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Available Weekly Reports
There are no Weekly Reports available for Silali.
Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|5050 BCE ± 1000 years||Unknown||Confirmed||Ar/Ar||Upper east flank|
|6050 BCE ± 1000 years||Unknown||Confirmed||Ar/Ar||Eastern part of caldera|
|7050 BCE ± 1000 years||Unknown||Confirmed||Ar/Ar||Upper east flank|
The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. 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. Additional discussion of data sources can be found under Volcano Data Criteria.
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.
Key R M, 1987a. Geology of the Maralal area. Rpt Mines Geol Dept Kenya, 105: 1-93.
Macdonald R, Davies G R, Upton B G, Dunkley P N, Smith M, Leat P T, 1995. Petrogenesis of Silali volcano, Gregory Rift, Kenya. J Geol Soc London, 152: 703-720.
Smith M, Dunkley P N, Deino A, Williams L A J, McCall G J H, 1995. Geochronology, stratigraphy and structural evolution of Silali volcano, Gregory Rift, Kenya. J Geol Soc London, 152: 297-310.
Williams L A J, 1970. The volcanics of the Gregory Rift Valley, East Africa. Bull Volc, 34: 439-465.
Williams L A J, Macdonald R, Chapman G R, 1984. Late Quaternary caldera volcanoes of the Kenya Rift Valley. J Geophys Res, 89: 8553-8570.
The 30-km-wide Silali trachytic shield volcano, the largest Quaternary volcano in the northern Gregory Rift, completely straddles the East African Rift. An impressive 5 x 8 km summit caldera with 300 m deep walls is thought to have formed about 63,000 years ago. Caldera formation is thought to have been incremental, related to eruption of the Kantenmening basaltic and trachytic lava flows. A series of summit-area lava benches formed by eruptions from circumferential fissures has produced a volcano morphologically similar to Galapagos Islands volcanoes. Northern, eastern, and southern flanks are cut by a prominent broad rift zone 10-km wide and 30-km long, dotted with numerous pyroclastic cones. Lava domes on the upper eastern flank formed during the late Pleistocene and early Holocene, until about 7 ka. Youthful parasitic cones abound on the caldera floor and on the northern and NE flanks; the youngest lava flows may be little more than a few hundred years old (Williams et al. 1984). Geothermal activity occurs within the caldera and on the upper eastern flanks.