Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia

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2024-06-07
Authors
Carbotte, Suzanne M.
Boston, Brian
Han, Shuoshuo
Shuck, Brandon
Beeson, Jeffrey
Canales, J. Pablo
Tobin, Harold
Miller, Nathan
Nedimovic, Mladen R.
Trehu, Anne M.
Lee, Michelle
Lucas, Madelaine
Jian, Hanchao
Jiang, Danqi
Moser, Liam
Anderson, Chris
Judd, Darren
Fernandez, Jaime
Campbell, Chuck
Goswami, Antara
Gahlawat, Rajendra
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10.1126/sciadv.adl3198
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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.
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© The Author(s), 2024. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Carbotte, S. M., Boston, B., Han, S., Shuck, B., Beeson, J., Canales, J. P., Tobin, H., Miller, N., Nedimovic, M., Tréhu, A., Lee, M., Lucas, M., Jian, H., Jiang, D., Moser, L., Anderson, C., Judd, D., Fernandez, J., Campbell, C., Goswami, A., & Gahlawat, R. (2024). Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia. Science Advances, 10(23), eadl3198, https://doi.org/10.1126/sciadv.adl3198.
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Carbotte, S. M., Boston, B., Han, S., Shuck, B., Beeson, J., Canales, J. P., Tobin, H., Miller, N., Nedimovic, M., Tréhu, A., Lee, M., Lucas, M., Jian, H., Jiang, D., Moser, L., Anderson, C., Judd, D., Fernandez, J., Campbell, C., Goswami, A., & Gahlawat, R. (2024). Subducting plate structure and megathrust morphology from deep seismic imaging linked to earthquake rupture segmentation at Cascadia. Science Advances, 10(23), eadl3198.
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