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From: Last Post on 31 Mar 2010 20:39
EYJAFJOLL Southern Iceland
63.63°N, 19.62°W; summit elev. 1666 m

According to news articles, the fissure eruption from Eyjafjöll
continued during 24-30 March. On 24 March, steam explosions were seen.
A local scientist described four or five active craters and a 200-
meter-high basalt lava-fall into Hrunagil canyon. Two days later
reports indicated that lava flows had changed course and had entered
the Hvannárgil canyon down a 100-meter-high lava-fall; water levels in
that drainage increased. From a helicopter on 28 March, scientists saw
lava flowing into both canyons and noted fewer jets of lava. The next
evening a swarm of earthquakes in the region measuring M 2-2.5 were
detected. A geophysicist noted that seismicity was gradually
decreasing. The lava covered an area of 1 square kilometer.

Geologic Summary. Eyjafjöll (also known as Eyjafjallajökull) is
located immediately west of Katla volcano. Eyjafjöll consists of an E-
W-trending, elongated ice-covered basaltic-andesite stratovolcano with
a 2.5-km-wide summit caldera. Fissure-fed lava flows occur on both the
eastern and western flanks of the volcano, but are more prominent on
the western side. Although the 1666-m-high volcano has erupted during
historical time, it has been less active than other volcanoes of
Iceland's eastern volcanic zone, and relatively few Holocene lava
flows are known. The sole historical eruption of Eyjafjöll, prior to
an eruption in 2010, produced intermediate-to-silicic tephra from the
central caldera during December 1821 to January 1823.

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