dc.contributor.author | Deng, Anyak W | |
dc.date.accessioned | 2013-02-14T11:15:49Z | |
dc.date.issued | 2010 | |
dc.identifier.citation | Master of Science in Geology (Applied Geophysics) | en |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/9873 | |
dc.description.abstract | This study focuses on the application of the magnetic method as a mapping tool for
determining the depth of volcano-sedimentary formations and detection of subsurface
structural features in Olobanita wellfield basin, Central Kenya rift.
The frame work of the study looks at the prominent fault systems within the Olobanita
wellfield basin and alongside the soft loose volcano-sedimentary, therefore this study is
meant to establish subsurface shallow structures that are controlling and influencing the
groundwater movement.
The objectives of this study are to determine the extent to which the structures and depth to
volcano-sedimentary formation influence the hydrogeology of the basin and map the shallow
structural features beneath the basin.
In total twenty one magnetic profile lines were established. Magnetic anomalies are
particularly useful in the study of basement structures of sedimentary basins because
sediments are usually weakly magnetic and do not contribute to the observed anomaly.
The structure of the rift floor influences the axial geometry and the surface process. Simiyu
and Keller (2001) interpret the rift floor structures due to thickening related to the pre-rift
crustal type and processes.
The methods used in this study are Euler deconvolution method and analytic signal. The
Euler deconvolution was implemented for analysis of magnetic data to establish depth to
magnetic sources, the effect of the complexity of the magnetic anomaly shapes has direct
influence on the depth results.
Analytic signal used to grid the magnetic data and revealed the amplitude of magnetization.
Pronounced magnetic anomaly map was produced, the signal shape confirmed that the
magnetic anomalies are caused by buried fault systems and the analytic signal map depicts
some well oriented shaped anomalies related to the subsurface structures (faults).
Interpretation of the results quantitatively and qualitatively revealed four normal faults,
minor faults and fractures zone that dissect the study area in N-S direction.
The depth to magnetic sources was established at depths ranges from 5m to 1000m bgl. The
results obtained indicate possible deeper aquifers can be reach at depth of approximately
400m bgl.
The geology of the Olobanita wellfield is not much different from rift valley areas and is
comprises of Tertiary to Quaternary volcanic suites and sediments units intercalated within
the succession of the Lakes bed and therefore the volcano- sedimentary formations are the
main source of groundwater. | en |
dc.language.iso | en | en |
dc.publisher | University of Nairobi | en |
dc.subject | OLOBANITA WELLFIELD LOWER BARINGO BASIN | en |
dc.subject | HYDROGEOLOGY | en |
dc.title | Amagnetic study of the shallow structure in the olobanita wellfield lower baringo basin, kenya rift: implication on the hydrogeology of the basin | en |
dc.type | Thesis | en |
local.embargo.terms | 6 months | en |
local.publisher | Geology | en |