Paka

Volcano number:222053
Region:Africa and Red Sea
Country:Kenya
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:May 2006 - July 2010
Inferred cause of deformation:
Characteristics of deformation:

Five stages of deformation have been observed at Paka between 2006 and 2010, identifying two distinct sources (Robertson, 2015).

May-July 2006: Uplift of ~2.8 +/- 0.6 cm/yr of Paka southern flank. This deformation is best fit by a penny shaped crack source geometry (1.3 km deep, 6.4 km radius).

July-August 2006: NE flank uplift. Rapid uplift (95 +/- 1.3 cm/yr LOS) is observed on Pakas NE flank, which could be modelled at with Mogi geometry at a depth of 5.2 km.

August 2006 – January 2007: NE flank uplift. Uplift at the NE flank continues, but at a slower rate (14.5 +/- 1.2 cm/yr). A Mogi source geometry, at a depth of 2.6 km, fits this deformation also.

January 2007 – February 2008: NE and S flank uplift. Uplift of 4 +/- 1.4 cm/yr is observed at both flanks.  The data is best modelled using two Mogi sources (fixed at the locations given by the earlier deformation phases), at depths of 4.3 km (S) and 2.8 km (NE).

February 2008 – July 2010: NE flank subsidence, S flank uplift. 2.5 +/- 0.9 cm/yr of uplift is observed at the southern flank. Subsidence on the NE flank is of the same rate.

Reference:Robertson, E. 2015. Magma storage and transport at Kenyan Rift volcanoes: a remote sensing perspective. Chapter 2. Ph.D Thesis, University of Bristol, UK.
Reference:Smithsonian Institution Global Volcanism Program
http://volcano.si.edu/volcano.cfm?vn= 222053
Location:36.18, 0.92

Paka volcano, as seen from the NW. The summit caldera (1.5 km wide) can be seen in the top right corner. Photo by Martin Smith, 1993 (copyright British Geological Survey, NERC).