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Fernandina volcano (Galápagos Islands): significant ground deformation and possible activity, first since Jan 2020

Sun, 14 Nov 2021, 06:01
06:01 AM | BY: MARTIN
Ground deformation data during Feb 20-Oct 21, yellow-to-red color indicates inflation in the NE area while blue color shows deflation in the W-SW slopes (image: IGEPN)
Ground deformation data during Feb 20-Oct 21, yellow-to-red color indicates inflation in the NE area while blue color shows deflation in the W-SW slopes (image: IGEPN)
During the period between Feb 2020 and October 2021, the local volcano observatory Instituto Geofísico recorded a significant ground deformation within the volcano's caldera.
InSAR (Interferometric Synthetic Aperture Radar) measurements in a collaboration with Sentinel-1 satellite images from European Space Agency (ESA) confirmed that the ground has been uplifted by approx. 400 mm/year beneath the NE flank of the volcano (attached image).
A negative deformation (so-called deflation) has been detected beneath W-SW slope of the edifice in the range of 100 mm-400 mm/year (attached image). No thermal anomalies, nor gas and ash emissions have been detected.
This is likely reflecting continued magma intrusion and migration under the surface, supported also by continued deformation of the surface, another tell-tale sign of an impending eruption. Based on deformation data, it is suggested that magma may be accumulated at 2 km shallow level or at deep magma reservoir located 4.5 km under the surface.
The last eruption at the volcano occurred in January 2020 dominated mainly by lava flows erupted from the eastern fissure vent.
Source: Instituto Geofísico volcano activity update 13 November 2021

Previous news

Wed, 10 Nov 2021, 06:00

Fernandina volcano (Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 10 November-16 November 2021 (Continuing Activity)

IG reported that slow deformation at Fernandina has been recorded over the previous 18 months. InSAR data showed that inflation was occurring at a rate of about 400 mm/year in the summit caldera and on the NE flank, while deflation was occurring at a rate of about 100-400 mm/year in areas on the upper W and SW flanks. On 13 October the areas of deflation changed to inflation and the rate of deformation in the caldera increased. ... Read all
Thu, 30 Jan 2020, 08:11

Fernandina volcano (Galápagos Islands, Ecuador): weekly volcanic activity report 22-28 Jan 2020

Lava flows as seen from the Bolivar Channel (image: Galapagos National Park)
IGEPN recorded on 23 January increased seismic activity. This is due to nine hour long eruption (12 January) associated with earthquakes with magnitude > M.3 and small swarms. ... Read all
Show more
Fernandina volcano
Shield volcano 1476 m / 4,842 ft
Galápagos Islands, Ecuador, -0.37°S / -91.55°W
Current status: restless (2 out of 5) Fernandina volcano eruptions:
2020, 2018, 2017, 2009
Typical eruption style
Effusive, basaltic fissure eruptions
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