occurred on two adjacent N-S faults in the∼
western South Iceland Seismic Zone. The first main shock was followed approximately 3 s later by the
rupture on a parallel fault, about 5 km to the west. An intense aftershock sequence was mostly confined
to the western fault and an E-W aligned zone, extending west of the main shock region into the
Reykjanes oblique rift. In this study
/media/norsem/norsem_martin.pdf
days, see additional information compiled during a sequence of events in 2004.
* Note: The Icelandic word jökulhlaup is widely used in the international geoscience literature for events of this kind; i.e. sudden outburst of floodwaters from subglacial or marginal lakes.
News
/about-imo/news/nr/2039
is generally considered to be the onset of this sequence of events. The size is not indicated, all the dots are equally big.
Same earthquakes are shown on the topographic map as in the 3D above, for easy grasping of facts. The height is exaggerated by factor 5 in order to bring forth the landscape. The dept is also multiplied by 5 in order to distinguish between the earthquakes.
Location, depth and age
/earthquakes-and-volcanism/articles/nr/2948
in the last months; a slight tendency of faster decrease might be seen during last weeks but more time is required to verify this observation. All in all, the moment release on the caldera rim has decayed by a factor of 10 - 20 since the end of August 2014. However, the current weekly moment release of about 1E17 Nm (Newtonmeter) is still remarkable for a volcanic earthquake sequence.
For the dyke
/earthquakes-and-volcanism/articles/nr/3083
earthquake locations
significantly.
Our first step is to test the algorithm on a small subset of 215 earthquakes in year 2001, as reported in
the SIL catalog, the earthquakes being located in and around the Geysir region in Southern Iceland.
Three small areas were active during the year of 2001, although only one of them was recorded to be
active as an earthquake sequence (western cluster; main
/media/norsem/norsem_begga.pdf
Woodward,
A.-S. Mériaux, F. S. Tweed & M. Lim ().
The role of multiple glacier outburst floods in
proglacial landscape evolution: The Ey-
jaallajökull eruption, Iceland. Geology (),
–; doi: ./G..
Esther Hlíðar Jensen, Jón Kr. Helgason, Sigur-
jón Einarsson, Guðrún Sverrisdóttir, Ármann
Höskuldsson & Björn Oddsson (). Lahar,
floods and debris flows
/media/vedurstofan/utgafa/arsskyrslur/VED_AnnualReport-2013_screen.pdf
time soon. It is known that magma accumulation can take
place for a long time, months, even years, without resulting in a volcanic eruption”
says Kristín Jónsdóttir, head of the Natural Hazard Monitoring Group at the
Icelandic Met Office. "What we are seeing now in Reykjanes can last a long
time and there can be a sequence of phases. The activity might reduce temporarily
and slow down without
/about-imo/news/continued-inflation-around-mt-thorbjorn
as history indicates.
The ongoing seismic swarm is interpreted as being a part of a sequence of
events that began on the Reykjanes peninsula at the end of 2019 and reaches
from Eldey skerry in the west to Krýsuvík in the east. This activity, which
consists of both seismic activity and magma intrusions, could be long and
periodic. The center of activity can shift between areas on the peninsula.
Along
/about-imo/news/m56-at-the-reykjanes-peninsula
side. A remarkable sequence of earthquakes accompanied the collapse.
Comparison with other major events
The course of events at Bárðarbunga and Holuhraun shows how lateral flow of magma for tens of kilometres can be sustained for months and controlled by a collapsing caldera. A comparison with the six other known caldera collapses of the last ~100 years, including the largest eruption of the 20th
/about-imo/news/on-the-bardarbunga-gradual-caldera-collapse
side. A remarkable sequence of earthquakes accompanied the collapse.
Comparison with other major events
The course of events at Bárðarbunga and Holuhraun shows how lateral flow of magma for tens of kilometres can be sustained for months and controlled by a collapsing caldera. A comparison with the six other known caldera collapses of the last ~100 years, including the largest eruption of the 20th
/about-imo/news/on-the-bardarbunga-gradual-caldera-collapse/