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The Global Volcanism Program has no activity reports for North Island.
The Global Volcanism Program has no Weekly Reports available for North Island.
The Global Volcanism Program has no Bulletin Reports available for North Island.
The small, 2-km-wide North Island in Lake Turkana is the northernmost and smallest of three volcanic islands in the lake. North Island is the summit of Kenya's northernmost rift valley volcano and is primarily composed of trachyandesitic-to-trachytic phreatomagmatic deposits from overlapping eroded tuff cones or tuff rings. The center of the island consists of a young tuff ring about 1 km in diameter nested inside an older tuff ring. Two fresh unvegetated lava flows that reach the lake shore from the central tuff ring form lava deltas at the northern and western sides of the island; the northern delta is about 900 m wide. The two blocky lava flows are younger than a terrace that formed less than 10,000 years ago during the last major high-water level of Lake Turkana (Key and Watkins, 1988). Geothermal activity occurs along a curvilinear ridge on the southern half of the island and on wave-cut platforms and beaches on the SW shoreline.
The Global Volcanism Program is not aware of any Holocene eruptions from North Island. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the North Island page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
The Global Volcanism Program has no synonyms or subfeatures listed for North Island.
|North Island in the north-central part of elongated Lake Turkana is the northernmost and smallest of three volcanic islands in the lake. The two fresh unvegetated lava flows from a central tuff ring reach the lakeshore and form lava deltas. The broad northern flow (left) originated from a vent on the flank of the tuff ring and produced a 900-m-wide, lobate delta. The western flow (lower right) moved from the central vent through a breach in the western crater wall. Fumarolic activity occurs along the light-colored ridge at the top and along the SW coast.
Photo by Martin Smith, 1993 (copyright British Geological Survey, NERC).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
Bloomer S H, Curtis P C, Karson J A, 1989. Geochemical variation of Quaternary basaltic volcanoes in the Turkana Rift, northern Kenya. J African Earth Sci, 8: 511-532.
Brown F H, Carmichael I S E, 1971. Quaternary volcanoes of the Lake Rudolf region: II. The lavas of North Island, South Island and The Barrier. Lithos, 4: 305-323.
Brown F H, Carmichael I S E, 1969. Quaternary volcanics of the Lake Rudolf Region, 1. The Korath Range. Lithos, 2: 239-260.
Dunkley P N, Smith M, Allen D A, Darling W G, 1993. The geothermal activity and geology of the northern sector of the Kenya Rift Valley. Brit Geol Surv Res Rpt, SC/93/1: 1-185.
Karson J A, Curtis P C, 1994. Axial Quaternary volcanic centers in the Turkana rift, N. Kenya. J African Earth Sci, 18: 15-35.
Key R M, Watkins R T, 1988. Geology of the Sabarei area. Rpt Mines Geol Dept Kenya, 111: 1-57.
Smith M, 1991. . (pers. comm.).