Several new ash eruptive stages at the volcano commenced at 18:00 local time yesterday.
Intermittent periods, lasting from 1 to 43 minutes, consisted of 16 events accompanied by low-frequency (long-period) earthquakes with a duration ranging between 30 seconds and 1 minute.
The PHIVOLCS and Volcanic Ash Advisory Center (VAAC) Tokyo detected ash plume sequences that rose to an estimated 9,000 ft (2,700 m) altitude and dissipated to the northeast.
Alongside the heightened activity, a new lava effusion began from the summit crater following an increased flux of magma in the main conduit. The new lava flow has been feeding existing lava flow arms on the southern Mi-isi, southeastern Bonga and eastern Basud ravine, currently 2.8 km, 3.4 km and 600 m long.
About 100 glowing avalanches tumbled down the slopes as they detached from the viscous lava flow fronts.
The seismic station registered 258 earthquakes and one volcano-tectonic tremor (1 min 30 sec).
Sulfur dioxide (SO2) emissions reached to a 2325 tonnes yesterday.
The short-term electronic tilt monitoring continues to detect the lower eastern slopes deflated since early July and the mid-northwest flank inflated over the past week. However, the long-term ground deformation in general suggests the ongoing uplifting of the edifice since 2020.
In order to mitigate the risk, people are forbidden to enter an area of 6 km distance from the summit crater due to impacts of rockfalls, pyroclastic falls and/or phreatic eruptions.
The alert level for the volcano remains at Level 3.
Source: Philippine Institute of Volcanology and Seismology volcano activity update 1 August 2023
The lava flow from the summir crater (source: PHIVOLCS)
LOOK! Lava effusion from Mayon Volcano’s summit crater continues for the 8th straight week, feeding rockfall and lava flows in the Mi-isi, Bonga, and Basud Gullies. Video taken between 05:51 PM and 06:21 PM this evening, 31 July 2023. #MayonVolcano pic.twitter.com/bYs11pIRYt
— PHIVOLCS-DOST (@phivolcs_dost) July 31, 2023