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      Propagation of slow slip leading up to the 2011 M(w) 9.0 Tohoku-Oki earthquake.

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          Abstract

          Many large earthquakes are preceded by one or more foreshocks, but it is unclear how these foreshocks relate to the nucleation process of the mainshock. On the basis of an earthquake catalog created using a waveform correlation technique, we identified two distinct sequences of foreshocks migrating at rates of 2 to 10 kilometers per day along the trench axis toward the epicenter of the 2011 moment magnitude (M(w)) 9.0 Tohoku-Oki earthquake in Japan. The time history of quasi-static slip along the plate interface, based on small repeating earthquakes that were part of the migrating seismicity, suggests that two sequences involved slow-slip transients propagating toward the initial rupture point. The second sequence, which involved large slip rates, may have caused substantial stress loading, prompting the unstable dynamic rupture of the mainshock.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Feb 10 2012
          : 335
          : 6069
          Affiliations
          [1 ] Earthquake Research Institute, The University of Tokyo, Tokyo, Japan. akato@eri.u-tokyo.ac.jp
          Article
          science.1215141
          10.1126/science.1215141
          22267578
          eb9dfb1d-ab75-4068-ba7e-b0854d0b7b44
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