No latest activity reported for Longonot.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

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.

Richard J J, Neumann van Padang M, 1957. Africa and the Red Sea. {Catalog of Active Volcanoes of the World and Solfatara Fields}, Rome: IAVCEI 4: 1-118

Rogers N W, Evans P J, Blake S, Scott S C, Hawkesworth C J, 2004. Rates and timescales of fractional crystallization from 238U-230Th-226Ra disequilibria in trachyte lavas from Longonot volcano, Kenya. {J Petr}, 45: 1747-1776

Scott S C, 1980. The geology of Longonot volcano, Central Kenya: a question of volumes. {Phil Trans Roy Soc London}, Ser A, 296: 438-466

Thompson A O, Dodson R G, 1963. Geology of the Naivasha area. {Geol Surv Kenya Rpt}, 55: 1-80

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 trachytic Longonot stratovolcano SE of Lake Naivasha in the Gregory Rift valley contains a 8 x 12 km caldera. Formation of the caldera accompanied large explosive eruptions about 21,000 years ago. A large central cone that was constructed within the caldera forms the 2776-m-high summit of the volcano. The younger cone is truncated by a circular, 1.8-km-wide crater. Post-caldera lavas are found on the caldera floor and the volcano's flanks, marking a late stage of effusive eruptions. A well-preserved satellitic cone is located on the NE flank. Masai tradition records a lava flow on the northern flank during the 19th century. Similarly youthful-looking lava flows occur on the SW flank.