Active tectonics of the Hellenic subduction zone by Beth Shaw

By Beth Shaw

This thesis is amazing for the big variety of the concepts and observations used and for its insights, which move a number of disciplines. It starts by way of fixing a recognized puzzle of the traditional global, that's what was the reason for the tsunami that destroyed settlements within the jap Mediterranean in 365 advert. by means of radiocarbon courting of preserved marine organisms, Shaw demonstrates that the complete of western Crete used to be lifted out of the ocean by way 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 through historic writers, and makes use of smooth 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 huge perception into Mediterranean tsunami probability. an in depth seismological learn of earthquakes within the Cretan arc during the last 50 years finds different vital positive aspects of its behaviour that have been formerly unknown. eventually, she offers primary insights into the constraints of radiocarbon relationship marine organisms, on the subject of how they secrete carbon into their skeletons. The thesis led to 3 significant papers in best journals.

Show description

Read Online or Download Active tectonics of the Hellenic subduction zone PDF

Best nonfiction_1 books

Densification of Metal Powders During Sintering

Sintering of powder steel compacts is among the uncomplicated oper­ ations in powder metallurgy. The worthy houses of a computer half are received after significant densification of the sintered fabric. even supposing the mechanical homes of the half depend upon different structural components in addition to porosity, porosity is the most issue.

Additional resources for Active tectonics of the Hellenic subduction zone

Sample text

2. The nodal planes are well-determined by the available P and SH station distribution, and the depth is well-constrained by the clear surface reflections in both P and SH waves. The left-lateral nodal plane strikes E-W, rather than NE-SW and parallel to the strike of the subduction zone at this point, as would be expected for a partitioned strike-slip component of oblique convergence. In addition, the depth of 56 ± 4 km suggests the event is in the downgoing African lithosphere, as I show later that the subduction interface itself is only seismogenic to about 40–45 km depth.

6, 15]). It is probable that the scarp of the Hellenic Trench is the surface expression of a steep (∼30◦ ) reverse fault splaying off the deeper underlying thrust-fault interface of the subduction zone (see Chap. 2). Where surface features are obscured or complicated, the obvious recourse is to look at earthquake focal mechanisms. g. [16–18]) show a bewildering variety of mechanisms associated with the subduction: normal, thrust and strike-slip fault-plane solutions with a range of orientations all apparently in nearly the same place.

38 3 Earthquakes in the Eastern Mediterranean [12] showed, small variations in the velocity structure used do not significantly affect the focal mechanism and are responsible for depth uncertainties of up to ±4 km. g. [18]). The earthquake mechanisms and depths I discuss in this chapter are ranked in quality by category. The best (in red) are those whose source parameters are independently determined by long-period body-wave modelling and with good P and SH waveform coverage. g. [48]). A better estimate of uncertainties is found by fixing some of the source parameters at values close to but different from those of the minimum misfit solution, and seeing whether the match of the observed to synthetic seismograms deteriorates [40, 48, 49].

Download PDF sample

Rated 4.97 of 5 – based on 22 votes