Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift
The tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for geoelectric ground investigation. Aeromagnetic data were employed to further probe fau...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2012/318301 |
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| author | Akinola Adesuji Komolafe Zacharia Njuguna Kuria Tsehaie Woldai Marleen Noomen Adeleye Yekini Biodun Anifowose |
| author_facet | Akinola Adesuji Komolafe Zacharia Njuguna Kuria Tsehaie Woldai Marleen Noomen Adeleye Yekini Biodun Anifowose |
| author_sort | Akinola Adesuji Komolafe |
| collection | DOAJ |
| description | The tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for geoelectric ground investigation. Aeromagnetic data were employed to further probe faults at greater depths and determine the Curie-point depth. Results indicate a funnel-shaped fluid-filled (mostly saline hydrothermal) zone with relatively low resistivity values of less than 1 Ω-m, separated by resistive structures to the west and east, to a depth of 75 m along the resistivity profiles. There was evidence of saline hydrothermal fluid flow toward the surface through the fault splays. The observed faults extend from the surface to a depth of 7.5 km and are probably the ones that bound the graben laterally. They serve as major conduits for the upward heat flux in the study area. The aeromagnetics spectral analysis also revealed heat source emplacement at a depth of about 12 km. The relative shallowness implies a high geothermal gradient evidenced in the surface manifestations of hot springs along the lake margins. Correlation of the heat source with the hypocenters showed that the seismogenetic zone exists directly above the magmatic intrusion, forming the commencement of geodynamic activities. |
| format | Article |
| id | doaj-art-62b5746e8eb942a687ea0fb97fa626a7 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-62b5746e8eb942a687ea0fb97fa626a72025-02-03T01:25:07ZengWileyInternational Journal of Geophysics1687-885X1687-88682012-01-01201210.1155/2012/318301318301Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan RiftAkinola Adesuji Komolafe0Zacharia Njuguna Kuria1Tsehaie Woldai2Marleen Noomen3Adeleye Yekini Biodun Anifowose4Department of Remote Sensing and Geoscience Information System, The Federal University of Technology Akure, PMB 704, Ondo State, Akure 340001, NigeriaDepartment of Geology, University of Nairobi, P.O. Box 30197-100, Nairobi, KenyaInternational Institute for Geoinformation Science and Earth Observation (ITC), University of Twente, 7500 AE Enschede, The NetherlandsInternational Institute for Geoinformation Science and Earth Observation (ITC), University of Twente, 7500 AE Enschede, The NetherlandsDepartment of Remote Sensing and Geoscience Information System, The Federal University of Technology Akure, PMB 704, Ondo State, Akure 340001, NigeriaThe tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for geoelectric ground investigation. Aeromagnetic data were employed to further probe faults at greater depths and determine the Curie-point depth. Results indicate a funnel-shaped fluid-filled (mostly saline hydrothermal) zone with relatively low resistivity values of less than 1 Ω-m, separated by resistive structures to the west and east, to a depth of 75 m along the resistivity profiles. There was evidence of saline hydrothermal fluid flow toward the surface through the fault splays. The observed faults extend from the surface to a depth of 7.5 km and are probably the ones that bound the graben laterally. They serve as major conduits for the upward heat flux in the study area. The aeromagnetics spectral analysis also revealed heat source emplacement at a depth of about 12 km. The relative shallowness implies a high geothermal gradient evidenced in the surface manifestations of hot springs along the lake margins. Correlation of the heat source with the hypocenters showed that the seismogenetic zone exists directly above the magmatic intrusion, forming the commencement of geodynamic activities.http://dx.doi.org/10.1155/2012/318301 |
| spellingShingle | Akinola Adesuji Komolafe Zacharia Njuguna Kuria Tsehaie Woldai Marleen Noomen Adeleye Yekini Biodun Anifowose Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift International Journal of Geophysics |
| title | Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift |
| title_full | Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift |
| title_fullStr | Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift |
| title_full_unstemmed | Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift |
| title_short | Integrated Remote Sensing and Geophysical Investigations of the Geodynamic Activities at Lake Magadi, Southern Kenyan Rift |
| title_sort | integrated remote sensing and geophysical investigations of the geodynamic activities at lake magadi southern kenyan rift |
| url | http://dx.doi.org/10.1155/2012/318301 |
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