Philippine Standard Time
 

ts

At 12:43 PM yesterday, a dense, five-kilometer tall eruption column was generated by a short-lived phreatomagmatic eruption at Mayon Volcano that lasted eight (8) minutes based on the seismic record. The event generated pyroclastic density currents or PDCs on gullies and barrancos heading the Miisi, Bonga, Buyuan, Basud, San Andres, Buang, Anoling and other minor rivers within four (4) kilometers of the summit vent, well within the Permanent Danger Zone (PDZ). Volcanic ash was blown west and fell on the Municipalities of Guinobatan, Camalig, Oas, Polangui and Iriga City. This was followed by a minor degassing event at 5:51 PM that generated a short, 500 meter-high ash plume. Between 9:37 PM and 5:25 AM the following morning, five (5) episodes of intense but sporadic lava fountaining from the summit crater lasting three (3) to thirty (30) minutes occurred. The lava fountains reached 500 meters to 700 meters high and generated ash plumes that reached 2.5 kilometers to 3 kilometers above the crater. The events fed lava flows on the Miisi and Bonga Gullies, sprayed near-vent lava spatter and fed incandescent rockfall on the summit area.

A total of two (2) explosion-type earthquakes corresponding to the vertical column eruptions, fifteen (18) tremor events, some corresponding to lava fountaining episodes, thirty five (35) rockfall events and (2) pyroclastic density currents or PDCs from lava collapse were recorded by Mayon's seismic monitoring network. Rockfall events were generated by the collapsing lava front and margins of the advancing lava flow on the Miisi Gully and by shedding from the summit dome onto the Bonga Gully. Currently, the Miisi and Buyuan lava flows have advanced to three (3) kilometers and 200 meters, respectively, from the summit crater. Sulfur dioxide gas emission was measured at an average of 992 tonnes/day on 22 January 2018 prior to the phreatomagmatic event. Electronic tilt and continuous GPS measurements indicate a sustained swelling or inflation of the edifice since November and October 2017, consistent with pressurization by magmatic intrusion.

PHIVOLCS has raised the alert level to Alert Level 4 yesterday in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden streamflows along channels draining the edifice. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft. DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

LATEST NEWS

April 23, 2020

PRIMER UKOL SA SERYE NG MGA LINDOL NA NAGANAP SA MABINI, BATANGAS NGAYONG 22 ABRIL 2020

Kinikilala ng DOST-PHIVOLCS ang pangangailangang linawin ang mga impormasyong inilabas namin. Inaasahan namin na matugunan ang inyong mga pag-aalala ukol sa  mga inilabas na PHIVOLCS Earthquake Information ngayong 22 Abril 2020 na tumalakay sa mga lindol sa Mabini, Batangas.   Ano ang nangyayari sa Mabini, Batangas, Balayan Bay at mga…

855 hits

April 23, 2020

PRIMER ON THE 22 APRIL 2020 SERIES OF EARTHQUAKES IN MABINI, BATANGAS

DOST-PHIVOLCS recognizes the necessity of clarifying information being released by the Institute. We hope to address the concerns of the public arising from the PHIVOLCS Earthquake Information releases today, 22 April 2020 covering the Mabini, Batangas earthquakes.   What is happening in Mabini, Batangas, Balayan Bay and vicinity? A series…

775 hits

March 17, 2020

ANNOUNCEMENT: SUSPENSION OF HAZARDS ASSESSMENT SERVICES

DOST-PHIVOLCS suspends its Hazards Assessment Services from March 17, 2020 until further notice. This means that the Institute will neither be accepting requests nor will it be releasing Signed Hazard Assessment Reports and related services within the period.  The temporary suspension of services is in response to the government’s directive…

1111 hits

February 21, 2020

PHIVOLCS REDAS Team Received Gawad Kalasag Award

The PHIVOLCS Rapid Earthquake Damage Assessment System (REDAS) Team was awarded the Special Recognition for Group Category during the 21st Gawad Kalasag Awarding Ceremony held at the Philippine International Convention Center (PICC) on December 6, 2019.  The Kalasag award is a national search award for Excellence in Disaster Risk reduction…

1128 hits

February 06, 2020

PRESS RELEASE: MAYON VOLCANO MONITORING EQUIPMENT STOLEN

Two solar panels, 150 watts each, were stolen from the DOST-PHIVOLCS Mayon Resthouse (VMRH) station that hosts instruments for earthquake monitoring, Global Positioning System (GPS) and tiltmeter. This was discovered by Mayon Volcano Observatory personnel during their routine inspection and preventive maintenance service on 05 February 2020. With loss of…

1957 hits

January 24, 2020

Taal Volcano Hazard Maps and Summary of Prone Barangays

Taal Hazard Maps List of Barangays  1. Taal Volcano Base Surge Hazard Map Summary of Barangays Prone to Taal Base Surge 2. Taal Volcano Tsunami and Fissuring Hazards Map Summary of Barangays Prone to Taal Volcanic Tsunami 3. Taal Volcano Ballistic Projectiles Hazard Map  Summary of Barangays Prone to Taal Ballistic Projectile…

14874 hits

WHAT'S NEW

May 28, 2020

TAAL VOLCANO BULLETIN 28 May 2020 08:00 A.M.

In the past 24-hour period, the Taal Volcano Network recorded seven (7) volcanic earthquakes that are associated mainly with rock-fracturing processes beneath and around the edifice. Weak steaming or fumarolic activity was observed from fissure…
May 28, 2020

MAYON VOLCANO BULLETIN 28 May 2020 08:00 A.M.

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the 24-hour observation period. Moderate emission of white steam-laden plumes that crept downslope before drifting west, west-northwest, northwest, and north-northwest was observed. Faint…
May 28, 2020

KANLAON VOLCANO BULLETIN 28 May 2020 08:00 A.M.

Kanlaon Volcano's seismic monitoring network recorded four (4) volcanic earthquakes during the 24-hour observation period. Moderate emission of white steam-laden plumes that rose 200 meters before drifting northwest was observed. Ground deformation data from continuous…
May 27, 2020

MAYON VOLCANO BULLETIN: 27 May 2020 08:00 A.M.

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the 24-hour observation period. Moderate emission of white steam-laden plumes drifting west to southwest was observed. Faint crater glow from the summit could…
May 27, 2020

TAAL VOLCANO BULLETIN: 27 May 2020 08:00 A.M.

In the past 24-hour period, the Taal Volcano Network recorded seven (7) volcanic earthquakes that are associated mainly with rock-fracturing processes beneath and around the edifice. Weak steaming or fumarolic activity was observed from fissure…
May 27, 2020

KANLAON VOLCANO BULLETIN: 27 May 2020 08:00 A.M.

Kanlaon Volcano's seismic monitoring network recorded two (2) volcanic earthquakes during the 24-hour observation period. Wispy emission of steam-laden plumes was observed. Ground deformation data from continuous GPS measurements indicate a slight deflation of the…
May 26, 2020

MAYON VOLCANO BULLETIN: 26 May 2020 08:00 A.M.

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the 24-hour observation period. Moderate emission of white steam-laden plumes that crept downslope before drifting north-northeast to west-northwest was observed. Sulfur dioxide (SO2)…

FEATURED

 

foi