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Mayon volcano
Stratovolcano 2462 m / 8,077 ft
Luzon Island, Philippines, 13.26°N / 123.69°E
Current status: restless (2 out of 5)
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Mayon volcano eruptions:
1616, 1766, 1800, 1811(?), 1814, 1827, 1834, 1839, 1845, 1846, 1851, 1853, 1855, 1857, 1858, 1859, 1860, 1861, 1862, 1863(?), 1868, 1871-72, 1872, 1873, 1876, 1876, 1881-82, 1885, 1886-87, 1888, 1890, 1891-92, 1893, 1895, 1896, 1897, 1900, 1902(?), 1928, 1928, 1939, 1941, 1943, 1947, 1968, 1978, 1984, 1993, 1999-2000, 2001, 2002, 2003, 2003(?), 2004, 2006, 2009, 2013, 2018
Typical eruption style:
Explosive.
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Mayon volcano: eruption news and updates

Mayon volcano (Philippines): lava flows remain active, resumption of explosive activity

Monday Feb 26, 2018 08:14 AM | BY: T

Explosive activity at Mayon last night (so-called lava fountain) (image: Tom Pfeiffer / VolcanoDiscovery)
Explosive activity at Mayon last night (so-called lava fountain) (image: Tom Pfeiffer / VolcanoDiscovery)
Overall, no significant changes have occurred in the volcano's activity, but after a 2-day long lull, mild explosive activity resumed the day before yesterday (24 Feb), generating intermittent phases of ash emissions and ejections of incandescent tephra to up to a few hundred meters in single explosions.
These explosive phases have been occurring at irregular intervals of few minutes to several hours, but as of now (16:12 local time 26 Feb), it seems that they are becoming increasingly frequent.
Although in appearance these explosions resemble strombolian-type eruptions, their mechanism and the associated seismic tremor signal are more closely related to lava fountaining, where a sustained jet of gasses along with liquid and solid components of the magma column are being released in a sustained jet, as the very friendly and helpful staff of Phivolcs at the local observatory explained us yesterday.
Lava flow activity has been fairly stable, although the active fronts seem to be more or less stable at approx. 1 km distance, overlying the main body of the flows, whose most advanced fronts seem almost inactive, and only occasionally produce single glowing rockfalls.
Phivolcs mentions in its report from this morning:

"Mayon’s condition for the past 24 hours was characterized by weak lava fountaining, lava effusion and degassing from the summit crater. As of 7:04 AM this morning, a total of thirty six (36) discrete episodes of lava fountaining lasting two (2) to nineteen (19) minutes have occurred, accompanied by booming and rumbling sounds audible beyond 10 kilometers of the summit crater.
"Lava fountains 50-200 meters tall generated steam-laden plumes that rose to 150-600 meters from the summit before drifting southwest, west-northwest, northwest, and northeast. In the evening, lava effusion from the vent was observed to continue feeding lava flows that have maintained fronts at 3.3 kilometers, 4.5 kilometers and 900 meters on the Miisi, Bonga and Basud Gullies, respectively, from the summit crater.
"Only two (2) episodes of lava-collapse pyroclastic density currents (PDC) were visually observed between 10:33 AM and 10:38 AM yesterday on the Miisi, Basud and Bonga-Buyuan Gullies within 4 kilometers of the summit crater.

A total of one hundred twenty-four (124) volcanic earthquakes and one (1) rockfall event were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 2070 tonnes/day on 23 February 2018. Deflation of the lower slopes that began on 20 February was recorded by electronic tilt, consistent with the transition to quiet lava effusion at the summit crater, a brief lull and resumption of sporadic fountaining. Nonetheless, overall electronic tilt and continuous GPS data indicate that the edifice is still swollen or inflated relative to November and October 2017, consistent with campaign Precise Leveling data acquired this week."
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Links / Sources:
Previous news
Sunday, Feb 25, 2018
Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ... [more]
Satellite image of Mayon volcano on 25 Feb 2018
Sunday, Feb 25, 2018
Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ... [more]
Satellite image of Mayon volcano on 24 Feb 2018
Saturday, Feb 24, 2018
Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ... [more]
Saturday, Feb 24, 2018
Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ... [more]
Mayon volcano this evening (22 Feb 2018) with the active lava flows (image: Tom Pfeiffer / VolcanoDiscovery)
Thursday, Feb 22, 2018
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. ... [more]

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