دورية أكاديمية
Quantifying microseismic noise generation from coastal reflection of gravity waves recorded by seafloor DAS
| العنوان: | Quantifying microseismic noise generation from coastal reflection of gravity waves recorded by seafloor DAS |
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| المؤلفون: | Guerin, Gauthier, Rivet, Diane, van den Ende, Martijn P.A., Stutzmann, E., Sladen, Anthony, Ampuero, Jean Paul |
| المساهمون: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), ANR-19-P3IA-0002,3IA@cote d'azur,3IA Côte d'Azur(2019), ANR-19-CE04-0011,MONIDAS,Utilisation des capteurs acoustiques distribués (DAS) pour la surveillance des risques naturels(2019), ANR-21-CE01-0031,BRUIT-FM,Comprehension, prevention et utilisation du bruit sismologique en fond de mer(2021) |
| المصدر: | ISSN: 0956-540X. |
| بيانات النشر: | HAL CCSD Oxford University Press (OUP) |
| سنة النشر: | 2022 |
| المجموعة: | HAL Université Côte d'Azur |
| مصطلحات موضوعية: | Epos-France, Seismic noise, Wave propagation, Interface waves, [SDU]Sciences of the Universe [physics], [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
| الوصف: | International audience ; Secondary microseisms are the most energetic noise in continuous seismometer recordings. They are generated by interactions between ocean waves, including between gravity waves incident on and reflected from the coast. Coastal reflections of ocean waves leading to coastal microseismic sources are hard to estimate in various global numerical wave models, and independent quantification of these coastal sources through direct measurements can greatly improve these models. Here, we exploit a 41 km long submarine optical fiber cable located offshore Toulon, France, using Distributed Acoustic Sensing (DAS). We record both the amplitude and frequency of seafloor strains induced by ocean surface gravity waves, as well as secondary microseisms caused by the interaction of gravity waves incident and reflected from the coast. By leveraging the spatially distributed nature of DAS measurements, additional fundamental information is recovered such as the velocity and azimuth of the waves. We find that on average 30 per cent of the gravity waves are reflected at the coast generating local sources of secondary microseisms that manifest as Scholte waves. These local sources represent the most energetic contribution to the seismic noise recorded along the optical fiber and by an onshore broadband station located near the DAS interrogator. Furthermore, we estimate a coastal reflection coefficient of ocean surface gravity waves R 2 of about 0.07, which provides improved constraints for seismic noise generation models. In addition, we show that new local sources of microseisms can be generated when gravity waves characteristics (azimuth and frequency content) change and lead to some delays between the optical fiber (OF) cable and buoy recordings. These analyses pave the way for a wide use of DAS data to monitor ocean-solid earth interactions as they provide a wealth of information on the reflection of gravity waves, coastal microseismic sources, and new constraints for numerical models of microseismic noise. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | insu-03748535; https://insu.hal.science/insu-03748535Test; https://insu.hal.science/insu-03748535/documentTest; https://insu.hal.science/insu-03748535/file/ggac200.pdfTest; BIBCODE: 2022GeoJI.tmp.206G; IRD: fdi:010085323 |
| DOI: | 10.1093/gji/ggac200 |
| الإتاحة: | https://doi.org/10.1093/gji/ggac200Test https://insu.hal.science/insu-03748535Test https://insu.hal.science/insu-03748535/documentTest https://insu.hal.science/insu-03748535/file/ggac200.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.216BCFED |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/gji/ggac200 |
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