centimetres. The starting area also appears
to have been moving in 2017, 2016, and 2015 but at a slower rate.Sentinel-1
satellite interferogram from June 23th to July 5th 2018. The colour scale
shows changes over the time period, mostly caused by atmosphere variations
in this case. Grey areas denoted areas where the ground surface has
changed more than is possible to detect with this technique
/about-imo/news/displacements-in-fagraskogarfjall-for-some-time-before-the-landslide-fell
a year, or its variations with the season. The maps are available in small and large domain.
The numbers reported in brackets on the large domain map correspond to the number of times that some UST stations (marked with grey dots) measured a concentration higher than the threshold the map is referring to. The numbers refer to hourly averaged concentration of SO2.
At a specific location
/pollution-and-radiation/volcanic-gas/hazard-zoning/
code used should be included on every chart.
3) The optional colour indicating 9+-10 tenths of nilas or grey ice should only be used to
indicate level ice, mainly on leads; it should not be used for ice broken into brash or ice
cakes or for concentrations less than 9+ tenths.
4) Undefined ice is used when it is known that ice is in an area but its characteristics are not
known
/media/hafis/frodleikur/ice-chart_colour-code-standard.pdf
a year, or its variations with the season. The maps are available in small and large domain.
The numbers reported in brackets on the large domain map correspond to the number of times that some UST stations (marked with grey dots) measured a concentration higher than the threshold the map is referring to. The numbers refer to hourly averaged concentration of SO2.
At a specific location
/pollution-and-radiation/volcanic-gas/hazard-zoning
The
plume has also been observed on IMO's weather radar at 5.2-5.4 km
height between 13:05 and 14:00 GMT.
Heading: East-south-east to south-east from the eruption site. Plume track clearly
visible up to 300-400 km distance from the eruption site on a noaa
satellite image at 13:13 GMT.
Colour: Observation from web cameras and from pilots in ICG-flight: Dark
grey ash plume observed over the eruptive
/media/jar/Eyjaf_status_2010-05-04_IES_IMO.pdf
from the local police; and geologist’s
observations of Eyjafjallajokull, west of the eruption site (no overflight today)
Eruption plume:
Height (a.s.l.): Plume not detected above a cloud level of 4 km (~13,000 ft).
Heading: West-northwest from the eruption site.
Colour: White (steam) clouds were visible over the advancing lava front. Grey-
coloured (ash) clouds were seen occassionally over
/media/jar/Eyjafjallajokull_status_2010-04-28_IES_IMO.pdf
of the eruption site.
Heading: South and south-west from the eruption site, but probably remaining close
to Eyjafjallajökull due to light winds.
Colour: White (steam) clouds at higher elevation; dark grey (ash) clouds seen
intermittently at lower elevation (see above).
Tephra fallout: Dark, fine-grained ash-fall reported over a 10 km region south of
Eyjafjallajökull between Núpur and Skógar.
Lightning
/media/jar/Eyjafjallajokull_status_2010-04-30_IES_IMO.pdf
detections from the weather radar at Keflavík Airport.
Heading: South-east from the eruption site. Plume track detected up to 400 km from
the eruption site on AHRR and MODIS satellite imagery (12:11 GMT and
13:30 GMT).
Colour: Dark grey (ash) clouds observed up to 4 km a..s.l. (~13,000 ft). White
(steam) plumes rising from Gígjökull, north of the eruption site.
Tephra fallout: Dark, coarser-grained
/media/jar/Eyjafjallajokull_status_2010-05-01_IES_IMO.pdf