This thesis is remarkable for the wide range of the techniques and
observations used and for its insights, which cross several disciplines.
It begins by solving a famous puzzle of the ancient world, which is what
was responsible for the tsunami that destroyed settlements in the
eastern Mediterranean in 365 AD. By radiocarbon dating of preserved
marine organisms, Shaw demonstrates that the whole of western Crete was
lifted out of the sea by up to 10 meters in a massive earthquake at that
time, which occured on a previously unknown fault. The author shows that
the resulting tsunami would have the characteristics described by
ancient writers, and uses modern GPS measurements and coastline
geomorphology to show that the strain build-up near Crete requires such
a tsunami-earthquake about every 6.000 years - a major insight into
Mediterranean tsunami hazard. A detailed seismological study of
earthquakes in the Cretan arc over the last 50 years reveals other
important features of its behaviour that were previously unknown.
Finally, she provides fundamental insights into the limitations of
radiocarbon dating marine organisms, relating to how they secrete carbon
into their skeletons. The thesis resulted in three major papers in top
journals.