Quantifying P-wave secondary microseisms events: a comparison of observed and modelled backprojection
| العنوان: | Quantifying P-wave secondary microseisms events: a comparison of observed and modelled backprojection |
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| المؤلفون: | R Zhang, P Boué, M Campillo, J Ma |
| المساهمون: | Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Harbin Institute of Technology (HIT), Peking University [Beijing], ANR-20-CE49-0003,TerraCorr,Corrélation du Bruit Microsismique et de la Coda des Grands Séismes pour l'Imagerie de la Terre Profonde(2020), European Project: No. 742335,ERC F-IMAGE |
| المصدر: | Geophysical Journal International Geophysical Journal International, 2023, 234 (2), pp.933-947. ⟨10.1093/gji/ggad103⟩ |
| بيانات النشر: | Oxford University Press (OUP), 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | Body waves, Wave propagation, Geophysics, Seismic noise, Numerical modelling, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Geochemistry and Petrology |
| الوصف: | SUMMARY Secondary microseisms are caused by nonlinear interactions between ocean waves of approximately equal wavelengths and opposite propagation directions. This seismic forcing is evaluated using ocean sea-state hindcast data and further modulated by the bathymetric effect. The numerical ocean model provides a global activity representation of the secondary microseisms, from which we isolate major events. We backprojected teleseismic P-wave propagation into the Earth's mantle to validate these events as effective seismic sources. The ocean model provides spectral amplitude information for modelling microseisms generated seismic wavefield. A comparison of the backprojection for P and PP phases from observed and synthetic microseisms forcing indicates high reliability in the ocean model, at least for major sources. A combination of P and PP phases detected across a global network of stations enables global ocean coverage. We improve backprojection images even further by introducing a two-step stacking for the P phase to address the problem of unbalanced station distribution. Thresholds of microseisms events forces valuable for seismic imaging are determined by comparing backprojections and ocean models for the years 2015 and 2020. Finally, we extracted a catalogue of microseisms events every 3-hr from 1994 to 2020 from the ocean hindcast data set. This catalogue is an intriguing resource for future applications of interferometric imaging at large scale. |
| تدمد: | 1365-246X 0956-540X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::267730072697fc8cab67281e89ad54b7Test https://doi.org/10.1093/gji/ggad103Test |
| حقوق: | EMBARGO |
| رقم الانضمام: | edsair.doi.dedup.....267730072697fc8cab67281e89ad54b7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1365246X 0956540X |
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