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Articles | Volume 16, issue 10
Articles | Volume 16, issue 10
https://doi.org/10.5194/se-16-1059-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-1059-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 10
Research article
 | 
10 Oct 2025
Research article |  | 10 Oct 2025

Seismicity and thermal structure of the St. Paul Transform System, equatorial Atlantic: insights from focal depth analysis

Guilherme W. S. de Melo, Ingo Grevemeyer, Sibiao Liu, Marcia Maia, and Lars Rüpke

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Short summary
The St. Paul Transform System on the equatorial Atlantic is a seismically oceanic transform fault system. This study re-examines the focal depths of 35 earthquakes (MW 5.3–6.9) from Transforms A, B, and C. The data suggest that the seismogenic zone ranges from 5 to 18 km deep, with the deepest occurring in cooler lithosphere around the center of the transform segments. This challenges earlier hypotheses and indicates a global pattern of cooler mantle in center of oceanic transform faults.
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