Global observational seismology with special interest in deep Earth structure and dynamics.
The inner and the outer core, the lowermost mantle and the interaction between the core and mantle.
Lithospheric imaging using multiple geophysical data sets and developing new approaches.
Physics of seismic sources; source kinematics and modeling complex finite sources.
Deployment of geophysical instruments in remote areas of Earth including oceans; installation of geophysical instruments on other planets; planetary seismology.