Présidents de session
Methodologies and numerical approaches to inversion problems
- Stephanie Durand (CNRS - LGLTPE)
Understanding the Earth’s interior properties is vital for various research branches like geodynamics and plate tectonics and helps crucial estimations for seismic risk assessments and shake maps. Full seismic waveform inversion has emerged as a promising methodology to recover improved tomographic images of the mantle and crust. As the workflow solves the wave equation through numerical...
Muon imaging has recently emerged as a powerful method to complement standard geophysical tools in the understanding of the Earth’s subsurface. Muon measurements yield a “radiography” of the average density along the muon path, allowing to image large volumes of a geological body from a single observation point. More traditional gravity field measurements are also sensitive to the near-surface...
Normal modes, or whole Earth oscillations, are the only seismic data that are able to constrain density in the Earth in addition to velocity. Thus, normal modes are key for comparing and combining with constraints on density from neutrino data.
Normal modes are studied by using large earthquakes and Fourier transforming week-long seismograms from the time domain to the frequency domain....
(REMOTE)
Neutrinos can be used to study the interiors of various objects that are difficult to fully probe by classical means. In the case of the Earth, they provide complementary information to seismic waves because of the imprint of matter effects on their oscillations. This alternative approach may bring new insights on open questions regarding the composition, structure, and dynamics...
