Submarine landslides, tsunami and hydroacoustic waves: simulation and sensitivity analysis
- 1RWTH Aachen University, Eddy research training group, Aachen, Germany (dubois@eddy.rwth-aachen.de)
- 2M3DISIM - Mathematical and Mechanical Modeling with Data Interaction in Simulations for Medicine LMS - Laboratoire de mécanique des solides, Inria Saclay - Ile de France
- 3IPG Paris - Institut de Physique du Globe de Paris, Université Paris Cité
- 4ANGE - Numerical Analysis, Geophysics and Ecology Inria de Paris, LJLL (UMR_7598) - Laboratoire Jacques-Louis Lions
We simulate the generation of acoustic and tsunami waves generated by submarine landslides using the linear model developed in [1]. The model is able to reproduce both acoustic and surface gravity waves generated by a moving source (e.g. earthquake, landslide) in a vertically stratified ocean.
There are only a few studies that focus on the generation of acoustic waves by submarine landslides. In [2], the combined analysis of field data and simulations underline the presence of an interference pattern in the acoustic waves' spectrogram. The interference pattern has a time-varying bandwidth, which is a signature of the submarine landslide dynamics. In a previous work [3], we used the model developed in [1] to reproduce the interference pattern for a static source.
Here we use the same model to simulate a submarine landslide in the 2D case. The simulations reproduce the time-varying bandwidth. They are then used to study the influence of two parameters on the acoustic spectrograms, namely landslide velocity and topography. Different velocity profiles available in the literature [4] are tested. For the topography, we use as reference the 2D case simulated in [1]. We also provide illustrations for the tsunami generation by the landslide.
[1] Dubois J, Imperiale S, Mangeney A, Bouchut F, Sainte-Marie J. Acoustic and gravity waves in the ocean: a new derivation of a linear model from the compressible Euler equation. Journal of Fluid Mechanics. 2023;970:A28. doi:10.1017/jfm.2023.595
[2] Caplan-Auerbach, J., Dziak, R. P., Bohnenstiehl, D. R., Chadwick, W. W., and Lau, T.-K. (2014), Hydroacoustic investigation of submarine landslides at West Mata volcano, Lau Basin, Geophys. Res. Lett., 41, 5927– 5934, doi:10.1002/2014GL060964.
[3] Dubois, J., Imperiale, S., Mangeney, A., and Sainte-Marie, J.: Simulation of the hydro-acoustic and gravity waves generated by a landslide, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-15937, https://doi.org/10.5194/egusphere-egu23-15937, 2023.
[4] Farin, M., Mangeney, A., de Rosny, J., Toussaint, R., & Trinh, P.-T. (2019). Relations between the characteristics of granular column collapses and resultant high-frequency seismic signals. Journal of Geophysical Research: Earth Surface, 124, 2987–3021. https://doi.org/10.1029/2019JF005258
How to cite: Dubois, J., Imperiale, S., Mangeney, A., and Sainte-Marie, J.: Submarine landslides, tsunami and hydroacoustic waves: simulation and sensitivity analysis, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-11561, https://doi.org/10.5194/egusphere-egu24-11561, 2024.
