Phivolcs lowers alert status in Mt. Bulusan to Alert Level 0

Aileen Cerrudo   •   August 18, 2021   •   366

The alert status of Mt. Bulusan has been lowered to Alert Level 0 or normal, the Philippine Institute of Volcanology and Seismology (Phivolcs) announced Wednesday (August 18).

Based on the August 18 bulletin, Bulusan Volcano has returned to normalcy following a general decline in monitoring parameters.

This is due to the decrease in the volcanic earthquake activity to the baseline level of 2-3 earthquakes per day between July 1 and August 17. A total of only 109 weak events were recorded during the said period.

Sulfur dioxide emission or SO2 flux from active vents on Bulusan remained below detection levels since May 6. When present, emission of steam plumes from the active vents on the upper Bulusan edifice has been very weak to weak, consistent with diminished hydrothermal activity.

However, in the event of a renewed increase in any one or combination of the above monitoring parameters, the alert status may step up once again to Alert Level 1.

Phivolcs also reminds the people living in valleys and active river channels near Mt. Bulusan to remain vigilant against sediment-laden streamflows and floods in the event of prolonged and heavy rainfall.

Entry into the 4-km Permanent Danger Zone or PDZ is also prohibited due to perennial hazards of rockfalls, avalanches, and sudden steam-driven or phreatic eruption from any of the active vents which may occur without warning.

Phivolcs is closely monitoring Bulusan’s activity and any new development will be immediately communicated to all concerned. AAC

Phivolcs reports weak explosion in Mt. Pinatubo

Maris Federez   •   December 1, 2021

MANILA, Philippines — A weak explosion was recorded at Mount Pinatubo on Tuesday afternoon, the Philippine Institute of Volcanology and Seismology (Phivolcs) reported.

The Pinatubo Volcano Network recorded seismic and infrasound signals of a weak explosion at Mt. Pinatubo between 12:09 and 12:13PM, an advisory from Phivolcs said.

The agency confirmed that the event produced a plume that was detected by Japan’s Himawari-8 Satellite.

“The seismic and infrasound signals are not typical of known volcanic processes and are currently being evaluated together with other potential sources,” Phivolcs said.

The advisory further read that there has been very low seismic activity in the past days.

It added that the geochemical survey at Mt. Pinatubo Crater Lake yielded low diffused volcanic CO2, discounting magmatic activity beneath the edifice.

Phivolcs cautioned the public to refrain from going in the vicinity of Mount Pinatubo.

The agency also advised local government units (LGUs) to ban entry into the Pinatubo Crater until the source of the explosion is determined.

“Communities and LGUs surrounding Pinatubo are reminded to be always prepared for both earthquake and volcanic hazards and to review, prepare and strengthen their contingency, emergency, and other disaster preparedness plans,” Phivolcs said.

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

 

REACH US

The Philippine Broadcast Hub

UNTV, 915 Barangay Philam,

EDSA, Quezon City M.M. 1104

(+632) 8396-8688 (Tel)

info@untv-newsandrescue.com (General inquiries)

ABOUT UNTV

UNTV is a major TV broadcast network with 24-hour programming. An Ultra High Frequency station with strong brand content that appeal to everyone, UNTV is one of the most trusted and successful Philippine networks that guarantees wholesome and quality viewing experience.