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首页> 外文期刊>International Journal of Geophysics >Integrated remote sensing and geophysical investigations of the geodynamic activities at Lake Magadi, Southern Kenyan rift
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Integrated remote sensing and geophysical investigations of the geodynamic activities at Lake Magadi, Southern Kenyan rift

机译：肯尼亚南部裂谷马加迪湖的地球动力学活动的综合遥感和地球物理研究

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摘要

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.
机译：利用ASTER数据和地球物理方法研究了肯尼亚南部裂谷系统马加迪湖的构造构造和热结构。确定了五个靠近已知温泉的N-S断层，用于地电地面调查。航空数据被用来进一步探测更大深度的断层并确定居里点深度。结果表明，漏斗状的充满流体的（主要是盐水热液）区域具有相对较低的电阻率值，其小于1Ω-m，由向西和向东的电阻性结构分隔，沿电阻率曲线的深度为75 m。有证据表明盐水热液通过断层张开流向地面。所观察到的断层从地表延伸到7.5 km的深度，可能是横向限制被抓物的断层。它们是研究区域向上热通量的主要管道。航空电磁波谱分析还显示了热源在约12 km处的位置。相对浅层意味着沿湖缘温泉表面表现出的高地热梯度。热源与震源的相关性表明，成岩带直接存在于岩浆侵入带之上，形成了地球动力学活动的开始。

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