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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 awesome for the big variety of the concepts and observations used and for its insights, which pass numerous disciplines. It starts through fixing a well-known puzzle of the traditional global, that's what should be blamed for the tsunami that destroyed settlements within the jap Mediterranean in 365 advert. by means of radiocarbon relationship of preserved marine organisms, Shaw demonstrates that the full of western Crete was once lifted out of the ocean by means of as much as 10 meters in a huge earthquake at the moment, which occured on a formerly unknown fault. the writer exhibits that the ensuing tsunami may have the features defined by means of old writers, and makes use of sleek GPS measurements and sea coast geomorphology to teach that the stress build-up close to Crete calls for this sort of tsunami-earthquake approximately each 6.000 years - a big perception into Mediterranean tsunami probability. an in depth seismological learn of earthquakes within the Cretan arc during the last 50 years unearths different vital gains of its behaviour that have been formerly unknown. eventually, she offers primary insights into the constraints of radiocarbon relationship marine organisms, in terms of how they secrete carbon into their skeletons. The thesis ended in 3 significant papers in best journals.

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5 Examples 2 and 3: Shallow and Steep Thrust Faulting Earthquakes An important feature of the Hellenic subduction zone is that the clear bathymetric feature known as the Hellenic Trench is not the surface expression of the main subduction interface. The true geometry and location of that interface is obscured beneath thick piles of sediment which deform and slide down bathymetric gradients. I show in Sect. 5 that the larger earthquakes on the subduction interface are at depths of 15–45 km beneath the Hellenic Trench system, similar to the 20–40 km deep interface inferred to exist from microearthquakes [38] and larger earthquakes [12] beneath western and central Crete.

11). In AD 365 the offshore island of Pharos (site of the famous lighthouse) was linked to the land by a causeway, the Heptastadion, which was vulnerable to the SW and flooded by the tsunami. It was here that much destruction was concentrated. 5 The Tsunami 21 Fig. 11 Tsunami calculation. a–d Heights of the sea surface at 4, 30, 70 and 90 min after the earthquake. 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 P axis for this earthquake does trend NE-SW, and in fact this event is one of several within the downgoing African lithosphere that has a P axis parallel to the strike of the subduction zone. This is a pattern noticed near Crete by Taymaz et al. [12] that, I show later, continues round the whole arc, and may be related to the strong curvature imposed on the downgoing African plate. The reason I have confidence in attributing this earthquake to that group is because I have confidence in the focal mechanism and depth.

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Active tectonics of the Hellenic subduction zone by Beth Shaw

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