Manda Hararo volcano (Ethiopia, Afar triangle), activity summary Aug 2007
jeudi août 23, 2007 18:16 |
A large sulfur dioxide plume and several thermal anomalies from Manda Hararo were detected in satellite imagery on 13 August. On 16 August, a field team conducted aerial and ground observations of a locality known as Karbahi, a graben area with numerous active faults, fissures, and basalt flows, NW of the center of Manda Hararo. Observations revealed active volcanism, including isolated areas of intense gas emission and visible sulfur deposits. Basaltic lava flowed from long fissures, predominantly to the W of the graben floor. Each fissure was covered by a continuous row of small and closely spaced spatter and scoria cones 2-10 m high. Spatter and scoria deposits ranged in size from coarse lapilli to bombs. Incandescence and occasionally small flames were emitted from the tops of some of the cones.
Observed 'a'a and pahoehoe flows traveled a few hundred meters from the vents. The overall thickness of the flows varied but reached several meters in places. Lava channels and lava tubes were abundant. Fault scarps with fresh breaks and rockfalls were noted. The area affected by tectonic and volcanic activity was an estimated 5-7 km long and 1 km wide.
According to eye-witness accounts, a cracking sound was heard and a tremor was felt on 12 August. On 13 August, "fire" was seen that lit up a large area. "Fire and smoke" continued with variable intensity until 16 August. No damage to life or property was reported.
jeudi, août 16, 2007
"Volcanoes Live! - from the "Siebengebirge" to Hawaii"... [details]
vendredi, juin 29, 2007
The dates for the new expedition to Erta Ale volcano and the Danakil depression in Ethiopia are now set at 25 Jan - 8 Feb. 2008. For details of the program, go here.[details]
samedi, avril 14, 2007
vendredi, mars 16, 2007
mardi, nov. 28, 2006
Tobias Schorr will present active volcanoes (with some of Toms great photos) in Europe in the bistro "Hollywood" in Siegburg. 12 December 19:30.[details]
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