Taal Volcano emits ‘anomalously’ high volcanic SO2 gas

Maris Federez   •   July 5, 2021   •   619

MANILA, Philippines — The Philippine Institute of Volcanology and Seismology (Phivolcs) on Sunday issued a public notice of what it calls an “anomalously high volcanic SO2 gas emission from Taal Volcano.”

Phivolcs said the highest levels of volcanic sulfur dioxide or SO2 gas emission were recorded Sunday at an average of 22,628 tonnes/day, the highest ever recorded in Taal.

A total of 26 strong and very shallow low-frequency volcanic earthquakes associated with magmatic degassing has been recorded beneath the eastern sector of Volcano Island on Sunday.

“These observation parameters may indicate that an eruption similar to the 1 July 2021 event may occur anytime soon,” the state volcanologists said.

The agency reiterated its reminder to the public that Alert Level 3 prevails over Taal Volcano and that current SO2 parameters indicate ongoing magmatic extrusion at the Main Crater that may further drive succeeding explosions.

Phivolcs also said that it strongly recommends Taal Volcano Island and high-risk barangays of Bilibinwang and Banyaga, Agoncillo and Boso-Boso, Gulod and eastern Bugaan East, Laurel, Batangas Province remain evacuated.

The agency said this is due to the possible hazards of pyroclastic density currents and volcanic tsunami should stronger eruptions subsequently occur.

The public is, likewise, reminded that the entire Taal Volcano Island is a Permanent Danger Zone (PDZ), and that entry into the island as well as high-risk barangays of the towns of Agoncillo and Laurel must be prohibited.

All activities on Taal Lake are also prohibited at this time, and that residents around the Taal Lake shores “are advised to remain vigilant, take precautionary measures against possible airborne ash and vog and calmly prepare for possible evacuation should unrest intensify.”

Phivolcs also advised local government units to conduct health checks on communities affected by vog to assess the severity of SO2 impacts on them and to evacuate severely exposed residents to safer areas due to the unprecedented high SO2 degassing from Taal Main Crater.

Taal Volcano Island is still a no-fly zone as airborne ash and ballistic fragments from sudden explosions and pyroclastic density currents such as base surges may pose hazards to aircraft, Phivolcs said.—/mbmf

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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