Mayon volcano: eruption news and updates
Mayon volcano (Philippines): lava flows remain active, weak explosions
Thursday Feb 22, 2018 15:15 PM | BY: T
Mayon volcano this evening (22 Feb 2018) with the active lava flows (image: Tom Pfeiffer / VolcanoDiscovery)The volcano's activity continues with little changes but at relatively low levels: according to Phivolcs, there are 3 lava flows down the Miisi, Basud and Bonga-Buyuan gullies on the southern and southeastern flanks with their most advanced fronts having reached 3.3, 4.5 and 0.9 kilometers distance.
When observed in the evening, these flows were still modestly active, with abundant but smaller glowing rockfalls mainly in their upper portion.
During the afternoon and evening, we noticed only one smaller short-lived explosion. This seems not entirely compatible with the updates from Phivolcs the latest of which (from this morning) described up to 80 seismic signals likely related to episodes of "lava fountains", that occurred sporadically, ejecting incandescent blocks to 100-600 m above the vent, and producing ash plumes that rise a few hundred meters (up to approx. 800 m):
"in the past 24 hours was characterized by sporadic and lava fountaining, lava flow and degassing from the summit crater. Between 7:34 AM yesterday and 4:06 AM this morning (22 Feb), the seismic network recorded eighty (80) discrete seismic events associated with otherwise obscured lava fountaining that lasted two (2) to forty-nine (49) minutes and were accompanied by rumbling and chugging sounds audible beyond 10 kilometers of the summit crater."
"Incandescent lava fountains with heights of 100 to 600 meters generated dirty white to gray ash plumes that rose 100 to 800 meters from the summit before drifting west-southwest to southwest. Seven (7) episodes of lava-collapse pyroclastic density current (PDC) events were visually observed between 1:44 PM and 3:05 PM yesterday depositing along within two kilometers of the summit crater. Lava flow sustained at 3.3 kilometers, 4.5 kilometers and 900 meters on the Miisi, Bonga and Basud Gullies, respectively, from the summit crater. Pyroclastic density currents or PDCs remained confined within the farthest recorded reaches of 4.6, 5.2 and 4.2 kilometers on the Miisi, Bonga and Basud Gullies, respectively."
Phivolcs recorded 143 volcanic earthquakes, continued inflation and elevated SO2 values (4,273 tonnes/day on 21 February 2018), when have almost doubled over the course of the past days (but these numbers are prone to large measurement errors).
These data suggest that the volcanic edifice is still pressurized by plenty of magma likely to erupt and aliment the ongoing eruption, which therefore could still continue for a while.
Wednesday, Feb 21, 2018
Tuesday, Feb 20, 2018
Mayon volcano Volcanic Ash Advisory: ERUPTION VA CLD UNKNOWN REPORTED AT 20180220/1607Z OBS VA DTG: 20/1600Z
Tuesday, Feb 20, 2018
Mayon volcano Volcanic Ash Advisory: ERUPTION VA CLD UNKNOWN REPORTED AT 20180220/0407Z OBS VA DTG: 20/0400Z
Monday, Feb 19, 2018
Mayon volcano Volcanic Ash Advisory: ERUPTION VA CLD UNKNOWN REPORTED AT 20180219/1300Z OBS VA DTG: 19/1250Z