File:Conceptual model of the impact sequence at the Nadir impact site, based on seismic observations and analog models.webp

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Summary

Description
English: "(A) At time (t) = 0, the impactor hits the water surface at a velocity of ~20 km/s, initiating a rim-wave tsunami in its wake. (B) Several seconds later, the transient crater forms, as the impactor and a substantial body of water are vaporized. Impactites (melt rock and breccias) line the transient cavity. Tsunami waves propagate away from the evacuated crater. Shock waves cause substantial damage below and around the impact site, and seismic waves propagate across the plateau; (C) major uplift (~400 m relative to preimpact regional) occurs in the “rebound” crater modification phase, resulting in the formation of a raised crater peak; (D) radial collapse of the subsurface damage zone results in further modification of the crater, including the formation of terraces at the surface. Resurge of water transports substantial volume of ejecta and other sediment into the crater, deposited above the impactites."
Date
Source https://www.science.org/doi/10.1126/sciadv.abn3096
Author

Authors of the study: Uisdean Nicholson https://orcid.org/0000-0003-0746-8549 Veronica J. Bray https://orcid.org/0000-0002-7277-3980 Sean P. S. Gulick https://orcid.org/0000-0003-4740-9068 and

Benedict Aduomahor https://orcid.org/0000-0002-6927-5892

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Captions

From the study "The Nadir Crater offshore West Africa: A candidate Cretaceous-Paleogene impact structure"

Items portrayed in this file

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17 August 2022

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6686c746315c0c8aff4b160a45d2a412e3ff2a04

471,674 byte

1,969 pixel

3,000 pixel

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current05:05, 22 September 2022Thumbnail for version as of 05:05, 22 September 20223,000 × 1,969 (461 KB)imagescommonswiki>PrototyperspectiveUploaded a work by Authors of the study: Uisdean Nicholson https://orcid.org/0000-0003-0746-8549 Veronica J. Bray https://orcid.org/0000-0002-7277-3980 Sean P. S. Gulick https://orcid.org/0000-0003-4740-9068 and Benedict Aduomahor https://orcid.org/0000-0002-6927-5892 from https://www.science.org/doi/10.1126/sciadv.abn3096 with UploadWizard