Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Acta Geophysica

1 2020

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Seismic attribute analysis of Chicxulub impact crater

Salguero-Hernández E., Pérez-Cruz L., Urrutia-Fucugauch i J.

Acta Geophysica

2020

Vol. 68, no. 3

627--640

Chicxulub crater formed~66 Ma ago by an asteroid impact on the Yucatan platform in the southern Gulf of Mexico. The crater has a ~ 200 km rim diameter and has been covered by carbonate sediments up to ~ 1.1 km thick in the central zone. Previous studies have identifed the structure and major crater units through geophysical models from seismic refection and potential feld data, classifed as the central uplift, terrace zone, outer and inner ring fault zones and impactite deposits. Impact produced a deep excavation cavity, with fragmentation and ejection of large volumes of crustal target rocks. Understanding the pre-existing structures, impact-induced deformation and post-impact processes requires high-resolution images of the crater and target zone. For this study, we use complex trace attributes of instantaneous phase, frequency, envelope amplitude and similarity, in an E-W seismic refection profle crossing the crater in the marine sector. Geophysical logs and borehole lithological columns from the on-land drilling projects are used to constrain the petrophysical analysis. Seismic attributes aid to characterize the radial fault zones and physical property contrasts, revealing asymmetries in the crater structure. The refector packages in the post-impact sediments and target Cretaceous sequence are identifed in the frequency and phase attributes. The bottom crater refectors, with the basal sediments flling the crater foor topography, are enhanced with the envelope amplitude attribute. A set of high-amplitude refectors is shown in the similarity attribute, in which the refector geometry is delineated on the target carbonate sequence. The ofsets in the high-amplitude refectors between the eastern and western sectors are possibly associated to target pre-impact asymmetries, impact deformation and efects of central crater collapse.