Niyanig ng magnitude 6.5 earthquake ang Cataingan, Masbate, nitong Martes ng umaga, 8:03 a.m. Naramdaman ito sa Northern Samar, Albay, at Aklan.
Kasabay ng malakas na pagyanig ng lindol sa Masbate ang paglabas ng bulletin ng Philippine Institute of Volcanology and Seismology (PHIVOLCS-DOST) dahil sa abnormal na kundisyon ng apat na aktibong bulkan—ang Taal sa Batangas, Mayon sa Albay, Kanlaon sa Negros Occidental, at Bulusan sa Sorsogon.
Ibig sabihin, nasa Alert Level 1 ang mga bulkang ito.
Mahigpit na paalaala ng PHIVOLCS, mag-ingat ang publiko at huwag pumasok sa 6-kilometer radius Permanent Danger Zone para makaiwas sa sakuna na dulot ng landslide, pagbagsak ng mga bato, abo, at phreatic eruptions mula sa mga nabanggit na bulkan.
Narito ang mga bulletin ng PHIVOLCS.
TAAL VOLCANO BULLETIN
"In the past 24-hour period, the Taal Volcano Network recorded five volcanic earthquakes.Weak streaming or fumarolic activity rising 20 meters high before drifting south-southwest was observed from vents on the Main Crater.
"Alert Level 1 (Abnormal) is maintained over Taal Volcano.
"DOST-PHIVOLCS reminds the public that at Alert Level 1, sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within the Taal Volcano Island."
MAYON VOLCANO BULLETIN
"Mayon Volcano’s monitoring network recorded one (1) rockfall event during the 24-hour observation period. Moderate emission of white steam-laden plumes that rose 750 meters before drifting northeast, southwest, and west-southwest was observed. Sulfur dioxide (SO2) emission was last measured at an average of 222 tonnes/day on 23 July 2020.
"Ground deformation data from Precise Leveling surveys on 12–19 June 2020 indicated slight inflation of the edifice relative to the February 2020 survey.
"Electronic tilt data also indicated non-steady inflation of the middle to upper edifice that began in late 2019. This follows an inflationary trend that has been recorded by continuous GPS monitoring since the middle of 2019.
"DOST-PHIVOLCS would like to remind the public that Mayon Volcano is at Alert Level 1, which means that it is at an abnormal condition.
"Although this means that presently no magmatic eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone."
KANLAON VOLCANO BULLETIN
"Kanlaon Volcano's monitoring network recorded four (4) volcanic earthquakes during the 24-hour observation period.
"Moderate emission of white steam-laden plumes that rose 500 meters before drifting northwest and northeast was observed. Sulfur dioxide (SO2) emission was measured at an average of 1012 tonnes/day on 02 August 2020.
"Ground deformation data from continuous GPS measurements indicate slight inflation of the lower and mid slopes since May 2020, while short-term electronic tilt monitoring on the southeastern flanks recorded inflation on the lower to mid slopes that began on June 21, 2020.
"These parameters may indicate hydrothermal or magmatic processes occurring beneath the edifice.
"DOST-PHIVOLCS would like to remind the public that Kanlaon Volcano is at Alert Level 1, which means that it is at an abnormal condition and has entered a period of unrest."
BULUSAN VOLCANO BULLETIN
"Bulusan Volcano’s monitoring network did not detect any volcanic earthquake during the 24-hour observation period.
"Weak emission of white steam-laden plumes from the lower southeast vent was observed. Ground deformation data from continuous GPS measurements indicate slight inflation on the edifice since July 2020, while the long-term trend since May 2019 denotes that the edifice is still deflated.
"These parameters indicate that volcanic processes are underway beneath the edifice that may be caused by deep-seated degassing or hydrothermal activity or magmatic intrusion.
"Alert Level 1 (Abnormal) status prevails over Bulusan Volcano, which means that it is currently in an abnormal condition.
"Local government units and the public are reminded that entry into the four-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited and that vigilance within the two-kilometer Extended Danger Zone (EDZ) on the southeastern sector must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions."
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