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Article Dans Une Revue Nature Communications Année : 2024

Change of deep subduction seismicity after a large megathrust earthquake

Résumé

Subduction zones are home to the world’s largest and deepest earthquakes. Recently, large-scale interactions between shallow (0-60 km) and intermediate (80-150 km) seismicity have been evidenced during the interseismic period but also before and after megathrust earthquakes along with large-scale changes in surface motion. Large-scale deformation transients following major earthquakes have also been observed possibly due to a post-seismic change in slab pull or to a bending/unbending of the plates, which suggests the existence of interactions between the deep and shallow parts of the slab. In this study, we analyze the spatio-temporal variations of the declustered seismicity in Japan from 2000 to 2011/3/11 and from 2011/3/11 to 2013/3/11. We observe that the background rate of the intermediate to deep (150-450 km) seismicity underwent a deceleration of 55% south of the rupture zone and an acceleration of 30% north of it after the Tohoku-oki earthquake, consistent with the GPS surface displacements. This shows how a megathrust earthquake can affect the stress state of the slab over a 2500 km lateral range and a large depth range, demonstrating that earthquakes interact at a much greater scale than the surrounding rupture zone usually considered.
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hal-04496293 , version 1 (08-03-2024)

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Blandine Gardonio, David Marsan, Thomas Bodin, Anne Socquet, Stéphanie Durand, et al.. Change of deep subduction seismicity after a large megathrust earthquake. Nature Communications, 2024, 15, pp.60. ⟨10.1038/s41467-023-43935-3⟩. ⟨hal-04496293⟩
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