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Abstract Using high‐resolution 3D tomography and a relocated 2010–2022 earthquake catalog, we identify a seamount at 20–25 km depth beneath the Mompiche–Cojimíes region in the coastal forearc of Ecuador. This provides a rare, well‐resolved example of seamount preservation at these depths. The seamount coincides with a low interseismic‐coupling corridor and shows persistent seismicity along its flanks. Rupture of the 2016 Mw 7.8 Pedernales earthquake initiated on the southern flank of the seamount. The rupture propagated south, but northward propagation was arrested near the decoupled, aseismic crest, illustrating the dual mechanical behavior of the seamount. After the megathrust earthquake, seismicity migrated downdip, particularly along the eastern margin. These results show the influence of subducted topography on coupling, seismicity, and rupture segmentation in megathrust systems.
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This content will become publicly available on March 10, 2027
Exploring the Theoretical Foundation with Rupture and Delayed Rupture Experiments
- PAR ID:
- 10673758
- Publisher / Repository:
- American Chemical Society
- Date Published:
- Journal Name:
- Macromolecules
- Volume:
- 59
- Issue:
- 5
- ISSN:
- 0024-9297
- Page Range / eLocation ID:
- 2885 to 2893
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
