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  • 1
    Publication Date: 2019-11-04
    Description: Most of the obelisks at Alisum (Tigray, Ethiopia) are lying in pieces on the ground, as the Aksumite obelisk now in Rome had been before its removal to Italy. Preliminary inspection of the alignment of the ~larious fallen members makes it possible to identify a prevailing orientation. The historical tradition is very vague as regards the toppling of the obelisks (or stelae). Reference is made to Yodit or Gudit, a Jewish queen of the South. who supposedly had the pngnn stelae knocked down in the 10th century A.D.: to Irnam Ah~nedib n Ibrahim a1 Ghazi a1 gi-in?. Amir of Harar. who supposedly ordered thein to be felled by cannon fire: and to earthquakes. Analysis carried out on a nuruber of highly significant cases makes it possible to assert that some of the great obelisks at Aksum collapsed as a result of earthquakes. At the same time, inadequate systems of anchorage and the mediocre mechanical qualities of the soil were certainly conducive to collapse through both natural causes (earthquakes and erosion of foundations) and deliberate demolition.
    Description: JCR Journal
    Description: open
    Keywords: Ethiopia ; Aksum ; stelae ; obelisks ; earthquake ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 7762826 bytes
    Format: application/pdf
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  • 2
    Publication Date: 1995-07-01
    Print ISSN: 0016-7649
    Topics: Geosciences
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  • 3
    Publication Date: 1992-08-01
    Print ISSN: 0258-8900
    Electronic ISSN: 1432-0819
    Topics: Geosciences
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of volcanology 54 (1992), S. 484-493 
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The caldera of Santorini is a composite structure with a subsidence history extending over 100 ka or more. Geomorphological mapping shows that the present-day caldera wall is a complex assemblage of cliff surfaces of different ages, and that collapse at Santorini has repeatedly exhumed earlier caldera cliffs and unconformities. Cliffs bounding the southern, southeastern and northwestern rims of the caldera are morphologically fresh and probably formed during or soon after the Minoan eruption in the late Bronze Age. The well-scalloped shape of these cliffs is attributed to large-scale rotational landslip around the margins of the Minoan caldera. The deposit from one landslip is preserved subaerially. Minoan landslips in southeast santorini detached along the basement unconformity, exposing a cliff of the prevolcanic island. The caldera wall in the north, northeast and east preserves evidence for three generations of cliff: those of Minoan age and two earlier generations of caldera wall. The two early calderas can be dated relative to a well-established statigraphy of lavas and tuffs. The presence of in situ Minoan tephra plastered onto the present-day caldera wall provides evidence that these ancient caldera cliffs had already been exhumed prior to the Minoan eruption. Field relationships permit reconstruction of the physiography of Bronze-Age Santorini immediately before the Minoan eruption. The reconstruction differs from some previously published versions and is believed to be the most accurate to date. Bronze-Age Sa ntorini had a large flooded caldera formed 21 ka ago. This caldera must have acted as an excellent harbour for the Bronze-Age inhabitants of the island. The 3.6 ka Minoan eruption deepened and widened the extant caldera. The volume of Minoan collapse (∼25 km3) is in good agreement with published estimates for the volume of discharged magma if between 5 and 8 km3 of Minoan ignimbrite ponded as intracaldera tuff.
    Type of Medium: Electronic Resource
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