EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Imaging oceanic basins with wave equation and radiative transfer models

Chiara Nardoni1, Luca De Siena2, Fabio Cammarano3, Fabrizio Magrini2, and Elisabetta Mattei1
Chiara Nardoni et al.
  • 1Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, Rome, Italy (
  • 2Institute of Geosciences, Geophysics and Geodynamics, Johannes Gutenberg University, Mainz, Germany
  • 3Dipartimento di Scienze, Università degli Studi Roma Tre, Rome, Italy

When seismic information is used to map Earth structures, a primary challenge is modelling the response of seismic wavefields to strong lateral variations in medium properties. These variations are especially relevant across oceanic basins with mixed continental-oceanic crust and including magmatic systems. These highly-scattering and absorption media produce stochastic signatures that are hard to separate from complex coherent reverberations due to shallow Moho. The discrimination between these two effects is fundamental for improving full-waveform techniques when imaging oceanic basins at regional and global scales. Here, we present a joint tomographic and modelling approach focusing on the ~1 Hz frequency band, where seismic scattering and attenuation mechanisms are predominantly resonant. Firstly, we image late-time coda attenuation as a marker of seismic absorption across the Italian peninsula and the Tyrrhenian Sea. Regional-scale data provide the ideal benchmark to explore the potential of attenuation imaging using radiative-transfer-derived sensitivity kernels in a mixed continental-oceanic crust. Then, we explore the response of seismic wavefield to structural variations combining coda-attenuation imaging with simulations based on radiative transfer and wave-equation modelling. The results provide evidence of intra-crustal reverberations and energy leakage in the mantle, finally being able to map Moho depths with regional earthquakes. This work is an ideal forward model of seismic wavefields recorded across the oceanic crust for future full-waveform inversions and imaging of crustal discontinuities.

How to cite: Nardoni, C., De Siena, L., Cammarano, F., Magrini, F., and Mattei, E.: Imaging oceanic basins with wave equation and radiative transfer models, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1920,, 2022.

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