East African Rifts

East African Rifts

1st Edition - January 1, 1972

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  • Editor: R. W. Girdler
  • eBook ISBN: 9781483257150

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Developments in Geotectonics, 7: East African Rifts focuses on the movements, structure, and behavior of the East African rift system. The selection first offers information on the surface structure and plate tectonics of Afar; tectonic and magmatic significance of volcanism in the Afar depression; and preliminary interpretation of the gravity field of Afar, northeast Ethiopia. Discussions focus on crustal models of Afar based on gravity and seismic data, tectonics, volcanism, geological setting, and crustal extension. The text also elaborates on the gravity survey of the central part of the Ethiopian Rift Valley and an aeromagnetic survey of the Afar triangle of Ethiopia. The book examines the arrangement and development of continental rift zones, East African rift development, and the seismicity of the East African rift system. Topics include earthquake mechanisms, seismicity, and the main categories of rift zones. The manuscript is a dependable reference for readers interested in the East African rifts.

Table of Contents

  • Contents


    Surface Structure and Plate Tectonics of Afar

    Geological Setting. Structure. Afar Floor. Afar Margins. Crustal Extension In Afar. Afar and Plate Tectonics.

    Volcanism in the Afar Depression: Its Tectonic and Magmatic Significance

    Tectonics. Volcanism. Volcanism of Oceanic Nature. Continental Volcanism. Stratoid Volcanism. Granitic Intrusions. Activity.

    A Preliminary Interpretation of the Gravity Field of Afar, Northeast Ethiopia

    Compilation of the Bouguer Map. A Quantitative Interpretation of the Bouguer Map. Conclusions.

    A Gravity Survey of the Central Part of the Ethiopian Rift Valley

    Data. Interpretation. Correlation with Surface Geology. Models. Conclusion.

    An Aeromagnetic Survey of the Afar Triangle of Ethiopia (Abstract)

    Local Earthquake Phases Observed at Addis Ababa, Ethiopia

    Seismic Profiles in the Djibouti Area

    Results. Interpretation. Conclusion.

    Continental Rift Zones: Their Arrangement and Development

    Main Categories of Rift Zones. Main Types of Continental Rift Zones. Rift Zones of Platforms. Rift Zones of Young Folded Regions. Rifts and Rift-Like Belts. Interrelations Between Geosynchnal-Orogenic Belts and Rift Belts. Pre-Cenozoic Rift Zones and Belts.

    The Kenya Rift Volcanics: A Note On Volumes and Chemical Composition

    Distribution and Volumes. Miocene Volcanics. Pliocene Volcanics. Quaternary Volcanics. Chemical Compositions. Basalts. Trachytic Volcanics. Phonohtic Lavas. Summary and Conclusions.

    A Geochemical Study of Silali Volcano, Kenya, with Special Reference to the Origin of the Intermediate-Acid Eruptives of the Central Rift Valley

    The Eruptivity of the Central Gregory Rift Valley. Summary of the Geology of Silali. Geochemistry. Discussion. Conclusions.

    The Seismicity of the East African Rift System

    Seismicity. The Gulf of Aden. The Red Sea. East Africa. Earthquake Mechanisms. Travel Time Delays. Travel Time Delays and Gravity Anomalies.

    Study of Microearthquakes in the Rift Zones of East Africa

    Locations and Techniques. Results. Conclusion.

    Gravity and Magnetic Surveys In Northern Tanzania and Southern Kenya

    The Gravity Survey. Interpretation of the Gravity Anomalies. The Regional Bouguer Anomaly. The Axial Positive Anomaly in the Gregory Rift. The Gravity Anomalies Over The Speke Gulf Region. The Gravity Anomalies Associated with the Volcanic Province of Northern Tanzania. Conclusions.

    Report On Airmagnetic Surveys of Two Areas in the Kenya Rift Valley

    Planning of the Airmagnetic Survey. Airmagnetic Survey of the Lake Magadi Area.

    Some Comments On The Results of A Seismic Refraction Experiment in the Kenya Rift

    Structure. Seismic Refraction Experiments. Interpretation. Conclusion.

    Raleigh Wave Phase Velocities For The Path Addis Ababa-Nairobi

    Analysis and Interpretation.

    The Structure of East Africa Using Surface Wave Dispersion and Durham Seismic Array Data

    The General Seismic Structure of East Africa. Teleseismic P Wave Delay. Surface Wave Dispersion Along The Rift Zone. Seismic Array Data. Apparent Velocities of Regional Earthquake Arrivals. Apparent Velocities of Teleseismic Arrivals. Conclusions.

    Heat Flow Measurements In East Africa (Abstract)

    List of Authors

Product details

  • No. of pages: 192
  • Language: English
  • Copyright: © Elsevier 1972
  • Published: January 1, 1972
  • Imprint: Elsevier
  • eBook ISBN: 9781483257150

About the Editor

R. W. Girdler

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