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SUMMARY:Using high-resolution daily ICEYE SAR interferometry to map magma 
 conduits formation in the shallow crust - Vincent Drouin\, Icelandic Meteo
 rological Office
DTSTART:20220223T160000Z
DTEND:20220223T170000Z
UID:TALK168422@talks.cam.ac.uk
CONTACT:Florian Millet
DESCRIPTION:Using ground deformation measurements of high spatial and temp
 oral resolution SAR\, the understanding of new vents created during volcan
 ic eruptions can be improved with 3D mapping of the activated shallow magm
 a plumbing system. Interferometric analysis of radar data from ICEYE X-ban
 d satellites with daily coherent ground track repeat (GTR) provides unprec
 edented time series of deformation in relation to the opening of 6 eruptiv
 e vents over 26 days in 2021\, at Fagradalsfjall\, Iceland. Unrest started
  in this location at the end of February and tens of thousands of earthqua
 kes were recorded during a four week duration. The seismicity was linked t
 o gradual formation of a magma-filled dike in the crust and triggered seis
 micity along the plate boundary. On 19 March\, an eruptive fissure opened 
 near the center of the dyke. New vents and eruptive fissures opened on the
  5th\, 7th\, 10th\, and 13th April. The daily acquisition rate of the ICEY
 E satellite facilitated the observation of the ground openings associated 
 with each new vents. Each event can be observed individually and with mini
 mal loss of signal caused by new lava emplacement\, which would occur if i
 mages were acquired at a slower rate. Being able to retrieve deformation n
 ear the edge of the fissure ensures that we have the optimal constraints n
 eeded for modelling the subsurface magma path. The ICEYE dataset consists 
 of Stripmap acquisitions (30x50km) in the period 3-21 March\, and Spotligh
 t acquisitions (5x5 km) from 22 March and onward. Images have a resolution
  of about 2 m x 3 m\, and 0.5 m x 0.25 m\, respectively. The descending 1-
 day interferogram covering each individual event is used to invert for the
  distributed opening along the dike plane. We find that the opening of the
  conduits in relation to each eruptive vent in April is mostly taking plac
 e in the topmost 100 meters of the crust and that opening is less than 0.5
  meters. There is almost no re-opening along previously formed magma pathw
 ays. There are also indications of new vent locations being influenced by 
 local conditions and stress in the shallow crust.
LOCATION:ONLINE - Details to be sent by email
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