São Jorge volcano update: Uplift detected likely confirming magma intrusion at depth
Mon, 28 Mar 2022, 15:1415:14 PM | BY: T
Seismic trace of ROSA station on São Jorge island, showing small quakes and what could be an episode of tremor (image:
Preliminary satellite-based radar data confirm that a section of island's northern part, roughly corresponding to where the recent quakes have been occurring, has experienced uplift.
Depth of quakes over time under Sao Jorge volcano
This almost certainly confirms that magma intrusion at depth is the cause of the seismic swarm.
Copernicus #Sentinel1 interferogram (March 15 - March 27) during the seismic unrest in São Jorge Island in Azores #InSAR. Epicenters from IVAR - Instituto de Investigação em Vulcanologia e Avaliação de Riscos. pic.twitter.com/gWPuYAa0iq— Sotiris Valkaniotis (@SotisValkan) March 27, 2022
The earthquake swarm itself continues, but has been decreasing in intensity. In the past 24 hours, São Jorge volcano had 1 quake of magnitude 3.0 and 25 quakes between 2.0 and 3.0. On the other hand, the seismic plot has been showing an episode of what could be volcanic tremor a short time ago this afternoon; it could also be a local disturbance (some machines running near the seismic station etc); we cannot judge this without other data available. However, it if IS volcanic origin, it could be sign that magma has been moving inside some of the newly created conduits.
Mon, 28 Mar 2022, 01:52
The volcano-seismic crisis on the island continues. ... Read all
Sat, 26 Mar 2022, 08:15
An earthquake swarm started under the NW part of the island on 19 March 2022. More than 2000 mostly small quakes of magnitudes from 1.6-3.5 have been registered within the first few days of the activity. ... Read all