Global scale analysis and modelling of primary microseisms
| Autor: | Fabrice Ardhuin, Eléonore Stutzmann, Lucia Gualtieri, Carina Juretzek, Céline Hadziioannou |
|---|---|
| Přispěvatelé: | Institut de Physique du Globe de Paris (IPGP), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Université Paris Diderot - Paris 7 (UPD7)-IPG PARIS-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), ANR-14-CE01-0012,MIMOSA,Analyse, modélisation et utilisation du bruit sismique large bande: des microséismes aux oscillations libres de la terre(2014), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
Seismic noise
010504 meteorology & atmospheric sciences 010502 geochemistry & geophysics 01 natural sciences Computational seismology Geochemistry and Petrology Primary (astronomy) Numerical modeling Scale analysis (mathematics) 14. Life underwater Southern Hemisphere 0105 earth and related environmental sciences [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Microseism Spectral density Numerical models Theoretical Seis- mology Geophysics Numerical modelling Theoretical Seismology [SDU]Sciences of the Universe [physics] 13. Climate action Geology Seismology |
| Zdroj: | Geophysical Journal International Geophysical Journal International, Oxford University Press (OUP), 2019, pp.0-000. ⟨10.1093/gji/ggz161/5421624⟩ Geophysical Journal International, 2019, 218, pp.560-572. ⟨10.1093/gji/ggz161⟩ Geophysical Journal International, Oxford University Press (OUP), 2019, 218, pp.560-572. ⟨10.1093/gji/ggz161/5421624⟩ Geophysical Journal International (0956-540X) (Oxford University Press (OUP)), 2019-07, Vol. 218, N. 1, P. 560-572 Geophysical Journal International, 2019, 218, pp.560-572. ⟨10.1093/gji/ggz161/5421624⟩ |
| ISSN: | 1365-246X 0956-540X |
| DOI: | 10.1093/gji/ggz161 |
| Popis: | International audience; Primary microseism is the less studied seismic background vibration of the Earth. Evidence points to sources caused by ocean gravity waves coupling with the seafloor topography. As a result, these sources should be in water depth smaller than the wavelength of ocean waves. Using a state-of-the-art ocean wave model, we carry out the first global-scale seismic modeling of the vertical-component power spectral density of primary mi-croseisms. Our modeling allows us to infer that the observed weak seasonality of primary microseisms in the southern hemisphere corresponds to a weak local seasonality of the sources. Moreover, a systematic analysis of the source regions that mostly contribute to each station reveals that stations on both the East and West sides of the North Atlantic Ocean are sensitive to frequency-dependent source regions. At low frequency (i.e., 0.05 Hz), the dominant source regions can be located thousands of kilometers away from the stations. This observation suggests that identifying the source regions of primary micro-seisms as the closest coasts can be misleading. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|