In the Know: Areas within 14KM permanent danger zone and 20KM extended danger zone
Maris Federez • January 16, 2020 • 3678
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
MANILA, Philippines – The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported only about 29 volcanic earthquakes around Taal Volcano in the past 24 hours, an indication that rocks underground are breaking.
A column of white steam also continues to form but only up to 50 meters in height.
It has been a week since PHIVOLCS downgraded alert level over the Taal volcano to level 2 from the previous level 3.
According to PHIVOLCS OIC Usec. Renato Solidum, they need to observe Taal volcano’s activities for one more week before they can decide whether to further downgrade the alert status based on the agency’s standard operating procedure.
“Basta tuloy-tuloy ang kanyang mga parametro na bumababa ang bilang pwede natin masabi na pwede nating ibaba ito sa alert level number one (If the parameters continue to reduce in number, we might lower the alert level to number one),” Solidum said.
Entry restrictions remain within the permanent danger zone in Taal Volcano Island.
Solidum said the local government unit needs to assess first if the former residential areas would be conducive for living.
PHIVOLCS does not recommended constructing houses on the volcano island due to the risk of having the ground break apart should the volcano proceed to erupt. MNP (with details from Rey Pelayo)
MANILA, Philippines – A magnitude 5.4 earthquake rattled parts of Davao Occidental on Thursday afternoon, the Philippine Institute of Volcanology and Seismology (Phivolcs) reported.
In its bulletin, Phivolcs said the epicenter of the quake that struck around 5:54 p.m. was traced 35 kilometers southeast of Jose Abad Santos in Davao Occidental.
It had a depth of 190 kilometers and tectonic in origin.
The tremor was felt at intensity III in General Santos City, Tupi and Polomolok in South Cotabato, and Alabel, Saranggani; intensity II in Maasin and Malapatan, Sarangani, and Davao City, while intensity I was felt in Tampakan, South Cotabato.
Phivolcs said there was no reported damage but aftershocks should be expected.
MANILA, Philippines – The Philippine Institute of Volcanology and Seismology (Phivolcs) on Friday downgraded Taal Volcano’s status from alert level 3 to alert level 2 following indications of decreased unrest in the recent weeks.
In its bulletin, Phivolcs said it lowered the alert level status of Taal Volcano after three weeks due to less frequent volcanic activity, stabilizing ground deformation of the Taal Caldera and Taal Volcano Island edifices, and weak steam or gas emissions at the Main crater.
“DOST-PHIVOLCS is lowering the alert status of Taal Volcano from Alert Level 3 to Alert Level 2 to reflect the overall decreasing trend in the level of monitoring parameters,” it said.
Alert Level 2 means there is decreased unrest, but State volcanologists said this should not be interpreted that unrest has ceased or that the threat of an eruption has disappeared.
The agency also reminds the public that at alert level 2, sudden steam-driven or phreatic explosions, volcanic earthquakes, ashfall and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within the volcano island and its coast.
It also advised that entry to the Taal Volcano Island – a permanent danger zone – shall remain prohibited.
“Local government units are advised to additionally assess previously evacuated areas within the seven-kilometer radius for damages and road accessibilities and to strengthen preparedness, contingency and communication measures in case of renewed unrest,” Phivolcs said.
“People are also advised to observe precautions due to ground displacement across fissures, frequent ashfall, and minor earthquakes. Communities beside active river channels particularly where ash from the main eruption phase has been thickly deposited should increase vigilance when there is heavy and prolonged rainfall since the ash can be washed away and form lahars along the channels,” it added.
Civil aviation authorities are also advised to direct pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft.
Phivolcs said alert level 3 may be raised again should an uptrend or pronounced change in monitored parameters forewarn a potential eruption.
On January 12, Taal Volcano spewed kilometers-high ash plumes which prompted state volcanologists to raise its status to alert level 4. Thousands of residents within the 14-kilometer radius from the main crater were ordered to flee their homes due to a possible hazardous eruption.
Two weeks later, Phivolcs downgraded Taal’s status to alert level 3, which allowed displaced residents outside the seven-kilometer danger zone to return to their homes.
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