Phivolcs says magma in Taal Volcano could cause ‘explosive eruption’

Aileen Cerrudo   •   July 2, 2021   •   596

MANILA, Philippines — As Alert Level 3 is raised in Taal Volcano, the Philippine Institute of Volcanology and Seismology (Phivolcs) on Friday (July 2) said the magma in the volcano’s Main Crater could cause an ‘explosive eruption’.

In the latest bulletin, Phivolcs recorded a short-lived phreatomagmatic eruption at the Main Crater and generated a dark grayish plume that rose 1000 meters. There were also four more short phreatomagmatic bursts that lasted not longer than two minutes, with plumes rising to 200 meters.

“In the past 24-hour period, the Taal Volcano Network recorded twenty-nine (29) volcanic earthquakes, including one (1) explosion-type earthquake, twenty-two (22) low-frequency volcanic earthquakes, and two (2) volcanic tremor events having durations of three (3) minutes, and low-level background tremor that has persisted since April 8,” according to the bulletin.

High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as 3,000 meters high were also observed.

The volcanic gas emission drifted southwest and southeast from the Taal Main Crater and vog or volcanic smog was observed over Taal Volcano and vicinity.

Phivolcs advised communities around Taal Lake to remain vigilant, take precautionary measures against possible airborne ash and vog and calmly prepare for possible evacuation should unrest intensify.

Civil aviation authorities must advise pilots to avoid flying over Taal Volcano Island as airborne ash and ballistic fragments from sudden explosions may pose hazards to aircraft. -AAC

Phivolcs records sequence of earthquakes in Bicol region

Maris Federez   •   October 18, 2021

MANILA, Philippines — The Department of Science and Technology-Philippine Institute of Volcanology and Seismology (DOST-Phivolcs) has recorded a sequence of small earthquakes in the Bicol region following a small shallow-seated earthquake with a magnitude of 4.3 and depth of 4 kilometers occurred at 10:08 p.m. on October 14.

The location of the epicenter of the 4.3 magnitude quake was determined to be at 13.65 north latitude and 123.14 east longitude or at 3 kilometers North and 75 kilometers west of Canaman, Camarines Sur.

A total of 27 earthquakes were recorded by the nearest DOST-Phivolcs earthquake monitoring station located in San Jose, Camarines Sur (Station Code: SCSP).

Magnitude ranges from 1.7 to 4.3 with crustal shallow depths between 1 to 40 kilometers.

The last recorded event associated with this earthquake sequence was at 1:22 a.m. on Monday, October 18.

There was no similar event that followed as of 6:00 a.m.

Phivolcs also recorded ten events that were felt at various intensities in the provinces of Camarines Norte, Camarines Sur and Albay.

Calculation of the intensity distribution for the first event was performed using the Rapid Earthquake Damage Assessment System (Redas) software using the latest calculated parameters of the earthquake, according to the statement released by the DOST.

Results show that the magnitude and shallow depth of this inland event has the potential to cause damage in the general vicinity of the epicenter.

The department said it immediately informed the Office of Civil Defense (OCD) about this during the information release of the first event.

The DOST also noted that social media posts indicate that the event was widely felt with unconfirmed observations of non-structural damage (glass door was damaged) and damage to building content.

This prompted OCD to instruct their regional office to investigate the reported damage in the affected areas.

DOST-Phivolcs said that based on the collected data, this sequence of events, showing no identifiable large event, can be considered as an earthquake swarm that may occur in a tectonically active region, as suggested by sparse seismicity in this area of the Bicol region.

DOST-Phivolcs said it will closely monitor any progress of this earthquake activity and will continue to post updated information at the Phivolcs Official website.

Magnitude 5.2 earthquake hits Calatagan, Batangas

Aileen Cerrudo   •   October 8, 2021

A 5.2 magnitude earthquake hit Calatagan, Batangas at 2:14 a.m. on Friday (October 8), according to the Philippine Institute of Volcanology and Seismology (Phivolcs).

The quake has a depth of 131 kilometers and Intensity II was felt by residents in Calatagan.

Phivolcs said the earthquake was an aftershock of the magnitude 6.6 quake that occurred in the same area on July 24, 2021.

No damage was reported and no further aftershocks are expected. AAC

 

Taal Volcano records high-level of sulfur dioxide

Aileen Cerrudo   •   October 6, 2021

MANILA, Philippines—Taal Volcano has emitted a record-high level of sulfur dioxide (SO2) on Tuesday (October 5), according to the Philippine Institute of Volcanology and Seismology (Phivolcs).

Based on the latest bulletin of Phivolcs, the volcano spewed out 25,456 tons of SO2 dominated by upwelling of hot volcanic fluids in its lake. The volcanic activity also generated plumes 1,500 meters tall that drifted northwest and northeast.

Alert Level 2 remains over Taal Volcano. Phivolcs reminds the public that at Alert Level 2, sudden steam- or gas-driven explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within and around the Taal Volcano Island (TVI).

Phivolcs has recommended that entry into Taal Volcano Island, Taal’s Permanent Danger Zone or PDZ must be strictly prohibited, especially the vicinities of the Main Crater and the Daang Kastila fissure, and occupancy and boating on Taal Lake. AAC

 

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