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Dr. Gerald Galgana
I am a geophysicist (geodesist) and I study crustal deformation processes on terrestrial planets.

On Venus: My primary interests are volcano-tectonic processes associated with large volcanic edifices (such as Tepev, Sif, and Maat Montes), and radially fractured centers (such as Pavlova and Mokos). I study the mechanical effects of volcano edifice loading on the evolution of magma chambers, magma ascent and the propagation of igneous intrusions at the surface and at depth. Related to this research are investigations of the formation of radial and ring dikes, which are theorized to originate from stresses caused by magma reservoir processes and flexural uplift of the Venusian lithosphere. I use numerical and analytic methods to model the interactions of magma chambers and lithospheric stresses.

On Earth: I study active deformation of the lithosphere, comparing both interplate and intraplate settings. I analyze microplate motion, seismicity patterns, elastic strain accumulation along faults, intra- and inter-block deformation, and strain partitioning processes along active, convergent plate boundary zones. To accomplish this, I use numerical and analytic models constrained by plate velocities obtained from high-precision space geodetic (GPS) observations, earthquake focal mechanisms and other geophysical data. Similarly, within intraplate settings such as the Central United States, I study minute strain rates associated with active seismicity and deformation of the thick, relatively stable continental crust.

I also study volcano-tectonic processes on Earth using GPS to observe time-varying deformation of volcanic edifices. I use inversion techniques to locate and determine the geometries of magmatic sources and then use finite element analysis to study complex processes associated with active deformation of volcanic edifices.



Journal Articles

New constraints on volcano-tectonic evolution of large volcanic edifices on Venus from stereo topography–derived strain estimates
McGovern, P. J., Galgana, G. A., Verner, K. R., & Herrick, R. R.
Geology 42(1), 59-62, 2014
doi:doi: 10.1130/G34919.1


Geodetic observations and modeling of time-varying deformation at Taal Volcano, Philippines
Galgana, G. A., Newman, A. V., Hamburger, M. W., & Solidum, R. U.
Philippines. Journal of Volcanology and Geothermal Research 271, 11-23, 2014
doi:10.1016/j.jvolgeores.2013.11.005


Lithospheric flexure and volcano basal boundary conditions: keys to the structural evolution of large volcanic edifices on the terrestrial planets
McGovern, PJ; Grosfils, EB; Galgana, GA; Morgan, JK; Rumpf, ME; Smith, JR; Zimbelman, JR
Geological Society, London, Special Publications 401, , 2014
doi:doi: 10.1144/SP401.7


Radial dike formation on Venus: Insights from models of uplift, flexure and magmatism
Galgana, G. A., Grosfils, E. B., & McGovern, P. J.
Icarus 225, 538-547, 2013
doi:10.1016/j.icarus.2013.04.020


Elastic models of magma reservoir mechanics: a key tool for investigating planetary volcanism
Grosfils, E. B., McGovern, P. J., Gregg, P. M., Galgana, G. A., Hurwitz, D. M., Long, S. M., & Chestler, S. R.
Geological Society, London, Special Publications 401, SP401-2, 2013
doi:doi: 10.1144/SP401.2


Evolution of Large Venusian Volcanoes: Insights from Coupled Models of Lithosphere Flexure and Magma Reservoir Pressurization
Galgana, G., P. McGovern, and E. Grosfils
Journal of Geophysical Research – Planets 116, doi:10.1029/2010, 2011


Geodetic Observations of Active Crustal Deformation in the Wabash Valley Seismic Zone and the Southern Illinois Basin
Galgana, G. and M. Hamburger
Seismological Research Letters 81(5), 699-714, 2010


Analysis of Crustal Deformation of Luzon Island, Philippines using Geodetic Observations and Earthquake Focal Mechanisms
Galgana, G., M. Hamburger, R. McCaffrey, E. Corpuz and Q. Chen
Tectonophysics 432, 63-87, 2007


Visualizing Sea Level Rise in Navotas Using Terrain Modeiling and GIS
Galgana, G., S. Abad, M. Vicente and J. Villarin
Journal of Environmental Science and Management 7(1), 1-9, 2004




Dr. Gerald Galgana
[Personal Website]
joined June 30, 2011

9 journals, 3 societies