Broad-band ambient noise characterization by joint use of cross-correlation and MUSIC algorithm
| Autor: | Hervé Chauris, Alexandre Kazantsev, Keurfon Luu, F. Huguet, M. Peruzzetto, J-P Métaxian |
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| Přispěvatelé: | Storengy France, Centre de Géosciences (GEOSCIENCES), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de Recherche pour le Développement (IRD), MINES ParisTech - École nationale supérieure des mines de Paris-PSL Research University (PSL), Storengy France [Bois-Colombes], Gaz de France Suez (GDF Suez), 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), Fondation MINES ParisTech, 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), Mines Paris - PSL (École nationale supérieure des mines de Paris) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Seismic noise Wave propagation Acoustics Ambient noise level [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Seismic interferometry 010502 geochemistry & geophysics 01 natural sciences Geochemistry and Petrology Guided waves Multiple signal classification 14. Life underwater Joint (geology) ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Cross-correlation Characterization (materials science) Geophysics [SDU]Sciences of the Universe [physics] Numerical modelling Surface waves and free oscillations Geology |
| Zdroj: | Geophysical Journal International Geophysical Journal International, Oxford University Press (OUP), 2018, 215 (2), pp.760-779. ⟨10.1093/gji/ggy311⟩ Geophysical Journal International, 2018, 215 (2), pp.760-779. ⟨10.1093/gji/ggy311⟩ |
| ISSN: | 0956-540X 1365-246X |
| DOI: | 10.1093/gji/ggy311⟩ |
| Popis: | International audience; Several days of passive seismic broad-band recordings (vertical component) from a dense 3 × 6 km array installed near Chémery (France), with about 100 seismometers, are analysed for wavefield characterization between 0.1 and 3 Hz. Backazimuth is determined by using the Multiple Signal Characterization (MUSIC) algorithm at frequencies below 1 Hz, and non-coherent cross-correlation beamforming above 1 Hz, since the latter is less sensitive to aliasing issues. A novel method of determining the wavefield velocity is introduced, consisting of processing a cross-correlation common-offset gather by the MUSIC algorithm. The fundamental and three higher modes of Rayleigh waves (R0, R1, R2 and R3) are identified under 1 Hz. Above 1.5 Hz, the Lg phase is detected, while R0 and R1 are also present. Roughly between 1 and 1.5 Hz, a quicker phase, probably Pg, is detected. Both Pg and Lg are dominant during night time, suggesting they have a natural origin, which is also consistent with their backazimuth pointing towards the Atlantic. Large scale 2-D spectral-element simulations using deep- and shallow-water ocean sources confirm the possibility of the Lg phase excitation. Thus, even above 1 Hz, natural sources can explain the major part of the ambient noise energy during quiet time periods. |
| Databáze: | OpenAIRE |
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