deformation and seismicity preceding
the eruption that began 19 March 2021.
a) Model of deformation 24 February – 19 March, showing horizontal
displacements as arrows and vertical displacements with a colour
scale. The red line shows the location of the dyke and the
broken black line shows the central axis of
the plate boundary
b) Hourly earthquake rate (blue) and cumulative number of earthquakes
/about-imo/news/fagradalsfjall-eruption-unusual-in-many-ways-compared-to-other-eruptions/
and deformation
may precede many eruptions this is not always the case and depends on how much
stress has already been released and the strength of the upper crust”, says Michelle.Figure 2. A) GPS data from the station KRI in Krísuvík. The
blue line indicates the beginning of the eartquake swarm (24.02) and the red
line shows the beginning of the eruption (19.03). A rapid deformation was
detected
/about-imo/news/the-small-eruption-in-fagradalsfjall-celebrates-six-months
and deformation
may precede many eruptions this is not always the case and depends on how much
stress has already been released and the strength of the upper crust”, says Michelle.Figure 2. A) GPS data from the station KRI in Krísuvík. The
blue line indicates the beginning of the eartquake swarm (24.02) and the red
line shows the beginning of the eruption (19.03). A rapid deformation was
detected
/about-imo/news/the-small-eruption-in-fagradalsfjall-celebrates-six-months/
for the largest ones. For these catchments, the index flood model is ex-
trapolated far beyond the range of characteristics for which it was developed and the estimation
of µi(D) may not be valid. This is in line with Crochet (2012a,b). This is the case in Region 1 for
catchment vhm200, for which the index flood is usually strongly understimated. This catchment
is by far the largest and much larger than
/media/vedurstofan/utgafa/skyrslur/2014/VI_2014_001.pdf
2008)
together with a regression line through this data set and a regression line derived for a data set
of more than a hundred valley glaciers (Bahr and others, 1997). The regression lines are of the
form
v = csg ; (5)
where v and s are glacier volume and area, respectively. The coefficient and exponent for the
Icelandic ice caps are c = 0:048, g = 1:23, when the area and volume are expressed
/media/ces/ces-glacier-scaling-memo2009-01.pdf
temperature trend, 1.2°C per century.
Figure 3. Winter (Dec to March) temperatures at Stykkishólmur. The red line corresponds to a linear trend of 1.2°C per century.
We also see that the individual warm and cold winter periods are similar to the corresponding annual ones in temporal behaviour. There are a few warm winters during the 19th century warm period with temperatures
/climatology/articles/nr/1213
temperature trend, 1.2°C per century.
Figure 3. Winter (Dec to March) temperatures at Stykkishólmur. The red line corresponds to a linear trend of 1.2°C per century.
We also see that the individual warm and cold winter periods are similar to the corresponding annual ones in temporal behaviour. There are a few warm winters during the 19th century warm period with temperatures
/climatology/articles/nr/1213/
cannot rule-out a sudden escalation in seismicity in connection with a hazardous flood.
On-line overview of seismicity levels within the caldera is available.
An overview of the Katla volcanic system is given in the Catalogue of Icelandic Volcanoes.
News
2023
2022
/about-imo/news/micro-earthquake-activity-at-myrdalsjokull
On Thursday the
26th of March an on-line Scientific Advisory Board meeting was held
to discuss the ongoing unrest in the Reykjanes peninsula. Scientists from IMO,
University of Iceland, ISOR and representatives from Civil Protection, HS-Orka,
ISAVIA-ANS, and the Environment Agency of Iceland attended the meeting.Magmatic intrusion still the most likely explanation for
the ongoing
/about-imo/news/more-research-is-needed-to-decipher-the-on-going-activity-at-the-reykjanes-peninsula-as-a-whole