Ground deformation monitoring at precise leveling sa Mt. Bulusan, natapos na

admin   •   May 14, 2015   •   2271

Ang precise leveling at ground deformation monitoring ng mga geodetic engineer ng PHIVOLCS sa Mt. Bulusan na nagsimula noong May 6, 2015. (Allan Manansala / Photoville International)

SORSOGON, Philippines — Tinapos na ngayong araw ng Huwebes ng mga geodetic engineers ng Philippine Institute of Volcanology and Seismology (PHIVOLCS) ang ground deformation monitoring at precise leveling sa paligid ng Bulkang Bulusan na sinimulan noong nakaraang linggo.

Subalit ayon kay Crispolodio Diolata Jr., resident volcanologist ng PHIVOLCS sa Sorsogon, aabutin pa ng mga ilang araw bago mailabas ang resulta ng ginawang pagsusuri at pagsusukat sa bulkan.

Hindi pa rin tukoy ng ahensya kung gaano karami at kalaki ang ash deposits sa crater ng Mt. Bulusan dahil sa hindi makita sa isinagawang aerial survey dahil sa makapal na ulap.

Ayon pa kay Diolata nakadagdag pa dito ang manaka-nakang pag-ulan sa probinsiya nitong mga nakaraang araw.

Nagpa-alala rin si PHIVOLCS Region 5 Supervisor na si Ed Laguerta sa mga residente sa Brgy. Cogon sa Irosin ng panganib kung patuloy na mag-aalburuto ang Mt. Bulusan at kung mauuwi sa magmatic eruption ang pagsabog nito.

Aniya ang geographical location ng Barangay Cogon ay nasa Valley ng bulkan ibig sabihin ito ang posibleng daanan ng lahar flow mula sa bulkan dala na aanurin ng malalakas na pag-ulan.

Kung mauuwi naman sa magmatic eruption ang Mt. Bulusan dito rin inaasahan na dadaan ang lava na ibubuga ng bulkan.

Ani Laguerta, “Yung Cogon proximity sa volcano and the geographical location, pag sinabing geographical location ang Cogon ay nasa valley, may channel siya sa volcano na diretso sa barangay.”

Samantala, nilinaw naman ni Laguerta na ang nangyaring magkakasunod na lindol na naramdaman sa probinsya ng Sorsogon ay walang kaugnayan sa pag-aalburuto ng Mt. Bulusan. (ALLAN MANANSALA / UNTV News)

House urged to probe govt’s alleged delayed warning on Taal eruption

Aileen Cerrudo   •   January 16, 2020

A lawmaker has urged the House of Representatives to investigate the government’s alleged delayed warning on the Taal eruption.

Cavite 4th District Rep. Elpidio Barzaga Jr. said there were “no news bulletins or SMS alerts” from the Philippine Institute of Volcanology and Seismology (Phivolcs) and other government agencies about the heightened activity in Taal Volcano.

“Due to lack of information, in the afternoon of the same day, while Taal Volcano is already manifesting increased volcanic activity, people still traveled towards it, while those who were already near Taal Volcano were shocked to see the smoke spewing from it and had to immediately flee under the dangers of ashfall,” he said.

Barzaga filed House Resolution (HR) No. 643 on Monday (January 13) and was released to the media on Tuesday (January 14).

However, Phivolcs reiterated there was no delay in the warning on the Taal eruption

During a press conference, Volcano Monitoring and Eruption Prediction Division chief, Mariton Bornas said, “Those on the island were already relaying to us their observations.”

“They were given advice in case they needed to evacuate,” she added.

Phivolcs Director Renato Solidum said “there are 6,000 people on the island. Nobody was injured, no one died.”

“It’s amazing. We should thank God nothing happened,” he said.

Malacañang said it is within the powers of Congress if they will approve the resolution or not.

Meanwhile, President Rodrigo Duterte previously said he is pleased with the performance of government agencies including the performance of Phivolcs Officer-in-Charge and Science and Technology Secretary Renato Solidum.

“I am really very pleased, very happy that all agencies are here on hand and trying their best to help the community,” he said.—AAC (with reports from Rosalie Coz)

In the Know: Areas within 14KM permanent danger zone and 20KM extended danger zone

Maris Federez   •   January 16, 2020

MANILA, Philippines — Authorities have been appealing to the public not to enter the areas considered to be within the 14-kilometer and 20-kilometer danger zones surrounding the Taal Volcano.

The Philippine Institute of Volcanology and Seismology (Phivolcs) noted that Taal Volcano has caused more than 500 tremors since its phreatic explosion last Sunday.

Phivolcs added that the fissures seen on the ground near the volcano; the drying up of the lake and the swelling of the volcanic crater, are signs of an imminent major explosive eruption.

