Longonot - Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics

Observations of 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(s) 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.
Reference(s):	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 http://volcano.si.edu/volcano.cfm?vn=222100
Location:	-0.914, 36.446
REST API endpoint (JSON):	https://comet.nerc.ac.uk/wp-json/volcanodb/v1/volcano/3208