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
which descended into the caldera
lake (Lake Öskjuvatn). The slide was released from
the southeastern caldera wall, triggering a tsunami
in the lake that washed up on the lakeshores all
around the lake, reaching up to 20–30 m elevation
above the water level. The wave travelled farthest
around 400 m (horizontally) into the flatland SE of
the crater Víti. Fortunately, the rockslide occurred
/media/vedurstofan/utgafa/skyrslur/2015/IMO_AnnualReport2014.pdf
an important part of the runoff from many areas. In total, approximately
20% of runoff in Iceland originates from groundwater (Hjartarson, 1994a).
In the above mentioned previous simulation of runoff map for Iceland for the period 1961–
1990, groundwater was omitted. Effects of groundwater flowing across watershed
boundaries were simulated by scaling the precipitation for each watershed. On watersheds
/media/ces/2010_017.pdf
the maximum discharge of jökulhlaup water at the glacier
terminus is estimated as 97 m3 s 1. This jökulhlaup was a fast-rising jökulhlaup as
other jökulhlaups in Skaftá and cannot be described by the traditional Nye-theory of
jökulhlaups. The total volume of flood water was estimated as 53 Gl. The average
propagation speed of the subglacial jökulhlaup flood front was found to be in the range
0.2–0.4 m s 1
/media/vedurstofan/utgafa/skyrslur/2009/VI_2009_006_tt.pdf
Number
Faxaflói1Breiðafjörður0West fjords0North West0North East0Eastern coastal area0East fjords0South East 0South0Central highlands0
Total:1
Last 24 hours
Region
Number
/avalanches/notifications/
methodology is widely utilized by many automatic earthquake detectors, but instead of having
window lengths on the order of minutes, like the ALERT module, they have window durations
on the order of seconds. A longer STA window duration will make the module less sensitive to
small signals (Trnkoczy, 1999). Additionally, the total duration of the STA and LTA windows
may not exceed 24 hours
/media/vedurstofan-utgafa-2021/VI_2021_008.pdf
into three categories:
those characterized by numerous lakes in the central part of the
country; small and medium sized coastal rivers; and large and
medium sized rivers of northern Finland (Fig. 1b) (Mustonen,
1986; Korhonen and Kuusisto, 2010). Thousands of lakes (4500
over 0.5 km2 and 188,000 lakes of at least 0.05 ha) that cover about
10% of the total area of Finland give the watersheds in central
/media/ces/Journal_of_Hydrology_Veijalainen_etal.pdf
flood (jökulhlaup) is not to be expected. Long-term conductivity measurements of Gígjukvísl suggest that meltwater is draining freely from Grímsvötn following a jökulhlaup from the lake last autumn.
Explosive activity was observed near the ice-wall just south of the crater/fissure where the main activity has been. Overall assessment: Very little changes since yesterday. Explosions continue, only
/earthquakes-and-volcanism/articles/nr/2180