The alert level 4 is still raised over Taal Volcano which prompted authorities to enforce the 14-kilometer permanent danger zone and the 20-kilometer extended danger zone.

Local governments within these zones must implement total evacuation.

Areas within the 14-kilometer-radius danger zone include the towns of Agoncillo, San Nicolas, Talisay, Balete, and Mataas na Kahoy; parts of Lemery, Laurel, Tagaytay City, Tanauan City, and Cuenca; and some barangays in the towns of Taal, Sta. Teresita, Alitagtag, San Jose, Lipa City, and Malvar.

To date, several towns in Batangas, such as Agoncillo, San Nicolas, Talisay, Taal, and Laurel are locked down.

Meanwhile, areas within the 20-kilometer-radius extended danger zone include Tagaytay City, Tanauan City, Malvar, Alitagtag, Sta. Teresita, Taal, Lemery, and Mendez; parts of Indang, Alfonso, Amadeo, and Silang in Cavite; as well as Calamba City in Laguna, Sto. Tomas, Malvar, Lipa City, San Jose, San Pascual, Bauan, San Luis, Calaca, Balayan, and Nasugbu in Batangas.

Based on the hazard map issued by Phivolcs, a base surge might happen following a major eruption.

Phivolcs said the intensity of the heat from the steam and ash brought about by the base surge will cause the temperature to rise to up to 1,000˚Celsius.

The areas that may be affected by the base surge include the towns of Talisay, San Nicolas, Laurel, Agoncillo, Lemery, Taal, Sta. Teresita, and Tanauan City; as well as some parts of Alitagtag, Cuenca, Mataas na Kahoy, Balete and Lipa City.

On the other hand, the ballistic projectile or areas that can be reached by rocks or boulders that Taal Volcano might spew in case of a major explosion include the towns of Talisay, San Nicolas, Agoncillo, and Lemery.

The explosion could also cause a tsunami in the lake which might affect the surrounding communities.

Authorities appealed to the public for cooperation and to refrain from going back to restricted areas until the volcanic activities have subsided. — (from the report of Bernard Dadis) /mbmf

Danger remains despite Taal volcano in ‘lull’ — PHIVOLCS

Marje Pelayo   •   January 16, 2020

MANILA, Philippines – Taal volcano is showing signs of hiatus but the Philippine Institute of Volcanology and Seismology (PHIVOLCS) says this can mean two things: its volcanic activity is waning or it is just “resting” before a major explosive eruption.

The agency appeals to residents to refrain from returning to risk areas until they have determined the true state of Taal Volcano.

PHIVOLCS Chief of Volcano Monitoring and Prediction Division (VMPD) Maria Antonia Bornas revealed in a press briefing on Thursday (January 16) that indeed, activities on the surface of Taal volcano have started to wane as compared to its activities on Sunday (January 12).

But the situation remains uncertain, thus the agency is still observing the volcano, particularly the swelling of the ground surface which is an indication of rising magma that could lead to a massive eruption.

Mas gusto nga sana natin na matapos na. Kung puputok man siya ng malakas, pumutok na sana para tapos na (We all want this to end. If it is going to erupt explosively, we hope it does soon so this could finally end),” Bornas said.

Kaso kung katulad po ng 1754 na may cycles, talaga na tatahimik. Magkakaroon ng low level activity tapos magkaka-lull, tapos biglang puputok ng malakas and then another cycle (However, it could be similar to what happened in 1754 where there were cycles of low-level activity, a lull, and then a sudden strong explosion, after which, another cycle begins),” he further explained.

PHIVOLCS asked residents to be more patient because until now, Taal Volcano is showing signs of danger thus Alert Level 4 remains in effect.

These can be seen from satellite images acquired by PHIVOLCS from the United States Geological Survey (USGS) that the volcano’s main crater lake has already dried up.

Also, the agency captured the volcano spewing a lava fountain on Monday (January 13).

PHIVOLCS asked the public to refrain from entering the 14-kilometer danger zone because the volcano may still erupt at any time and the risk of a base surge is high.

“Among scientists, we always say that evacuation is a political decision we can only advise,” the official said.

Masyadong mahirap na desisyon para sa mga local government official masyadong maraming factors silang kinoconsider hindi lang po science (The decision is more crucial for local government officials because they need to consider several factors other than science),” she added.

The agency advised the public to consult PHIVOLCS’ Hazard Hunter application online – hazardhunter.georisk.gov.ph.

The app can help identify risk areas and the potential hazards that may occur once Taal Volcano proceeds to its major explosive eruption. MNP (with reports from Rey Pelayo)

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