Download e-book for iPad: Active tectonics of the Hellenic subduction zone by Beth Shaw

By Beth Shaw

ISBN-10: 3642208037

ISBN-13: 9783642208034

This thesis is impressive for the big variety of the options and observations used and for its insights, which pass a number of disciplines. It starts off through fixing a recognized puzzle of the traditional global, that's what should be blamed for the tsunami that destroyed settlements within the japanese Mediterranean in 365 advert. through radiocarbon relationship of preserved marine organisms, Shaw demonstrates that the full of western Crete was once lifted out of the ocean through as much as 10 meters in an immense earthquake at the moment, which occured on a formerly unknown fault. the writer indicates that the ensuing tsunami may have the features defined via old writers, and makes use of glossy GPS measurements and beach geomorphology to teach that the stress build-up close to Crete calls for the sort of tsunami-earthquake approximately each 6.000 years - an important perception into Mediterranean tsunami risk. an in depth seismological learn of earthquakes within the Cretan arc over the past 50 years finds different vital positive aspects of its behaviour that have been formerly unknown. eventually, she offers primary insights into the restrictions of radiocarbon relationship marine organisms, when it comes to how they secrete carbon into their skeletons. The thesis ended in 3 significant papers in most sensible journals.

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Chlieh, L. -P. Avouac, Y. Bock, K. J. H. Natawidjaja, R. McCaffret, Plate-boundary deformation associated with the great Sumatra– Andaman earthquake. Nature 440, 46–51 (2006) 25. R. Bilham, P. England, Plateau pop-up in the great (1987) Assam earthquake. Nature 410, 806–809 (2001) 26. R. C. D. H. E. B. Umpleby, A nonhydrostatic finite-element model for three-dimensional stratified oceanic flows. Part I: model formulation. Monthly Weather Rev. 132, 2816–2831 (2004) 27. J. D. C. E. P. H. Goddard, Optical bathymetric representation through constrained unstructured mesh adaptivity.

The direct wave travels to the north African coast and into the Adriatic, consistent with the historical record. e Sketch map of Alexandria at the time of the AD 365 earthquake. The island of Pharos was connected to the mainland by a narrow causeway, known as the Heptastadion, which was overtopped by the tsunami. Our calculations show that the wave would have arrived from the SW (white arrow), explaining how the Heptastadion was inundated despite the apparent protection offered by Pharos Island against a direct wave from Crete (which lies to the NW).

8 a–c Cartoons showing the pattern of surface deformation during a seismic cycle in a typical subduction zone, modified from a cartoon by James Jackson. After an earthquake, the interface is locked (a) and the overriding plate is dragged down (b). Points seaward of the ‘hinge’ (which lies above the base of the locked zone) are dragged down, whereas points further back (above the aseismic and freely slipping part of the interface) are uplifted in the flexural bulge. During an earthquake (c) the vertical motion is suddenly reversed: the region above the seismogenic part of the interface are uplifted, and points landward of the ‘hinge’ subside.

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Active tectonics of the Hellenic subduction zone by Beth Shaw

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