Activity of Mayon, Kadovar, Pacaya and Tungurahua.

Between 6:11 am and 2:31 am on January 26, the Mayon produced sporadic and intense fountaining, lasting between 26 and 57 minutes, which reached between 150 and 500 meters high and generated ash plumes from a height 500 m. to 3,000 m. above the crater.

These lava fountains fed the lava flows in the Miisi and Bonga drainages. Spatters and incandescent rocks watered the summit area.

Pyroclastic flows are also observed in the Miisi, Lidong / Basud and Buyuan drainages.

Sulfur dioxide emissions were measured at 1,916 tonnes / day on January 25, and inflation marks the magmatic intrusion.

Source: Phivolcs
 

To follow the activity of Kadovar, the only new satellite image is provided by Deimos2 dated 24.01.2018; The summit plume unfortunately masks that of the lava dome. A discoloration of the sea water can be seen along this portion of the coast.

Source: Deimos2 / Urthecast company

Despite the bad weather in Guatemala, the Insivumeh confirms that the lava flow produced by the Pacaya continues and reached this January 25 a length of 300 meters on the south-west flank.

The seismic network records tremor associated with degassing and rising magma.

Source Insivumeh

Significant changes were observed at the Tungurahua crater following a surveillance carried out on January 11, 2018 by the IGEPN teams.

An overflight of the crater by a drone resulted in a zenith photo and a high resolution digital surface model (~ 5 cm / px).
 

The study of these documents shows a net morphological change of the crater between 2008 and 2018:

- Two structures define an upper crater and lower crater; the upper crater is elliptical in shape and has a diameter of 100 x 94 m. in 2008 at 335 x 300 m. in 2018. The lower crater has a more irregular, elongated NNE-SSO shape of 77 m. long on 58 m. wide. At the bottom of the lower crater, two sub-circular coalescing depressions could correspond to the vent of the volcano.

- The bottom of the crater rose several meters: 47 meters in total.

- An elevation of the crater edge (+17 m at NW and +57 m at SSO) associated with an accumulation of eruptive material giving shape to an internal cone.

- Since 2011, the NO edge of the upper crater coincides with the edge of the outer crater.

This new configuration of the upper crater could favor the pouring of lava flows and pyroclastic flows along the northwest flank of Tungurahua, in case of new eruptive activity ... which is not relevant, the thermal monitoring crater and fumaroles confirm the decrease in internal Tungurahua activity over the past 22 months.

Source: IGEPN - monitoreo termico y cambios morphologicos del crater del volcano Tungurahua / 24,01,2018.