Taal recorded 221 volcanic earthquakes in the past 24 hours — Phivolcs

Aileen Cerrudo   •   June 15, 2021   •   443

MANILA, Philippines — The Philippine Institute of Volcanology and Seismology (Phivolcs) on Tuesday (June 15) recorded a total of 221 volcanic earthquakes in Taal Volcano in the past 24 hours.

According to their latest bulletin, Phivolcs recorded 29 low-frequency tremors out of the 221, while 192 volcanic tremors occurred with durations from one to 135 minutes.

There was also an upwelling of hot volcanic fluids which resulted in plumes reaching 1,500 meters tall, drifting southwest.

As of June 14, sulfur dioxide (SO2) emissions averaged 5,837 tonnes per day.

The agency previously warned residents near Taal Volcano, particularly in Agoncillo, Batangas, to wear face masks and to stay hydrated to prevent inhaling sulfur oxide.

Meanwhile, Phivolcs stated that due to the ground deformation parameters from electronic tilt, Taal Volcano Island has begun deflating in April 2021.

“The Taal region continues to undergo very slow extension since 2020. These parameters indicate overall that magmatic unrest continues to occur at shallow depths beneath the edifice,” the bulletin stated.

Alert Level 2 is still raised in the region where Phivolcs strongly recommends that entry must be strictly prohibited into Taal Volcano Island, Taal’s Permanent Danger Zone, or PDZ, especially the vicinities of the Main Crater and the Daang Kastila fissure, and occupancy and boating on Taal Lake. AAC

Phivolcs lowers alert status of Mayon Volcano to Alert Level 0

Aileen Cerrudo   •   July 30, 2021

MANILA, Philippines—Alert status in Mayon Volcano was lowered to Alert Level 0 from Alert Level 1, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).

In an advisory, Phivolcs reported a decline in the frequency of volcanic earthquakes for the last six months. There is also a decreasing rate of inflation of the Mayon edifice this year. Sulfur Dioxide (SO2) emission flux from Mayon crater based on continuous gas spectrometry has declined below the baseline level of 500 tonnes per day since July 14.

Due to this, no magmatic eruption is foreseen in the immediate future, according to Phivolcs. However, there is still a possibility that alert level can be raised to Level 1 if there is a renewed increase of volcanic activity.

The public is still reminded to avoid entry into the 6-km Permanent Danger Zone or PDZ due to perennial hazards of rockfalls, avalanches, ash puffs and sudden steam-driven or phreatic eruption at the summit area which may occur without warning. AAC


Phivolcs says no tsunami threat to PH after 8.2 magnitude earthquake in Alaska

Aileen Cerrudo   •   July 29, 2021


MANILA, Philippines—The Philippine Institute of Volcanology and Seismology (Phivolcs) reported that there is no tsunami threat to the Philippines after an 8.2 magnitude earthquake struck the Alaskan peninsula.

“No destructive tsunami threat exists based on available data. This is for information purposes only and there is no tsunami threat to the Philippines from this earthquake,”  Phivolcs said in an advisory.

The agency added that no action is required at this time.

According to the United States Geological Survey (USGS), an 8.2 magnitude earthquake has struck 60 miles south east of Chignik, Alaska on July 29. AAC

171 volcanic quakes recorded at Taal Volcano

UNTV News   •   July 13, 2021

Taal Volcano showed signs of continued unrest, recording 171 volcanic earthquakes in the past 24 hours.

The Philippine Institute of Volcanology and Seismology said alert level 3 remains in effect over the volcano.

The quakes included 13 low frequency volcanic earthquakes and 157 volcanic tremor events lasting from one to 97 minutes.

Phivolcs reported low-level background tremor which has been observed since July 7.

It added that Taal Volcano’s sulfur dioxide emission is still high, averaging 6,134 tonnes/day on Monday, while steam-rich plumes were being observed rising from the main crater to as high as 1,500 meters before drifting southwest.


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