Gravity Survey of Lake Magadi Area
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Date
2005
Authors
Githiri, l. G.
Waithaka, J. W.
Okumu, J
Stangl, R. L.
Journal Title
Journal ISSN
Volume Title
Publisher
Faculty of Science Kenyatta University
Abstract
A gravity survey was conducted in the area surrounding Lake Magadi to investigate presence of
any geological bodies related to high heat [low in the area. Gravity stations were established by
filling up the unsurveyed sectors in a previous Leicester gravity study, Gravity data collected in
the area was subjected to necessary corrections and a Bouguer anomaly map drawn. The
Bouguer gravity values were found to range from -1800 to -1680 gu with the maximum peak
occurring at the NNE part of the project area. Forward modeling along selected profiles p-q, mn,
c-d and h-g was done. Depths to the top of bodies pq, mn, cd and hg were found to be 0.2-
0.7, 0.15, 0.5, and 0.04 km, while depths to the bottom' were modeled as 4.0, 6.0, 4.0 and 3.6
km, respectively. The bodies have density contrasts ranging from 280-340 kg/m3 and were
modeled all dike like structures elongated in N-S and NNW-SSE directions. This direction is
nearly the characteristic trend of tectonic structures in the rift valley. A model where the dikes
originate from a shallow magma chamber is proposed.
Description
Research Article
Keywords
Gravity, Anomalies, Magadi, Survey
Citation
East African Journal of Physical Sciences 6(2): 89-100 (2005)