My research centers on fundamental problems in Solid Earth Geophysics. I use a variety of theoretical techniques to model the dynamic evolution of the Earth's mantle, particularly focused on the role melting plays in mantle differentiation. I am currently investigating feedbacks between volatile-induced mantle circulation, volatile-induced melting, and thermally driven mantle convection. I also use teleseismic receiver functions to investigate the structure of the upper mantle and compare observations to theoretical models.

• Coupled Stokes' flows induced by chemical reactions and gravitational settling.
• Melt production and recycling above the mantle transition zone.
• Structure and evolution of the oceanic crust.
• Fine-scale structure of the mantle transition zone discontinuities.
• Convection with inhomogeneous internal heating.

1. Leahy, G.M., and J. Park, Evidence for a partially molten region above the 410 km mantle discontinuity in the Pacific, In preparation, May 2007 (pdf).
2. Leahy, G.M., and D. Bercovici, On the dynamics of a hydrous melt layer above the transition zone, J. Geophys. Res., 112, B07401, doi:10.1029/2006JB004631, 2007 (pdf).
3. Karato, S., D. Bercovici, G.M. Leahy, G. Richard, and Z. Jing, Transition zone water-filter model for global material circulation: Where do we stand?, Earth's Deep Water Cycle, AGU Monograph Series, 168, edited by S.D. Jacobsen and S. van der Lee, 2006.
4. Leahy, G.M. and J. Park, Hunting for oceanic island Moho, Geophys. Jour. Int., 160, 1020-1026, doi: 10.1111/j.1365-246X.2005.02562.x, 2005 (pdf).
5. Leahy, G.M., and D. Bercovici, The influence of the transition zone water filter on convective circulation in the mantle, Geophys. Res. Lett., 31, L23605, doi:10.1029/2004GL021206, 2004 (pdf).
6. Ritzwoller, M.H., N.M. Shapiro, and G.M. Leahy, The Australian-Antarctic Mantle Anomaly as the principal cause of the Australian-Antarctic Discordance, J. Geophys. Res., 108, B12, 2559, doi:10.1029/2003JB002522, 2003 (pdf).
7. Ritzwoller, M.H., N. Shapiro, A. Levshin, and G.M. Leahy, Crustal and upper mantle structure beneath Antarctica and surrounding oceans, J. Geophys. Res., 106, 30645-30670, 2001 (pdf).

1. Leahy, G.M., and D. Bercovici, On the production and entrainment of hydrous silicate melts above the transition zone, EOS, Trans. Amer. Geophys. Un., 87 (52), Fall Meet. Suppl. Abstract V53F-07, 2006.
2. Leahy, G.M., Melting at 410 km, CIDER Workshop UCSB, July 2006.
3. Leahy, G.M., and D. Bercovici, Structure and dynamics of a hydrous melt layer above the transition zone, EOS, Trans. Amer. Geophys. Un., 86 (52) Fall Meet. Suppl. Abstract DI41A-1261, 2005.
4. Leahy, G.M., and D. Bercovici, Structure and dynamics of a hydrous melt layer above the transition zone, 9th European Conference on Numerical Modeling of Mantle Convection and Lithospheric Dynamics, September 2005.
5. Leahy, G.M., and D. Bercovici, 2D Simulations of convection with heat production decoupled from bulk flow, SEDI conference, S7.5, July 2004.
6. Leahy, G.M., and J. Park, Receiver Functions at Rarotonga, Cook Islands, IRIS Annual Report, 2003.
7. Leahy, G.M., and J. Park, Hunting for oceanic Moho: The snipe bites back, EOS, Trans. Amer. Geophys. Un., 84 (49), Fall Meet. Suppl. Abstract T41C-0225, 2003.
8. Ritzwoller, M.H., N.M. Shapiro, S. Zhong, W. Landuyt, and G.M. Leahy, Lithospheric thickness and sea floor topography inferred from a global seismic model, EOS, Trans. Amer. Geophys. Un., 82 (47), Fall meeting, 2001.