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| | 講演要旨(英文) | | Magnetotelluric (MT) survey was conducted in Tendaho geothermal field, which is one of the high temperature geothermal area in Afar depression in north east Ethiopia. One hundred and one MT sites were deployed along profiles with the recorded data covering a period range from 341 Hz to 0.001 Hz to outline the reservoir and the structures. Bahr and Q-function strike direction result showed the N-S trend. The 2-D joint inversion revealed five main resistivity structures up to the depth of 5 km: low resistivity surface layer, clay alteration mineral underlain by a moderate resistive layer, high resistive structure and faults. The low resistivity surface layer can be interpreted as sediments, lateral flow of geothermal fluids or/and zeolite-clay alteration zone. Moderately high resistivity can be correlated to fractured basaltic lava flows epidote-chlorite zone and following high resistive Afar stratoid basalts or epidote alteration zone. The faults/structures can facilitate fluid flow in the study area between high and low resistivity. |
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