383 volcanic earthquakes recorded in Taal Volcano in past 24 hours

Aileen Cerrudo   •   April 14, 2021   •   365

MANILA, Philippines— The Philippine Institute of Volcanology and Seismology (Phivolcs) on Wednesday maintained Alert level 2 over Taal Volcano as it recorded 383 volcanic earthquakes in the past 24 hours.

Based on the latest bulletin, upwelling of hot volcanic fluids in the main crater lake occurred Tuesday morning (April 13) and 383 volcanic earthquakes, including 238 episodes of volcanic tremor lasting from one to 12 minutes occurred in the past 24 hours.

Phivolcs also said it continues to observe “a very slow and steady inflation and expansion of the Taal region that began after the January 2020 eruption.”

The agency reminds local government units around the area to be vigilant and continuously assess the situation. Civil aviation authorities must advise pilots to avoid flying close to the volcano.

“DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders,” the bulletin said. AAC

Magnitude 5.8 earthquake rocks Occidental Mindoro

Marje Pelayo   •   May 12, 2021

MANILA, Philippines — A magnitude 5.8 earthquake rocked Occidental Mindoro at around 9:00 a.m. on Wednesday (May 12).

According to the report from the Philippine Institute of Volcanology and Seismology (Phivolcs), the center of the quake was located at Abra de Ilog.

It was tectonic in origin and had a depth of 110 kilometers.

The agency recorded the following instrumental intensities as a result of the earthquake:

Intensity V – Calatagan, Batangas

Intensity IV – Puerto Galera, Oriental Mindoro

Intensity III – Carmona, Tagaytay City, Cavite; Muntinlupa, Metro Manila; San Jose, Occidental Mindoro; Calapan City, Oriental Mindoro

Intensity II – Calumpit, Marilao, Plaridel, Bulacan; Las Piñas, Malabon, Marikina, Pasig, Quezon City, Metro Manila; Dolores, Gumaca, Mulanay, Quezon Province;
Olongapo City, Zambales

Intensity I – San Jose City, Nueva Ecija; Guagua, Pampanga; Infanta, Lopez, Polillo, Quezon Province

Alert Level 1 raised over Bulusan Volcano in Sorsogon

Marje Pelayo   •   May 12, 2021

MANILA, Philippines — The Philippine Institute of Volcanology and Seismology (Phivolcs) has raised alert status from zero to 1 over Bulusan Volcano in Sorsogon after recording more than 100 volcanic earthquakes in the past four days.

Alert Level 1 means that the volcano is currently in an “abnormal condition.”

According to the agency, the volcano has been exhibiting increased unrest after a total of 124 volcanic tremors recorded since Saturday (May 8) as well as sustained inflation based on ground deformation measurements.

“These parameters indicate that volcanic processes are underway beneath the edifice that are likely caused by shallow hydrothermal activity,” the agency said in an advisory posted on its website.

Phivolcs reminded local government units and the public that entry into the four-kilometer radius permanent danger zone must be strictly prohibited.

Also, vigilance in the two-kilometer extended danger zone on the southeast sector must be exercised due to the increased possibility of sudden and hazardous phreatic eruptions.

“People living within the valleys and along river/stream channels especially on the southeast, southwest and northwest sector of the edifice should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall,” the agency warned.

PHIVOLCS: 270 quakes recorded at Taal Volcano in past 24 hours

Robie de Guzman   •   March 26, 2021

MANILA, Philippines — A total of 270 quakes, including 193 episodes of volcanic tremor having durations of up to 12 minutes, were recorded in Taal Volcano in the past 24 hours, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said Friday.

In its latest bulletin, PHIVOLCS said it also monitored 77 low-frequency volcanic earthquakes, which is higher than the 25 recorded on the previous day.

The agency said it also observed weak emission of steam-laden plumes from fumarolic vents that rose up to 10 meters. Sulfur dioxide emission that averaged 925 tons per day was measured on Thursday.

“Ground deformation parameters from electronic tilt, continuous GPS and InSAR data analysis indicated a very slow and steady inflation and expansion of the Taal region since after the January 2020 eruption,” PHIVOLCS said.

“These parameters may indicate increased magmatic activity at shallow depths beneath the edifice,” it added.

Despite increased seismic activities, PHIVOLCS said that Taal Volcano remains under alert level 2 which means “increased unrest.”

The agency noted that the unrest has been “elevating” and that it is under constant evaluation.

PHIVOLCS reminds the public that under alert level 2, “sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within and around Taal Volcano Island.”

Entry into the island and its permanent danger zone, especially in the vicinities of the main crater and the Daang Kastila fissure, must be strictly prohibited, the agency stressed.

Civil aviation authorities are also advised to inform pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft.

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