Geophysics, Geodynamics and Tectonics.
My research focuses on the structure and mechanical behavior of the Earth's crust and upper mantle. This work uses seismology to construct images of the internal structure of the Earth which can then be used to test hypotheses of the Earth's evolution and dynamics. Although my research has depended heavily on publicly-available seismic data, much of my work is based on seismic data collected in my own field experiments in Iceland, New Zealand, Hawaii, Greece, Turkey, Chile and much of the Middle East and central Asia. I combine my seismic results with advances in geochemistry, petrology, and mineral physics to relate the measured seismic wave speeds to temperature and composition. This has allowed me to produce the first thickness maps of the lithosphere, the cold boundary layer near the Earth's surface which controls the Earth's heat loss and the tectonics of the oceans and continents. These lithospheric maps show how extensive regions of thick lithosphere have controlled the geometry of continental deformation; they have also provided significant new insights on the formation and evolution of the continents.
Current research projects:
Inversion of large seismic data sets for the examination of the structure of the Earth's upper mantle,
The relationship between upper shear-wavespeed, temperature and rheology of the upper mantle,
Structure of the lithosphere and its influence on the evolution of the continents,
Earth structure, earthquakes and large-scale physical process of the Arabian-Eurasian and Indo-Eurasian continental collision zones.
Geophysics ; Seismology
Recent publications can be found in the publications database here