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

Aileen Cerrudo   •   July 29, 2021   •   500

 

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

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.

4.3 magnitude earthquake hits Camarines Sur

Aileen Cerrudo   •   October 15, 2021

MANILA, Philippines—A 4.3 magnitude earthquake hit Camarines Sur on Thursday evening(October 14), according to the Philippine Institute of Volcanology and Seismology (Phivolcs).

Based on a bulletin, the center of the quake was located in Canaman, Camarines Sur. It was of tectonic origin with a depth of one kilometer. Due to the impact, several establishments within the area were damaged.

Phivolcs reported the following intensities:

Intensity V – Canaman, Camarines Sur
Intensity IV – Calabanga, Camaligan, Gainza, Ocampo, Pili, and Sipocot, Camarines Sur
Intensity III – City of Naga
Intensity II – Buhi, Camarines Sur

Phivolcs also reported the following instrumental intensities:

Intensity VI – Pili, Camarines Sur
Intensity V – Sipocot, Camarines Sur
Intensity III – Iriga City, Camarines Sur
Intensity II – Legazpi City, Albay
Intensity I – Mercedes, Camarines Norte

Authorities continue to conduct assessment, while responders are ready for deployment. AAC

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