Louis Moresi

DPhil (Oxford); BA(hons) (Cambridge)
Professor

I am a professor of geophysics / geodynamics and I am interested in understanding the evolution of the deep Earth over geological time, how this evolution is recorded in the superficial geological record,and how to build computation modelling tools to simulate the Earth. The tools of my trade are computational programs and numerical algorithms.

I am a strong supporter of open source code so my publications will also find links to repositories where the source code is available with examples of how to reproduce peer-reviewed benchmarks and published results. Since I am also a believer in literate programming [1], recent examples are in the form of ipython / jupyter notebooks.

For more information about me, my work and some blog posts see http://www.moresi.info

[1] Knuth, Donald E. (1984). "Literate Programming". The Computer Journal (British Computer Society) 27 (2): 97-111. doi:10.1093/comjnl/27.2.97.


Research interests

I am trying to understand the thermal-mechanical evolution of the Earth through geological time. This includes the fundamental question of how convective heat loss from the deep Earth is expressed mechanically as plate tectonics, the role of continents in the modulating this expression, the interaction between processes on this planetary scale with instabilities at the lithospheric scale — whether rheological or mechanical in nature, the influence of atmospheric feedbacks on the solid earth, and the signatures of all these processes that we can expect to find through geophysical observation of the present day Earth, and in the long-term geological record.

Much of the complexity in the surface expression of mantle flow can be attributed to the non-linear nature of the constitutive laws. The Earth, on geological timescales, behaves as a non-linear viscoelastic fluid with a finite strength due to small-scale processes such as faulting and ductile shear localization which can be treated through the theory of plasticity. The underlying processes which we treat in this manner introduce complexity in that they introduce a significant dependence on the stress, strain, and thermal histories of the fluid representation. Plasticity is typically a phenomenological description of the material response to stresses and is cast in terms of the stress state of the material (from which the motions follow); in the Earth, stresses are less well known than the kinematics and much is likely to be learned from plasticity models which are founded on the kinematics of surface motions.

Groups

  • Kiraly, A, Portner, D, Haynie, K et al. 2020, 'The effect of slab gaps on subduction dynamics and mantle upwelling', Tectonophysics, vol. 785, pp. -.
  • Yang, H, Moresi, L & Quigley, M 2020, 'Fault spacing in continental strike-slip shear zones', Earth and Planetary Science Letters, vol. 530.
  • Lecocq, T, Hicks, S, Koen, V et al. 2020, 'Global Quieting of High-Frequency Seismic Noise Due to COVID-19 Pandemic Lockdown Measures', Science, vol. 369, pp. 1338-1343.
  • Sandiford, D, Moresi, L, Sandiford, M et al. 2020, 'The Fingerprints of Flexure in Slab Seismicity', Tectonics, vol. 39, no. 8.
  • Mulhaus, H & Moresi, L 2019, 'A Model for Trap Door Flow from a Deep Container', in Wei Wu (ed.), Desiderata Geotechnica, Springer International Publishing, Switzerland, pp. 113-118.
  • Mather, B, Moresi, L & Rayner, P 2019, 'Adjoint inversion of the thermal structure of Southeastern Australia', Geophysical Journal International, vol. 219, no. 3, pp. 1648-1659.
  • Carluccio, R, Kaus, B, Capitanio, F et al. 2019, 'The Impact of a Very Weak and Thin Upper Asthenosphere on Subduction Motions', Geophysical Research Letters, vol. 46, no. 21, pp. 11893-11905.
  • Yang, T, Moresi, L, Gurnis, M et al. 2019, 'Contrasted East Asia and South America Tectonics Driven by Deep Mantle Flow', Earth and Planetary Science Letters, vol. 517, pp. 106-116.
  • Sandiford, D, Moresi, L, Sandiford, M et al. 2019, 'Geometric controls on flat slab seismicity', Earth and Planetary Science Letters, vol. 527, no. 0.
  • Moron, S, Cawood, P, Haines, P et al. 2019, 'Long-Lived Transcontinental Sediment Transport Pathways of East Gondwana', Geology, vol. 47, no. 6, pp. 513-16.
  • Sandiford, D & Moresi, L 2019, 'Improving Subduction Interface Implementation in Dynamic Numerical Models', Solid Earth, vol. 10, no. 3, pp. 969-85.