Active tectonics of the Hellenic subduction zone by Beth Shaw

By Beth Shaw

This thesis is striking for the big variety of the recommendations and observations used and for its insights, which move numerous disciplines. It starts via fixing a recognized puzzle of the traditional global, that is what should be blamed for the tsunami that destroyed settlements within the jap Mediterranean in 365 advert. by way of radiocarbon courting 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 might have the features defined via historical writers, and makes use of smooth GPS measurements and beach geomorphology to teach that the tension build-up close to Crete calls for this type of tsunami-earthquake approximately each 6.000 years - an immense perception into Mediterranean tsunami danger. a close seismological learn of earthquakes within the Cretan arc during the last 50 years unearths different vital positive aspects of its behaviour that have been formerly unknown. ultimately, she offers primary insights into the constraints 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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1 mm/year. Such shortening is a small fraction of the total Nubia-Aegean convergence, confirming that the majority of the convergence is taken up by steady sliding along the subduction zone interface. However, this small amount of contraction can be explained by locking on a fault to the south-west of Crete. If we assume that elastic strain builds up because of a variation of slip rate with depth, we can calculate what proportion of the 35 mm/year convergence is going into locking. 7 Future Tsunamigenic Earthquakes in the Hellenic Subduction Zone 25 Fig.

9) is shown by red line. b Vertically exaggerated topography showing the locations of the Mediterranean Ridge and Hellenic Trench. c Topography and seismicity projected onto a vertical section along dotted line in the centre of panel (a), with our interpretation of the structure. The plate interface is shown by a black line and focal mechanisms, the best-fitting fault (Fig. 9) by a red line. Symbols for hypocentres in (c) as for epicentres in (a). The brown region represents the subducting African lithosphere and the green region is the overriding Aegean the candidate faults are their dips, the distance from Crete that they project to the surface, and the amount of slip.

0 earthquake. The size of symbols used to represent earthquakes in maps in this chapter is large compared with this uncertainty in epicentral location, so the true location is likely to lie within the symbols. My subsequent interpretations are not sensitive to errors of this scale. 2. 2 d(km) Offset azimuth ◦ from N Source 1 6 11 10 11 11 7 117◦ 123◦ 186◦ 131◦ 91◦ 30◦ 277◦ Meier et al. [38] Hatzfeld et al. [37] Hatzfeld et al. [37] Hatzfeld et al. [36] Hatzfeld et al. [36] Hatzfeld et al. [36] Hatzfeld et al.

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