), for the purpose of predicting earthquakes, has been described as the Holy Grail of
seismology, i.e. highly desirable goal but with elusive results. Preseismic signals of the order of 10–
20%, reported in the 1960ies and 1970ies, have not been convincingly reproduced. Lower level (0.5–
3.5%) coseismic and postseismic in situ changes have, however, repeatedly been reported. Due to lack
of seismicity
/media/norsem/norsem_ingi.pdf
increase
Landslides also occur at central volcanoes without any
volcanic trigger. An example of this is the rockslide in Askja in 2014 where
long term subsidence of a caldera wall, formed in volcanic activity in 1875,
caused the slope instability. The slide is considered to be one of the biggest rock
slides event in Iceland during historical times. More about this landslide in Icelandic can
/volcanoes/volcanic-hazards/landslides/
in the slope of the caldera wall. The peak in tremor is subsequently caused by the debris fall into the lake. The following flood wave in the lake migrated several times back and forth, causing continuing but decreasing tremor that was seen during the next twenty minutes after the rockslide.
There is no evidence for a strong steam explosion in the earthquake data. However it can not be ruled out
/earthquakes-and-volcanism/articles/nr/2921
The volume of storage in the subglacial flood path, reached a maxi-
mum of 35 Gl which corresponds to two-thirds of the total flood volume. The volume
of subglacial storage was an order of magnitude larger than could have been melted
with the initial heat of the lake water and heat formed by friction in the flow along the
flood path. The largest part of the space for subglacial storage
/media/vedurstofan/utgafa/skyrslur/2009/VI_2009_006_tt.pdf
opportunity. Ármann Höskuldsson, IES, sent an illustrated account of the situation:
The fissure
All the active part of the fissure, at noon 12 September 2014. Photo: Ármann Höskuldsson.
The lava is still advancing in the riverbed of Jökulsá á Fjöllum. A narrow flow with heavy current is between the lava and the eastern wall of the riverbed. Occasionally, small steam explosives occur
/about-imo/news/nr/2985
opportunity. Ármann Höskuldsson, IES, sent an illustrated account of the situation:
The fissure
All the active part of the fissure, at noon 12 September 2014. Photo: Ármann Höskuldsson.
The lava is still advancing in the riverbed of Jökulsá á Fjöllum. A narrow flow with heavy current is between the lava and the eastern wall of the riverbed. Occasionally, small steam explosives occur
/about-imo/news/nr/2985/
A GPS station was mounted there on 10th July 2015 in order to monitor displacements at Bárðarbunga in the aftermath of the Holuhraun eruption. Further adjustments and maintainance took place in November 2015 (see photos).
News
2023
2022
2021
2020
/about-imo/news/bigimg/3345
of ten days. An unusual presentation in the sense that the surface location is shown on a topographic map at the bottom, instead of at the top, in order to improve visibility and clarify the connection between location and depth.
The gray planes represent depths at 0 km, 5 km and 10 km from the true surface. The colour code of the earthquakes indicates days as counting from 16th August which
/earthquakes-and-volcanism/articles/nr/2948
Exploring reasons why the risks of natural hazards seem to be ignored
by H. Asbjørn Aaheim, CICERO
Researchers give different explanations to why the risks of natural hazards seem to be ignored by
individuals, and management strategies are often deemed inappropriate. This presentation combines
empirical evidence from various disciplines and theoretical insights in order to identify critical
/media/loftslag/Asbjorn_Aaheim_(CICERO,_Norway).pdf