BIROn - Birkbeck Institutional Research Online

    Seismicity of the central Afar rift and implications for Tendaho dam hazards

    Ayele, A. and Ebinger, C.J. and van Alstyne, C. and Keir, D. and Nixon, C.W. and Belachew, M. and Hammond, James O.S. (2015) Seismicity of the central Afar rift and implications for Tendaho dam hazards. Geological Society, London, Special Publications 420 , ISSN 0305-8719.

    Geological Society, London, Special Publications-2015-Ayele-SP420.9.pdf - Published Version of Record
    Available under License Creative Commons Attribution.

    Download (6MB) | Preview


    Temporary broadband seismic networks deployed from 2007 to 2011 around the Afar triple junction of the East African Rift System provide insights into seismicity patterns of the actively deforming crust around the 1.86 km3 impounded lake system behind the Tendaho dam. The observed seismicity correlates well with the active magmatic centres around central Afar. The area around the dam site is characterized by a network of intersecting NNE- and NW-trending faults. Seismicity clusters observed in the specified time interval indicate that both fault sets are active and are potential sources of seismogenic hazards. The dam neighbourhood is naturally active and it is a challenge to associate the observed seismic activity to either a change in magmato-tectonic conditions or attribute it to the influence of reservoir load. It is evident that the dam region experi- ences high levels of seismic and volcano-tectonic unrest, regardless of the origin of the activity. The spatial overlap of narrow zones of crustal seismicity and upper mantle low velocity zones observed in S-wave tomography models suggests that melt production zones guide the distribution of strain during continental rupture. Given its volcanically and seismically active setting, the Tendaho dam site and the surrounding region require continuous monitoring for the safety of downstream popu- lations and development infrastructures in the Afar National Regional State of Ethiopia.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: James Hammond
    Date Deposited: 10 Nov 2015 16:50
    Last Modified: 02 Aug 2023 17:19


    Activity Overview
    6 month trend
    6 month trend

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item