Application of Vector-Type Super Computer to Understanding Giant Earthquakes and Aftershocks on Subduction Plate Boundaries

  • Keisuke Ariyoshi
  • Toru Matsuzawa
  • Yasuo Yabe
  • Naoyuki Kato
  • Ryota Hino
  • Akira Hasegawa
  • Yoshiyuki Kaneda
Conference paper

Abstract

In order to know why megathrust earthquakes have occurred in subduction zones such as the 2011 off the Pacific Coast of Tohoku Earthquake in Japan, we reconsider previous numerical simulation results and try to apply them to actual fields such as the 2004 Sumatra-Andaman earthquake and large interplate aftershocks of the 2011 Tohoku Earthquake. From this study, we propose that one of the possible reasons of pre-seismic change of the 2011 Tohoku Earthquake might have been smaller for its magnitude because its fault was composed smaller (M 7 class) asperities including the off Miyagi earthquakes as occurred in 1978 and 2005. We also suggest that the next megathrust earthquake along Nankai Trough in southwest Japan may have detectable pre-seismic change because it is composed of three large (M 8 class) asperities in Tokai, Tonankai and Nankai region. Our trial numerical simulation results by using vector-type super computer show that Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET) may be useful to detect the pre-seismic change of a possible M 9 class coupled megathrust earthquake composed of Tokai, Tonankai, Nankai and Hyuga-nada asperities.

Keywords

Tohoku Earthquake Nankai Trough Sumatra Andaman Earthquake Megathrust Earthquake Characteristic Slip 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors would like to deeply appreciate Professor H. Kobayashi for his inviting me to the Workshop on Sustained Simulation Performance 2012. The authors also thank DONET members and Tohoku University researchers. This study was partly supported by supercomputing resources at Cyberscience Center in Tohoku University and at Earth Simulator in JAMSTEC and by Grant-in-Aid (KAKENHI) for Young Scientists 23710212 and for Scientific Research on innovative Areas 20190449.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Keisuke Ariyoshi
    • 1
  • Toru Matsuzawa
    • 2
  • Yasuo Yabe
    • 2
  • Naoyuki Kato
    • 3
  • Ryota Hino
    • 2
  • Akira Hasegawa
    • 2
  • Yoshiyuki Kaneda
    • 1
  1. 1.Earthquake and Tsunami Research Project for Disaster PreventionJapan Agency for Marine-Earth Science and TechnologyYokohamaJapan
  2. 2.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of ScienceTohoku UniversitySendaiJapan
  3. 3.Earthquake Research InstituteThe University of TokyoTokyoJapan

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