Contrasting seismic velocity and compaction of marine calcareous oozes and volcaniclastic deposits on the South Aegean Volcanic Arc

Manga, M., Wright, V., Cadena, T., McIntosh, I., Preine, J., Tominaga, M., Nomikou, P., Druitt, T., Kutterolf, S., Beethe, S., Ronge, T. A., Hübscher, C., Karstens, J., Kletetschka, G., Yamamoto, Y., Woodhouse, A., Gertisser, R., Peccia, A., Clark, A. and IODP Expedition 398 Participants 2025. Contrasting seismic velocity and compaction of marine calcareous oozes and volcaniclastic deposits on the South Aegean Volcanic Arc. Geochemistry, Geophysics, Geosystems 26 (9) , e2025GC012327. 10.1029/2025gc012327

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Abstract

Plain Language Summary: The density and seismic velocity of marine sediments, and how they vary with depth, depend on the properties of the sediment, including their composition and the sizes and shapes of particles. International Ocean Discovery Program Expedition 398 recovered volcanic and non‐volcanic sediment from the South Aegean Volcanic Arc in the Mediterranean Sea. Shipboard measurements on these samples enable us to understand some of the controls on sediment density and seismic velocity. Deposits of particles with volcanic origins have higher seismic velocities than other marine sediments, despite having lower densities. The low density arises in part because volcanic particles contain vesicles that are filled with water and gas. The higher seismic velocity is due to smaller amounts of pore space around the volcanic particles in addition to the trapped gas (bubbles) inside the particles. Densities and seismic velocities of volcanic particles increase more slowly with increasing depth than other marine sediments. Together, the measurements and trends help guide the interpretation of seismic images of seafloor deposits.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Earth and Environmental Sciences
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/
Publisher:	Wiley
ISSN:	1525-2027
Date of First Compliant Deposit:	30 September 2025
Date of Acceptance:	3 September 2025
Last Modified:	30 Sep 2025 10:00
URI:	https://orca.cardiff.ac.uk/id/eprint/181404

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