Goodmorning to you all. Here the official report from 2 may!
Eruption in Eyjafjallajökull - Status Report: 21:00 GMT, 02 May 2010
Icelandic Meteorological Office and Institute of Earth Sciences, University of Iceland
Compiled by: MJR / MTG / FS / BO / SSJ / SH
Based on: IMO seismic monitoring; IES-IMO GPS monitoring; IMO hydrological data; web cameras of the eruption site from Vodafone, Mila, and Múlakot;
IMO weather radar measurements; information from scientists at Gígjökull. [No scientific overflight today.]
Height (a.s.l.): Estimated from web-camera views and observers on the ground at an elevation of 4–5.4 km (13–18,000 ft). Clouds of ash at lower
elevations observed drifting south-east of the eruption site. No verifiable detections from the weather radar at Keflavík Airport.
Heading: South-east from the eruption site. Plume track visible at least 200 km from the eruption site on MODIS (12:35 GMT) and EUMETSAT (17:15 GMT)
Colour: Dark grey (ash) clouds observed over the eruptive site. White (steam) plumes rising from Gígjökull, north of the eruption site.
Tephra fallout: Moderate ash-fall reported in the village of Vík (12:00 GMT), located 40 km south-east of Eyjafjallajökull.
Lightning: No detections today over the eruption site (18:00 GMT).
Noises: Booming sounds heard during the night and throughout the day up to 40 km south-east of the eruption site.
Additional note: Plumes of white steam extend partway down Gígjökull. Lava appears to have advanced further down Gígjökull overnight. Aerial
observations at 18:25 GMT confirmed a dense cloud of ash between 3–3.3 km a.s.l. (10,000–11,000 ft) at 60° N, 16° W (~470 km south-east of
Iceland). London VAAC have been informed about this siting.
Before 16:00 GMT, discharge levels at the old Markarfljóts bridge, ~18 km downstream from Gígjökull, were noticeably lower than yesterday's
levels. Between 16:00–17:00 GMT, a meltwater pulse was detected at the bridge; the flood was comparable in size to earlier floods on 30 April. At
19:40 GMT, web-camera images of Gígjökull showed plumes of steam rising from the glacier edge. Additionally, steam is rising from the delta that
occupies the lake basin, suggesting
the discharge of near-boiling meltwater.
Conditions at eruption site:
Explosive activity has increased somewhat over the last 2–3 days; mass flux in the plume is estimated at 10–20 tonnes/s. A scoria cone continues
to form at the eruption site. Lava is propagating down Gígjökull and most of its energy is being used to melt ice. As lava advances down-glacier,
the size of the ice canyon increases. Large plumes of steam are produced where lava is in contact with ice and meltwater.
During the last 30 hours, tremor levels have intensified. This intensification could be due to lava-ice interactions within Gígjökull, or conditions
at the eruption site.
No locatable seismicity detected beneath Eyjafjallajökull.
Horizontal displacement towards the centre of the volcano, in addition to vertical subsidence. In the last couple of days increased subsidence has
been observed at stations closest to the eruptive crater. These observations are consistent with deflation of a magma reservoir beneath
Eyjafjallajökull, although the deformation pattern has changed somewhat.
See overall assessment.
No measurable geophysical changes within the Katla volcano.