Búland
Glacial outburst flood in their backyard
2.10.2015
The jökulhlaup in Skaftá 2015 is probably the largest to have occurred from the Skaftá cauldrons. It was imminent from 29th September and was registered at the gauge by Sveinstindur in the early hours
/hydrology/articles/nr/3209
: Sigurlaug Gunnlaugsdóttir.
In order to be able to predict an eruption, or issue a
public warning on imminent eruption, it is important to monitor the Earth's
crust with a dense network, especially where volcanoes are located to near
inhabited areas.
Volcanic areas are usually characterized by seismicity, which can
be very different for example in intensity and magnitude between different
/volcanoes/volcanic-hazards/earthquakes/
magma pressure
– they are not assumed to be the precursor to an imminent eruption.
GPS deformation
Seismic and GPS measurements reveal an approximately 25 km long dyke being formed in the
crust under the Dyngjujökull glacier east of Bárðarbunga. The results of the GPS measurements
also indicate a decrease in pressure in the magma chamber below the Bárðarbunga caldera, which
might suggest migration
/media/jar/Bardarbunga_daily_status_report_21082014.pdf
evening at 23:50. This large event was at a similar location as the earthquakes of
magnitude larger than three that were seen yesterday. The large seismic events in the
Bárðarbunga caldera are interpreted as adjustments due to decreasing magma pressure within the
caldera since the beginning of the unrest – they are not assumed to be the precursor to an
imminent eruption. Four new seismic instruments
/media/jar/Bardarbunga_daily_status_report_22082014.pdf
nearby Kvíárjökull since last week. Most of the water has probably already been
released. An increase in the seismic activity has been recorded for the last
few months, but for the past days it has been low. This data indicates
increased activity of the volcano which has not erupted since 1727. Currently
there are no signs of an imminent eruption. The Icelandic Coast Guard will fly over
/about-imo/news/a-new-ice-cauldron-in-oraefajokull-volcano
of an imminent volcanic eruption.
There is considerable uncertainty about how the situation will evolve. The
Icelandic Meteorological Office continues to monitor the region
around-the-clock via seismic observations.The ‘uncertainty phase' declared by the Icelandic Civil
Protection Authority remains in force and IMO's aviation colour-code is
unchanged at ‘yellow' for Öræfajökull
/about-imo/news/monitoring-oraefajokull
is imminent;
this may take years or even decades to transpire, so only time will tell what
will happen next at Reykjanes peninsula. IMO will
continue to closely monitor the area around Fagradalsfjall. The figure shows a time series plot for the GNSS
station FAFC close to Fagradalsfjall (see location on the InSAR figure above). From the middle of April until middle of August the east
/about-imo/news/update-on-fagradalsfjall
in the vicinity of densely populated areas where avalanche risks are imminent.
Warnings are issued of avalanche hazards and decisions are made about evacuating houses in cooperation with the locals.
Chronicles of snow avalanches have been written for each of the monitored towns and a few rural areas.
Landslides are being registrated and researched in co-operation with the Icelandic Institute
/avalanches/imo/
of today, 05 October 2011, an intense swarm of earthquakes was registered in the Katla caldera; the largest of these earthquakes had a local magnitude of ~3.7. Most of the ongoing seismicity is sourced at shallow (< 5 km) depths.
There are presently no measurable signs that an eruption of Katla is imminent; however, given the heightened levels of seismicity, the situation might change abruptly
/about-imo/news/nr/2360