In tandem with the volcanic tremor (believed to correlate with magma supply rates), visible lava activity has been significantly lower today as well. The increasing trend of activity at the volcano ended suddenly last night, when volcanic tremor abruptly fell to lower levels comparable to those before the surge of activity in the past two days. Volcanic tremor remains similar as yesterday, but inflation has again increased a bit and totals around 9 cm compared to pre-eruption levels at the station closest to the eruption, which suggests that new magma has been accumulating beneath the surface (and yet has to come out). It could be the result of a temporary increase in magma supply or actually also be caused by a decrease of the amount of lava going into the tube system, possibly caused by some obstacles or blockages, forcing some of it to erupt onto the surface at the vent is unknown. It is not known or easy to say what exactly causes such lava surges. As in the previous cases this happened during the past weeks, a new voluminous lava flow traveled downhill from the cone and invaded new areas, destroying more buildings in its path. It seems that sections of the northern crater wall in the cone collapsed, allowing contained lava to surge out in a short flood, or that generally, more lava is arriving at the rims and able to overflow them. The ash and steam plume reached more than 3,000 m height today. Like yesterday, there were continuous low lava fountains with dense ash emissions, producing a plume reaching over 3,000 m altitude, as well as a new significant lava overflow from the vents. The eruption has shifted most of the visible activity to the area close to the vents again.
#INVADERS SENTINELS OF TERRA FULL#
The full report is as follows: ERUPTION AT 20210919/1410Z ASH EMISSION ONGOING OBS VA DTG:19/2100Z to 10000 ft (3000 m) Volcanic Ash Advisory Center (VAAC) Toulouse warned about a volcanic ash plume that rose up to estimated 10000 ft (3000 m) altitude or flight level 100 and is moving at 15 kts in E direction. La Palma (Canary Islands (Spain)): Explosive activity continues. This is likely reflecting a renewed magma intrusion and migration under the surface, supported also by continued deformation of the surface.Ī swarm of small earthquakes occurred in late September, located in the south of Keilir area, that may be related to a new batch of magma rising inside the volcano's conduits, although no new ground deformation has been detected during this time period. However, GNSS and InSAR instruments observed a new inflation on the Reykjanes peninsula since the end of September.
Distribution of earthquakes in a north-south and east-west trending linear area under the volcano edifice (image: OVPF) Fagradalsfjall (Reykjanes Peninsula, Iceland): The effusive eruption at the volcano has already ended or has remained mostly calm since 18 September as lava flows have stopped.ĭuring the eruption, instruments continued to detect a deflation over the eruption site as magma used to leave from the deep chamber and pushed its way up to the surface.