Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

 
 
DownloadE-Mail
  Heterogeneous seismic anisotropy beneath Madeira and Canary archipelagos revealed by local and teleseismic shear wave splitting

Schlaphorst, D., Silveira, G., Mata, J., Krüger, F., Dahm, T., Ferreira, A. M. G. (2023): Heterogeneous seismic anisotropy beneath Madeira and Canary archipelagos revealed by local and teleseismic shear wave splitting. - Geophysical Journal International, 233, 1, 510-528.
https://doi.org/10.1093/gji/ggac472

Item is

Dateien

einblenden: Dateien
ausblenden: Dateien
:
5014601.pdf (Verlagsversion), 5MB
Name:
5014601.pdf
Beschreibung:
-
Sichtbarkeit:
Öffentlich
MIME-Typ / Prüfsumme:
application/pdf / [MD5]
Technische Metadaten:
Copyright Datum:
-
Copyright Info:
-

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Schlaphorst, David1, Autor
Silveira, Graça1, Autor
Mata, João1, Autor
Krüger, Frank1, Autor
Dahm, T.2, Autor              
Ferreira, Ana M G1, Autor
Affiliations:
1External Organizations, ou_persistent22              
22.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146029              

Inhalt

einblenden:
ausblenden:
Schlagwörter: Seismic Anisotropy, Hotspots, Composition and structure of the mantle, Composition and structure of oceanic crust, Dynamics: convection currents, and mantle plumes
 Zusammenfassung: Mid-plate upward mantle flow is a key component of global mantle convection, but its patterns are poorly constrained. Seismic anisotropy is the most direct way to infer mantle flow as well as melt distribution, yet the convection patterns associated with plume-like mantle upwelling are understudied due to limited seismic data coverage. Here, we investigate seismic anisotropy beneath the Madeira and Canary hotspots using a dense set of shear wave splitting observations and combining teleseismic and local events recorded by three-component broadband and short-period seismic stations. Using a total of 26 stations in the Madeira archipelago and 43 stations around the Canary Islands, we obtain 655 high quality measurements that reveal heterogeneous flow patterns. Although local event results are sparse around most islands, we can observe a small average of S-wave splitting times of 0.16 ± 0.01 s, which significantly increase with source depth beneath El Hierro (>20 km) and Tenerife (>38 km) up to 0.58 ± 0.01 s and 0.47 ± 0.05 s. This suggests an influence of melt pocket orientation in magma reservoirs developed at uppermost-mantle depths. Likewise, anisotropy increases significantly beneath the islands with shield stage volcanism (up to 9.81 ± 1.78% at El Hierro, western Canaries, against values up to 1.76 ± 0.73% at Lanzarote, eastern Canaries). On average, teleseismic SKS-wave splitting delay times are large (2.19 ± 0.05 s), indicating sublithospheric mantle flow as the primary source for anisotropy in the region. In the Canaries the western islands show significantly smaller average SKS delay times (1.93 ± 0.07 s) than the eastern ones (2.25 ± 0.11 s), which could be explained by destructive interference above the mantle upwelling. Despite complex patterns of fast polarisation directions throughout both regions, some azimuthal pattern across close stations can be observed and related to present-day mantle flow and anisotropy frozen in the lithosphere since before 60 Ma. Additionally, we infer that the current presence of a mantle plume beneath the archipelagos leads to the associated complex, small-scale heterogeneous anisotropy observations.

Details

einblenden:
ausblenden:
Sprache(n):
 Datum: 2022-11-302023
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1093/gji/ggac472
GFZPOF: p4 T3 Restless Earth
OATYPE: Hybrid Open Access
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Geophysical Journal International
Genre der Quelle: Zeitschrift, SCI, Scopus, ab 2024 OA-Gold
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 233 (1) Artikelnummer: - Start- / Endseite: 510 - 528 Identifikator: ISSN: 0956-540X
ISSN: 1365-246X
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals180
Publisher: Oxford University Press