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Manda Hararo volcano (Ethiopia, Afar triangle), activity summary Aug 2007

jeudi août 23, 2007 16:16 |

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.
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Source:
  • Source: GVP/USGS Weekly Volcanic Activity Report, 15-21 August 2007
Actualités précédentes
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.

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Lava flows on Hawaii - new photos from Nov 06-April 07
samedi, avril 14, 2007

New photos from lava flows on Kilauea volcano on Hawaii, taken during the past months on our tours, have been posted online.

[details]

vendredi, mars 16, 2007

Tom and Marco visited Stromboli's recent eruption in early March. Sets of new photographs have been posted.

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lundi, nov. 13, 2006

We gladly announce two new study&walking tours we can offer you in Italy: one to the Bay of Naples from 8-15 April and a two-weeks tour of the Eolian Islands from 6-18 May 2007. Both tours will be guided by our Italian geologist Marta who is a true insider in both areas.

[details]
samedi, juil. 29, 2006

A set of photos from our recent expediton to Nyiragongo volcano has been posted. The next tour to see this unique volcano and the endangered mountain gorilllas of the Virunga volcanic chain is now set to 21-28 Jan. 2007. Details on this page.

[details]

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