Mayon volcano: eruption news and updates
Mayon volcano (Philippines): increasing activity, sporadic small explosions, crater glow
Thursday Nov 15, 2018 16:20 PM |
Weak activity has returned to the volcano and signs are increasing that it might be heading towards another eruption in a not-too-distant future.
Glow from Mayon volcano's crater yesterday morning
After a period of calm since the end of the most recent significant eruption during early 2018 and a few isolated explosions in May and June, at least 3 small explosions occurred over the past days, including at least one that was described as weak "lava fountaining", i.e. involved fresh lava arriving in the summit area.
Monitoring data suggest that new magma has been intruding deep beneath the surface, without much seismic activity, but detected by ongoing inflation of the edifice since late June 2018.
Sulfur dioxide (SO2) emissions are high. In today's bulletin, PHIVOLCS reported: "an average of 1196 tonnes/day on 14 November 2018. Precise leveling data obtained on 22-31 October 2018 indicate inflation of the edifice in the southeast sector while the north sector indicate short-term deflation relative to 30 August to 3 September 2018. The volcano generally remains inflated relative to 2010 baselines. Electronic tilt data further show pronounced inflation of the mid-slopes beginning 25 June 2018, possibly due to aseismic magma intrusion deep beneath the edifice."
Two small, short-lived eruptions occurred on 8 Nov at 12:43 and on 12 Nov at 07:39 local time. Brownish ash plumes were observed rising a few hundred meters and drifting WSW and SW. Since then, weak glow can be seen in the crater area, probably caused not by fresh lava in the summit crater but hot gasses escaping the conduit.
According to PHIVOLCS, the explosions earlier this week were associated with a degassing events and there was no accompanying seismic or infrasound record.
On 11 Nov, a volcanic earthquake was associated with a short-lived lava fountaining event at 08:40. The event lasted for 36 seconds based on the seismic record and produced a brownish-gray ash plume that drifted SW. Crater incandescence was visible most nights during 7-13 November.
Alert Level 2 currently prevails over Mayon Volcano. This means that Mayon is at a moderate level of unrest. DOST-PHIVOLCS reminds the public that sudden explosions, lava collapses, pyroclastic density currents or PDCs and ashfall can still occur and threaten areas in the upper to middle slopes of Mayon. DOST-PHIVOLCS recommends that entry into the six kilometer-radius Permanent Danger Zone or PDZ and a precautionary seven kilometer-radius Extended Danger Zone or EDZ in the south-southwest to east-northeast sector, stretching from Anoling, Camalig to Sta. Misericordia, Sto. Domingo must be strictly prohibited. People residing close to these danger areas are also advised to observe precautions associated with rockfalls, PDCs and ashfall. Civil aviation authorities must advise pilots to avoid flying close to the volcano’s summit as airborne ash and ballistic fragments from sudden explosions and PDCs may pose hazards to aircrafts. (source: PHIVOLCS)
Monday, Nov 12, 2018
Sunday, Jul 01, 2018
Monday, Jun 18, 2018
Mayon volcano Volcanic Ash Advisory: POSS ERUPTION OBS AT 20180618/0410Z FL180 EXTD SW OBS VA DTG: 18/0430Z
Thursday, May 24, 2018