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Worldwide Database of Volcanic Ground Deformation


Volcano number: 222100
Region: Africa and Red Sea
Country: Kenya
Geodetic measurements? Yes
Deformation observation? Yes
Measurement method(s): InSAR
Duration of observation: 2004 - 2010
Inferred cause of deformation: Hydrothermal, Magmatic
Characteristics of deformation:

Two phases of deformation are observed at Longonot volcano between 2004 and 2010 (Robertson, 2015; Biggs et al 2009).
June 2004 – March 2006: Biggs et al. (2009) report 4.5 +/- 0.5 cm/yr uplift (ENVISAT). The signal is elliptical, orientated NW-SE, and centred to the western edge of the volcano summit. This signal is best modelled using a penny shaped crack geometry, at 3.7 km depth, and 5.9 km radius.
January 2007 – July 2010: Subsidence of 0.4 +/- 0.4 cm/yr is observed to the SE of the volcano summit. This signal has a radius of 6 km and is nearly circular. A time series of this signal suggests the deformation is linear. This subsidence is best modelled as a point source at 2.3 km.

References: 'Biggs, J., Anthony, E. Y., & Ebinger, C. J. (2009). Multiple inflation and deflation events at Kenyan volcanoes, East African Rift. Geology, 37(11), 979-982.', 'Robertson, E. 2015. Magma storage and transport at Kenyan Rift volcanoes: a remote sensing perspective. Chapter 2. Ph.D Thesis, University of Bristol, UK.', 'Smithsonian Institution Global Volcanism Program
Location: 36.446, -0.914