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| Titel |
Wide-angle seismic constraints on hyper-extended crust at the Deep Galicia Margin |
| VerfasserIn |
Tim Minshull, Richard Davy, Gaye Bayrakci, Joanna Morgan, Tim Reston, Dale Sawyer, Jon Bull, Dirk Klaeschen, Cord Papenberg |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145007
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| Publikation (Nr.) |
 EGU/EGU2017-8898.pdf |
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| Zusammenfassung |
| During the Galicia3D experiment in 2013, we acquired coincident normal-incidence and wide-angle seismic data covering a 64 by 20 km region of hyper-extended continental crust and exhumed mantle on the Deep Galicia Margin west of Spain. The hyper-extended crust is characterised by steeply dipping normal faults soling out onto the low-angle S detachment. Using three-dimensional first-arrival seismic tomography across this region and two-dimensional reflection-refraction tomography along a densely sampled region through this region, we have previously shown that uppermost mantle velocities are reduced where the normal faults intersect with the S detachment, interpreted as the result of hydration. Here we present further analysis of these data using two-dimensional time-domain full-waveform inversion (FWI) and three-dimensional reflection-refraction tomography. These techniques allow us to reduce ambiguities in interpretation of syn-rift sediment, pre-rift sediment and crystalline crust above S, and provide enhanced resolution of variations in hydration beneath S. |
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