Seafloor observations indicate spatial separation of coseismic and postseismic slips in the 2011 Tohoku earthquake

Takeshi Iinuma, Ryota Hino, Naoki Uchida, Wataru Nakamura, Motoyuki Kido, Yukihito Osada, Satoshi Miura

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Large interplate earthquakes are often followed by postseismic slip that is considered to occur in areas surrounding the coseismic ruptures. Such spatial separation is expected from the difference in frictional and material properties in and around the faults. However, even though the 2011 Tohoku Earthquake ruptured a vast area on the plate interface, the estimation of high-resolution slip is usually difficult because of the lack of seafloor geodetic data. Here using the seafloor and terrestrial geodetic data, we investigated the postseismic slip to examine whether it was spatially separated with the coseismic slip by applying a comprehensive finite-element method model to subtract the viscoelastic components from the observed postseismic displacements. The high-resolution co-and postseismic slip distributions clarified the spatial separation, which also agreed with the activities of interplate and repeating earthquakes. These findings suggest that the conventional frictional property model is valid for the source region of gigantic earthquakes.

Original languageEnglish
Article number13506
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Nov 17

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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