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Karthala volcano

Updated: Sep 28, 2022 10:39 GMT -
Shield volcano 2361 m (7,746 ft)
Comores, western Indian Ocean, -11.77°S / 43.36°E
Current status: restless (2 out of 5)
Last update: 7 Sep 2022 (Smithsonian / USGS Weekly Volcanic Activity Report)
Karthala with the lava lake in the summit crater (2006 eruption)
Karthala with the lava lake in the summit crater (2006 eruption)

Karthala is a large shield volcano with a summit caldera on La Grande Island of the Comores in the western Indian Ocean. It erupts every few years and often produces voluminous lava flows and sometimes has a lava lake in the crater of the caldera.

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Typical eruption style: Effusive. Temporary lava lakes.
Karthala volcano eruptions: 1808, 1814, 1821, 1828, 1830, 1833, 1848, 1850, 1855, 1857, 1858, 1859, 1860, 1862(?), 1872, 1876, 1880, 1883-84, 1904, 1910, 1918, 1928, 1948, 1952, 1956, 1965, 1972, 1977, 1991, 2005, 2005, 2006

Latest nearby earthquakes

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Background

Karthala, a typical and very active shield volcano, forms the southern part of the Comores island La Grande Comore (also known as Ngazidja Island). It erupted twice in 2005 and caused major problems due to extensive ash fall and contamination of drinking water.

Karthala has an elongated 3 x 4 km summit caldera created by repeated collapse, and has elongated rift zones extend to the NNW and SE from the summit. Historical eruptions both from summit and flank vents have repeatedly modified the shape of the caldera. Many lava flows have reached the sea on both sides of the island. A lava flow during the euption in 1860 traveled from the summit caldera about 13 km to the NW, reached the sea at the western coast north of the capital city of Moroni.

Karthala Photos




See also: Sentinel hub | Landsat 8 | NASA FIRMS

Background:

Karthala, a typical and very active shield volcano, forms the southern part of the Comores island La Grande Comore (also known as Ngazidja Island). It erupted twice in 2005 and caused major problems due to extensive ash fall and contamination of drinking water.


Karthala has an elongated 3 x 4 km summit caldera created by repeated collapse, and has elongated rift zones extend to the NNW and SE from the summit. Historical eruptions both from summit and flank vents have repeatedly modified the shape of the caldera. Many lava flows have reached the sea on both sides of the island. A lava flow during the euption in 1860 traveled from the summit caldera about 13 km to the NW, reached the sea at the western coast north of the capital city of Moroni.


Wed, 7 Sep 2022, 14:00

Karthala volcano (Grand Comore Island) - Smithsonian / USGS Weekly Volcanic Activity Report for 31 August-6 September 2022 (New Activity / Unrest)

According to the Direction Générale de la Sécurité Civile – Comores, the Observatoire Volcanologique du Karthala (OVK) reported that a significant increase in the number of small earthquakes beneath Karthala's W flank began to be detected on 15 July. The abnormal activity persisted, so on 16 August the Alert Level was raised to Yellow (the lowest level on a three-level scale) and residents were asked to limit activities on and around the volcano. On 5 September OVK recommended that the Alert Level remain at Yellow. ... Read all
Thu, 1 Sep 2022, 10:00

Karthala volcano (Grand Comore Island) - Smithsonian / USGS Weekly Volcanic Activity Report for 31 August-6 September 2022 (New Activity / Unrest)

According to the Direction Générale de la Sécurité Civile – Comores, the Observatoire Volcanologique du Karthala (OVK) reported that a significant increase in the number of small earthquakes beneath Karthala's W flank began to be detected on 15 July. The abnormal activity persisted, so on 16 August the Alert Level was raised to Yellow (the lowest level on a three-level scale) and residents were asked to limit activities on and around the volcano. On 5 September OVK recommended that the Alert Level remain at Yellow. ... Read all
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