Marion Thomas

Marion Thomas

Visiting Fellow
Tel: +44 (0) 1865 72052

I study earthquakes and active faults by combining remote sensing techniques, structural geology and mechanical modeling. The goal of my research is to undertsand the spatial and temporal variability of fault zones behavior (seismic/aseismic) and how does that impact the spatial extent, size and timing of earthquake ruptures.

In particular, I focus my research on measuring the time evolution of surface deformation using geodetic techniques. The goal is to determine the spatialtemporal variations of fault slip to reveal fault patches which remain locked, accumulating stress to be released in future earthquakes and patches which undergo aseismic creep.  I then compare the fault properties infered from kinematic studies with those determined from structural analysis of fault zones. The third part of my work is to relate theses geogical and geodetic observations to mechanical models of the seismic cycle. In particular I investigate the interplay between earthquake ruptures dynamic and off-fault damage and how does the temporal evolution of fault and bulk properties impact the seismic behavior of fault.


M. Y. Thomas, J.-P. Avouac, N. Lapusta. Dynamic modeling of earthquakes sequences on the Longitudinal Valley Fault: implications for friction properties, to be submitted to JGR

M. Y. Thomas, H. S. Bhat, and Y. Klinger, Effect of Damage on Earthquake Rupture Dynamic, under revisions, AGU monograph on “Fault Zone Dynamic Processes: Evolution of Fault Properties During Seismic Rupture”.


M. Y. Thomas, J.-P. Avouac, J.-P. Gratier, and J.-C. Lee, 2014. Lithological control on the deformation mechanism and the mode of fault slip on the Longitudinal Valley Fault, Taiwan, Tectonophysics, v. 632, p. 48–63.

M. Y. Thomas, J.-P. Avouac, J. Champenois, J.-C. Lee,  and L.-C. Kuo, 2014. Spatiotemporal evolution of seismic and aseismic slip on the Longitudinal Valley Fault, Taiwan, Journal of Geophysical Research-solid Earth, v. 119, p. 5114–5139.

M. Y Thomas, N. Lapusta, H. Noda, H. and  J.-P. Avouac, 2014. Quasi-dynamic versus fully-dynamic simulations of earthquakes and aseismic slip with and without enhanced coseismic weakening, Journal of Geophysical Research-solid Earth, v. 119, p. 1986-2004



T. Ader, J.-P. Avouac, J. Liu-Zeng, H. Lyon-Caen, L. Bollinger, J. Galetzka, J. Genrich, M. Thomas, K. Chanard, S. N. Sapkota, P. L. Shrestha, S. Rajaure, D. Lin, and M. Flouzat, 2012. Convergence rate across the Nepal Himalaya and interseismic coupling on the Main Himalayan Thrust, implications for seismic hazard, Journal of Geophysical Research-Solid Earth, v 117, p. B04403



C. Hamelin, L. Dosso, B. B. Hanan, M. Moreira, A. P. Kositsky, and M. Y. Thomas, 2011. Geochemical portray of the Pacific Ridge: New isotopic data and statistical techniques, Earth and Planetary Science Letters, v. 302, p. 154-162