Two-dimensional viscosity structure of the northeastern Japan islands arc-trench system

Jun Muto, Bunichiro Shibazaki, Yoshihiro Ito, Takeshi Iinuma, Mako Ohzono, Takumi Matsumoto, Tomomi Okada

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Two-dimensional viscosity profiles were constructed for the northeastern Japan islands arc-trench system covering the source area of the 2011 Tohoku-Oki earthquake. From seismologically determined models of lithospheric structure, experimentally derived constitutive laws of various rocks, and densely measured geothermal gradient data, we have predicted the steady state effective viscosity across the subduction zone. The profile reveals strong lateral viscosity gradients both parallel and normal to the trench axis. The detailed viscosity structures presented here contribute to accurate evaluation of viscoelastic relaxation components when modeling geodetically measured postseismic deformation at high spatial and temporal resolution. Key Points Two-dimensional realistic viscosity profiles of the NE Japan were proposed Profiles include thermal and structural heterogeneities of the NE Japan Evaluation of viscous relaxation component requires realistic viscosity structure

Original languageEnglish
Pages (from-to)4604-4608
Number of pages5
JournalGeophysical Research Letters
Volume40
Issue number17
DOIs
Publication statusPublished - 2013 Sep 16

Keywords

  • Tohoku-Oki earthquake
  • postseismic deformation

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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