Using high-resolution, triplicate body waveforms, I investigate strong lateral variations in P- and SH-wave speeds (VP and VS) beneath the Tonga subduction zone where cold lithosphere is subducting rapidly at 200 mn/yr. ...

For the continental collision zone, I show that due to high VP near the bottom of the mantle transition zone, the contrast in VP across the 660-km discontinuity beneath central Tibet is small (around 3.1%): only about 70% ...

In the second part of this study, I developed the chromium stable isotope system as a biogeochemical indicator and monitoring tool. After initial work designing the techniques, I measured chromium stable isotope fractionation ...

Sequence stratigraphy is a useful tool for reducing cost of exploiting Aux Vases Sandstone resources. Sequence stratigraphy can be used in delineating areas best for hydrocarbons and water recovery, highlighting potential ...