Karthala, Comoros

Karthala

Volcano Type: Shield volcano
Volcano Status: Historical
Last Known Eruption: 2007
Summit Elevation: 2361 m    7,746 feet
Latitude: 11.75°S   11°45’0″S
Longitude: 43.38°E   43°23’0″E

Karthala volcano is located on Grande Comore, the most westerly of four volcanic islands comprising the Comores Archipelago, between northern Madagascar and Mozambique. Karthala occupies the southern half of Grand Comore Island.

The islands of the Comores archipelago become progressively younger westwards towards Karthala volcano.

Satellite view of Karthala

Satellite view of Karthala

The caldera, is elliptical in shape, 4 km long and 3 km wide, with outer walls around 100 m high. It is dominated by a large central pit crater, Chahale, which is 1300 m long, 800 m wide, and 300 m deep. A smaller cylindrical pit crater 250 m in diameter and 30 m deep, Changomeni, is found one km north of Chahale.

On the way to the Summit

On the way to the Summit

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Originally posted 2010-10-19 04:22:08.

La Grille, Comoros

La Grille Volcano

Volcano Type: Shield volcano
Volcano Status: Holocene
Last Known Eruption: Unknown
Summit Elevation: 1087 m   3,566 feet
Latitude: 11.47°S   11°28’0″S
Longitude: 43.33°E   43°20’0″E

La Grille shield volcano at the northern end of Grand Comore Island (also known as Ngazidja) lacks a summit caldera like its larger and more well-known neighbor to the south, Karthala volcano. The basaltic La Grille volcano also contrasts with Karthala in its abundance of pyroclastic cones up to 800 m in height. The cones were erupted along fissures paralleling the summit ridge, which has an irregular profile and is elongated in a N-S direction, and from radial fissures that reach as far as the coast. Recent lava flows, some perhaps as young as a few hundred years, have reached the sea from fissures on the lower western, northern, and eastern flanks.

La Grille

La Grille

Originally posted 2010-10-20 04:43:29.