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RESEARCH

Here is a summary of the different research themes I explored during my PhD, from surface deformation due to hydrological loading and aquifer poroelasticity to fault slip and earthquakes induced by crustal water injections.

I'm incredibly thankful for my advisors, mentors and collaborators for all their help and support on these various projects:
Jean-Philippe Avouac (Caltech), Nadia Lapusta (Caltech), Kristel Chanard (Université de Paris, IPGP, IGN), Jean-Paul Ampuero (Géoazur), Luce Fleitout (ENS Paris), Frédéric Cappa (Géoazur), Donald Argus (JPL), Adriano Gualandi (INGV), Jérome Fortin (ENS Paris), Laurent Longuevergne (Univ Rennes), Manon Dalaison (ENS Paris), Romain Jolivet (ENS Paris), Paul Rebischung (Université de Paris, IPGP, IGN) and Sophie Violette (ENS Paris, Sorbonne University).

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SOLID EARTH DEFORMATION DUE TO
 HYDROLOGICAL LOADS 

 

Surface hydrological processes such as Monsoonal rains, droughts and glacial melting redistribute continental water mass and deform the solid Earth below. These fluctuations in hydrological loads and the resulting deformation can be measured with space-based geodetic techniques such as GRACE and GNSS.


Characterizing hydrology-induced signals in geodetic datasets is important to isolate deformation associated with tectonic processes, investigate the response of seismicity to environmental loads and provide new constraints on Earth’s rheology and water cycle.

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We developed a methodology to extract and relate hydrological signals from either dataset using Independent Component Analysis (ICA) and a global deformation model. We used this technique to extract 3D deformation fields due to seasonal and multiannual variations in hydrological loading in a variety of geographical settings, including the Nepal Himalayas, the Arabian Peninsula, California and Greenland.

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Relevant publication: Larochelle et al., JGR: Solid Earth (2018)

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