Imaging seismic wave-fields with AlpArray and neighboring European networks
Détails
Télécharger: Tesch2022.pdf (3619.16 [Ko])
Etat: Public
Version: de l'auteur⸱e
Licence: CC BY 4.0
Etat: Public
Version: de l'auteur⸱e
Licence: CC BY 4.0
ID Serval
serval:BIB_04648A24A7EF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Imaging seismic wave-fields with AlpArray and neighboring European networks
Périodique
International Journal of Earth Sciences
Statut éditorial
Publié
Date de publication
2022
Peer-reviewed
Oui
Volume
111
Pages
321-334
Langue
anglais
Résumé
The AlpArray experiment and the deployment of Swath-D together with the dense permanent network in Italy allow for detailed imaging of the spatio-temporal imaging complexity of seismic wave-fields within the greater Alpine region. The distance of any point within the area to the nearest station is less than 30 km, resulting in an average inter-station distance of about 45 km. With a much denser deployment in a smaller region of the Alps (320 km in length and 140 km wide), the Swath-D network possesses an average inter-station distance of about 15 km. We show that seismogram sections with a spatial sampling of less than 5 km can be obtained using recordings of these regional arrays for just a single event. Multiply reflected body waves can be observed for up to 2 h after source time. In addition, we provide and describe animations of long-period seismic wave-fields using recordings of about 1300–1600 broadband stations for six representative earthquakes. These illustrate the considerable spatio-temporal variability of the wave-field’s properties at a high lateral resolution. Within denser station distributions like those provided by Swath-D, even shorter period body and surface wave features can be recovered. The decrease of the horizontal wavelength from P to S to surface waves, deviations from spherically symmetric wavefronts, and the capability to detect multi-orbit arrivals are demonstrated qualitatively by the presented wave-field animations, which are a valuable tool for educational, quality control, and research purposes. We note that the information content of the acquired datasets can only be adequately explored by application of appropriate quantitative methods accounting for the considerable complexity of the seismic wave-fields as revealed by the now available station configuration.
Open Access
Oui
Création de la notice
21/09/2023 16:47
Dernière modification de la notice
22/09/2023 6:08