were chaotic. People were running confused),” Solidum noted.

“Kailangang maprotektahan ang ating sarili at baka magka-stampede pa kung lahat ay talagang tatakbo lang (We need to protect ourselves but stampede might happen if all of us would just run around),” he concluded. – MNP (with details from Rey Pelayo)

Magnitude 5.1 quake rattles Occidental Mindoro

Robie de Guzman   •   December 21, 2021

A magnitude 5.1 quake jolted parts of Occidental Mindoro and nearby areas on Tuesday, the Philippine Institute of Seismology and Volcanology (PHIVOLCS) said.

In a bulletin, PHIVOLCS said the epicenter of the quake was located 15 kilometers northeast of Sablayan, Occidental Mindoro. It occurred at 12:08 p.m.

The temblor was a tectonic in origin and had a depth of 15 kilometers.

PHIVOLCS said the quake was felt at the following areas:

• Intensity IV – Sablayan and Rizal, Occidental Mindoro
• Intensity III – Abra De Ilog, Santa Cruz and Calintaan, Occidental Mindoro; Calapan City and Bansud, Oriental Mindoro
• Intensity II – Makati City; Batangas City; Baco, Oriental Mindoro
• Intensity I – Puerto Galera, Oriental Mindoro; Tingloy, Batangas;

“This is an aftershock of the October 03, 2021 M5.3 Sablayan, Occidental Mindoro Earthquake event,” the agency noted in its report.

Damage and aftershocks are to be expected following the quake, PHIVOLCS said.

Magnitude 5.5 quake hits Paluan, Occidental Mindoro — Phivolcs

Maris Federez   •   December 13, 2021

MANILA, Philippines — A magnitude 5.5 earthquake hit the town of Paluan in Occidental Mindoro at 5:12 in the afternoon on Monday (December 13).

The Philippine Institute of Volcanology and Seismology (Phivolcs) said the tremor was tectonic in origin with a depth of 104 kilometers.

Reported intensities were as follows:

Intensity IV- Calatagan, Batangas; Puerto Galera, Oriental Mindoro;

Intensity III – Batangas City, Lemery, Malvar and Bauan, Batangas; Tagaytay City and Amadeo, Cavite; Quezon City; City of Manila and Pasay City

Intensity II- Taguig City; Mandaluyong City; Makati City; Caloocan City; Malabon City; Tanay, Rizal; San Felipe, Zambales

Instrumental Intensities, on the other hand, reported the following:

Intensity IV – Calatagan, Batangas; Calapan City, Oriental Mindoro

Intensity III – Tagaytay City, Cavite; Plaridel, Bulacan; Batangas City; San Jose, Occidental Mindoro

Intensity II – San Ildefonso, Calumpit, and San Rafael, Bulacan; Carmona, Cavite; Muntinlupa City; Olongapo City; Malolos City, Bulacan; Dolores, Quezon; Talisay, Batangas

Intensity I – Pasig City; Quezon City; Las Piñas City; Malabon City; Marikina City; Guagua, Pampanga; Cabanatuan City, Nueva Ecija; Mulanay and Mauban, Quezon; Pandi and Marilao, Bulacan

Phivolcs said that there was no notable damage from the quake but aftershocks are likely to take place.

PHIVOLCS: Magnitude 5.3. quake jolts Batangas, others areas

Robie de Guzman   •   December 13, 2021

MANILA, Philippines — An earthquake with a magnitude of 5.3 hit parts of Batangas and other nearby areas, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said Monday.

In its earthquake bulletin, the PHIVOLCS said the quake was recorded approximately 24 kilometers southwest of Calatagan Batangas around 5:12 p.m.

The temblor had a depth of 99 kilometers and was tectonic in origin.

PHIVOLCS said Intensity 3 was felt in Quezon City while intensity 2 was felt in San Felipe in Zambales.

Instrumental Intensity 1 was felt in Quezon City, Tagaytay City, Batangas City, and Calatagan.

PHIVOLCS said no damage is expected from the quake but aftershocks are likely to occur.

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