Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Articles | Volume 502
Articles | Volume 502
https://doi.org/10.5194/piodp-502-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/piodp-502-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 502
Scientific prospectus
 | 
05 Feb 2026
Scientific prospectus |  | 05 Feb 2026

IODP3 Expedition 502 “Impact of Petit-Spot Magmatism on Subduction Zone Seismicity and Global Geochemical Cycles” Scientific Prospectus

Asuka Yamaguchi, Hiroko Kitajima, and Natsumi Okutsu

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Short summary
IODP3 Expedition 502 will drill the outer-rise area of the Japan Trench, where the sediments above the acoustic basement are thin. The thin sediments are hypothesized to be caused by basalt intrusions or lava flows related to petit-spot magmatism, a type of volcanic activity caused by the bending of the incoming plate near the trench. Our goal is to determine whether petit-spot magmatism is more widespread than previously thought and to understand its role in the Earth's systems.
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