Modal propagation of ocean acoustic waves generated by earthquakes
| hal.structure.identifier | Laboratoire Géosciences Océan [LGO] | |
| dc.contributor.author | LECOULANT, Jean | |
| hal.structure.identifier | Laboratoire Géosciences Océan [LGO] | |
| dc.contributor.author | GUENNOU, Claude | |
| hal.structure.identifier | Institut de Recherche de l'Ecole Navale [IRENAV] | |
| dc.contributor.author | GUILLON, Laurent | |
| hal.structure.identifier | Laboratoire Géosciences Océan [LGO] | |
| dc.contributor.author | ROYER, Jean-Yves | |
| dc.date.accessioned | 2021-05-14T09:37:48Z | |
| dc.date.available | 2021-05-14T09:37:48Z | |
| dc.date.issued | 2019-10-14 | |
| dc.date.conference | 2019-06 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/76376 | |
| dc.description.abstractEn | The generation of low-frequency (≤ 40 Hz) acoustic waves (T-waves) by undersea earthquakes below a flat abyssal plain is not yet fully understood. To model the generation and propagation of PN-waves (horizontally in the crust and vertically in the ocean) and of T-waves over a rough sea bottom, we use a 2D spectral finite-element code (SPECFEM2D). The model includes a solid layer (Earth crust) overlain by a fluid ocean, and separated by a sinusoidal crust/water interface (seafloor roughness). Synthetic T-waves propagate as Rayleigh modes with their expected vertical and long-range horizontal propagation. In the simulated PN-wave spectrum, resonance peaks appear at frequencies predicted by the analytical solution for Rayleigh modes. The same peaks are observed in actual T-wave records from an antenna of two hydrophones at different, generated by a large magnitude earthquake 987 km away. The T-waves spectrum from the shallowest hydrophone shows an energy gap in the 1-4 Hz frequency range that can be explained by modal propagation. The resonance peaks in the observed PN-wave spectrum are also well predicted by the analytical solution. | |
| dc.language.iso | en | |
| dc.source.title | OCEANS 2019 - Marseille | |
| dc.subject.en | Abyssal T-waves | |
| dc.subject.en | PN-waves | |
| dc.subject.en | SN-waves | |
| dc.subject.en | Rayleigh modes | |
| dc.subject.en | spectral element modeling | |
| dc.title.en | Modal propagation of ocean acoustic waves generated by earthquakes | |
| dc.type | Communication dans un congrès avec actes | |
| dc.identifier.doi | 10.1109/OCEANSE.2019.8867377 | |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph] | |
| bordeaux.hal.laboratories | Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295 | * |
| bordeaux.institution | Université de Bordeaux | |
| bordeaux.institution | Bordeaux INP | |
| bordeaux.institution | CNRS | |
| bordeaux.institution | INRAE | |
| bordeaux.institution | Arts et Métiers | |
| bordeaux.country | FR | |
| bordeaux.title.proceeding | OCEANS 2019 MTS/IEEE | |
| bordeaux.conference.city | Marseille | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02398788 | |
| hal.version | 1 | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02398788v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=OCEANS%202019%20-%20Marseille&rft.date=2019-10-14&rft.au=LECOULANT,%20Jean&GUENNOU,%20Claude&GUILLON,%20Laurent&ROYER,%20Jean-Yves&rft.genre=proceeding |
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