Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia
ScienceAdvances
By: Suzanne M. Carbotte, Brian Boston, Shuoshuo Han, Brandon Shuck, Jeffrey Beeson, Juan Pablo Canales, Harold Tobin, Nathaniel C. Miller, Mladen Nedimovic, Anne M. Tréhu, Michelle Lee, Madelaine Lucas, Hanchao Jian, Danqi Jiang, Liam Moser, Christine S. Anderson, Darren Judd, Jaime Fernandez, Chuck Campbell, Antara Goswami, and Rajendra Gahlawat
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Abstract
The origin of rupture segmentation along subduction zone megathrusts and linkages to the structural evolution of the subduction zone are poorly understood. Here, regional-scale seismic imaging of the Cascadia margin is used to characterize the megathrust spanning ~900 km from Vancouver Island to the California border, across the seismogenic zone to a few tens of kilometers from the coast. Discrete domains in lower plate geometry and sediment underthrusting are identified, not evident in prior regional plate models, which align with changes in lithology and structure of the upper plate and interpreted paleo-rupture patches. Strike-slip faults in the lower plate associated with oblique subduction mark boundaries between regions of distinct lower plate geometry. Their formation may be linked to changes in upper plate structure across long-lived upper plate faults. The Juan de Fuca plate is fragmenting within the seismogenic zone at Cascadia as the young plate bends beneath the heterogeneous upper plate resulting in structural domains that coincide with paleo-rupture segmentation.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia |
| Series title | ScienceAdvances |
| DOI | 10.1126/sciadv.adl3198 |
| Volume | 10 |
| Year Published | 2024 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | eadl3198, 19 p. |
| Country | United States |
| State | Oregon, Washington |
| Google Analytic Metrics | Metrics page |