The Nevado del Ruiz volcano continues to show instability in its behavior over the past week.
Seismicity related to fluid dynamics inside volcanic conduits showed an increase in both the number of earthquakes recorded and the seismic energy released, compared to the previous week.
Seismicity associated with rock fracturing also showed an increase in both the number of earthquakes recorded and the seismic energy released, compared to the previous week. This seismic activity was located mainly in the northeast sector, in the Arenas crater, and to a lesser extent in the southeast and southwest sectors. The depth of the earthquakes varied between 0.2 and 7.2 km. The maximum magnitude recorded during the week was 1.3 ML (Local Magnitude), corresponding to the earthquake of August 17 at 05:51 (local time), located in the Arenas crater at a depth of 2.0 km.
This week also recorded seismicity related to the processes of ascent, establishment, growth and evolution of a lava dome1 at the bottom of the Arenas crater.
Deformation of the volcanic surface continues to show minor changes.
The volcano continues to emit water vapor and gases, mainly sulfur dioxide.
The column of gas and steam reached a height of 3,200 meters measured at the top of the volcano on August 18.
The Nevado del Ruiz volcano continues at the yellow activity level.
This week, 19 lava avalanches were observed at Merapi on the southwest flank, dominant up to the Bebeng River with a maximum slip distance of 1,800m.
No significant morphological changes were observed at the domes, apart from changes due to avalanches. Mount Merapi's deformation that was monitored using EDM and GPS this week showed no significant changes. Based on photo analysis, the volume of the southwest dome is calculated to remain at 1,664,000 m³, and for the central dome, it is 2,772,000 m³.
Earthquake intensity this week has increased, particularly the VTA earthquake which indicated magmatic activity at a depth of >1.5 km from the summit.
The activity level remains at 3 / siaga, with the usual restriction zones
The weekly report of the OVSM-IPGP for the period between August 19 and August 26, 2022 mentions at least nine volcano-tectonic earthquakes under Mount Pelée (it had been three weeks since there had been any more earthquakes). They were of magnitude less than 0.1 and were located inside the volcanic edifice (500 to 900m deep). These earthquakes are, still according to the OVSM, associated with the formation of micro-fractures in the volcanic edifice. None of the earthquakes were felt by the population.
An extension of two areas of deteriorated vegetation located between Morne Plumé and the Chaude River was noted during helicopter overflights carried out on February 9 and May 5 with the support of Dragon 972 (see monthly bulletin for February 2022), and confirmed by analysis of satellite images and a drone (overflight of May 11).
The alert level remains yellow: vigilance.
Source: OVSM - IPGP
Krysuvik - Sentinel-1A InSAR descending interferogram from 30.07 to 23.08.2022 - each fringe = 3 cm - via Mounts Project
In the Reykjanes Peninsula, ground uplift at the lava field remains high. A new InSAR interferogram of Sentinel-1A (July 30 to August 23 - descending) has been published confirming this.
Magma remains present, but it seems that the pressure of the gases is not sufficient to make it migrate towards the surface. The cone in Meradalur does not present any more emissions for the moment, according to the webcams.
The break is getting longer... how long will it last?
Source: Sentinel via Mounts Project
Eruption in Meradalur on 08.27.2022 / 07:00 - Visir live webcam