MANILA, Philippines — A magnitude 5.5 earthquake jolted parts of Occidental Mindoro on Saturday (May 4), the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
In its earthquake bulletin, Phivolcs said the tremor struck at 9:05 a.m. 23 kilometers west of Rizal town.
The quake was tectonic in origin and had a depth of eight kilometers.
According to Phivolcs, varying intensities were felt in the following areas:
Intensity V – Rizal & San Jose, Occidental Mindoro; Calapan, Oriental Mindoro Intensity III – Lipa City, Batangas; Malay, Nabas & Ibajay, Aklan; Libertad, Antique; Puerto Galera, Oriental Mindoro Intensity II – San Nicolas, Batangas; City of Manila
Instrumental Intensities: Intensity IV – San Jose, Occidental Mindoro Intensity III – Calapan City, Oriental Mindoro Intensity II – Tagaytay City; Malinao, Aklan; Sebaste & Culasi,Antique; Calatagan, Batangas Intensity I – Talisay, Batangas; Dolores & Mauban, Quezon; San Jose, Antique
Phivolcs said no damage and aftershocks are expected following the temblor.
Evacuees in the 12 towns of Batangas have started to return to their homes after the Philippine Institute of Volcanology and Seismology (Phivolcs) lowered the alert level of the Taal Volcano from 4 to 3.
Several evacuees in Batangas City, however, opted to stay behind for fear of a major explosion of Taal.
Lilibeth Arajo, a resident from the town of Taal who is now in an evacuation in Batangas City, said they are still awaiting the final decision of the authorities to really be sure that it is indeed safe to go home.
She added that their house is on the outskirts of Taal and transportation is not easily accessible.
Another evacuee said it is not yet certain that there will be immediate livelihood or source of income for them should they go home now. — (with details from Vincent Arboleda) /mbmf
MANILA, Philippines — Taal Volcano spewed anew a tall column of thick, white steam early Friday morning (January 24).
Experts from the Philippine Institute of Volcanology and Seismology (PHIVOLCS) explained that the white steam-laden plumes of about 500 meters high that drifted towards the southwest direction signify that the heating up of volcanic materials underneath the crater has intensified.
In a press briefing, Volcano Monitoring Chief Ma. Antonia Bornas explained that the thick steam means that excessively hot volcanic materials are rising, causing the water to boil.
“Mayroon po kasi tayo talagang magma na umaakyat at ito po talaga ang binabantayan natin (The magma is still moving up and this is what we are monitoring at present),” Bornas said.
“Iyong steam ito po ay mula sa ground water or sa tubig ng lawa na sumisipsip sa ilalim ng lupa nung nagkaroon tayo ng fissuring at ito po ay nalilikha sa ibabaw ng magma dahil napakainit po nito at ibinubuga iyong steam (The thick steam came from ground water or the lake water that is drying up in the event of fissuring. There is evaporation going on top of the very hot magma thus steam is produced),” she added.
Bornas also noted the increase in sulfur dioxide (SO2) emission from 144 tons per day on Thursday (January 23) to an average of 224 tons per day on Friday.
Still, PHIVOLCS stressed that the high frequency of volcanic tremors indicates that the magma is continuously rising and may still result to an eruptive explosion.
Based on PHIVOLCS monitoring, Taal Volcano has generated 486 volcanic earthquakes including four low-frequency earthquakes.
The agency said Alert Level 4 still remains in effect over Taal Volcano which means a hazardous explosive eruption is possible within hours to days.
PHIVOLCS reiterates that forced evacuation of Taal Volcano island remains necessary as well as other identified high-risk areas where fissures are being observed.
MANILA, Philippines – Activities in the main crater of Taal Volcano may have been weaker but the signs of rising magma are still visible, according to the latest report from the Philippine Institute of Volcanology and Seismology (PHIVOLCS).
Based on PHIVOLCS’ 8:00 AM advisory (January 23), Taal volcano has generated weak to moderate emissions of white steam about 50 to 500 meters high from the main crater.
Emissions of sulfur dioxide (SO2) was measured at an average of 141 tonnes/day.
For the past 24 hours, PHIVOLCS recorded 467 volcanic earthquakes at the Taal Volcano network which means such intense activity likely signifies continuous magmatic intrusion beneath the Taal edifice.
PHIVOLCS emphasized that such may lead to further eruptive activity.
Alert Level 4 still remains in effect over Taal Volcano, according to the agency, as hazardous explosive eruption is still possible within hours to days.
Volcano experts strongly reiterate total evacuation of Taal Volcano Island and high-risk areas as identified in the hazard maps.
This covered areas within the 14-km radius from the Taal main crater and along the Pansipit River Valley where fissuring has been observed.
PHIVOLCS is continually monitoring the eruption and vows to provide updates of further developments in Taal volcano region.
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