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Gaku KIMURA The University of Tokyo iFREE JAMSTEC

Expectations for international MARGINS' collaborations from the point of view of an "active margin" country. Gaku KIMURA The University of Tokyo iFREE JAMSTEC. One Day Suddenly!. 2004　Sumatra Tsunami. 1944 Tonankai Earthquake Mie Prefecture. Nankai Trough: Longest Historical Record.

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Gaku KIMURA The University of Tokyo iFREE JAMSTEC

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  1. Expectations for international MARGINS' collaborations from the point of view of an "active margin" country Gaku KIMURA The University of Tokyo iFREE JAMSTEC

  2. One Day Suddenly! 2004　Sumatra Tsunami 1944Tonankai Earthquake Mie Prefecture

  3. Nankai Trough: Longest Historical Record 1906 Equador 1923 Kamchatka 1938 Banda 1950 Tibet 1952 Kamchatka 1957 Alaska 1960 Chile 1963 Kuril 1964 Alaska 1965 Rat Alaska 2004 Sumatra 2005 N.Sumatra Top 12 since 20C

  4. Ide et al., 2007

  5. Obana & Kodaira, 2009

  6. Recent Great Discoveries Plate boundary depth contour Rupture Area Rupture Area Rupture Area Deep Low Frequency Tremor Deep ultra-low Frequency Tremor Slow slip Shallow ultra Low Frequency Tremor 南海トラフ 国土地理院／世界最稠密GPS Obara, Science 2002, Ito et al., Science 2007, Ide et al., Nature 2007

  7. Recent Great Discoveries : far field observation Chikyu Shallow LFT Deep LFT Soon: Direct observation within fault zone bore hole

  8. Moore et al., 2009

  9. 3D Nankaiaccretionary wedge Splay Fault Oceanic Crust Decollement Moore et al., 2007, 2009

  10. The splay Fault from the bottom

  11. Many landslides around active portion of the splay fault

  12. Horizontal slice at -2910m Clear deformation of young (<0.5My) slope sediments

  13. Drilling Result of the splay fault Kinoshita, Tobin et al., 2009 南海トラフ海底地形・断面図 フィリピン海プレート 10cm Splay Fault X-ray CT

  14. 1944 Tonankai! Disturbed mud is a key

  15. Analyzed by Yamaguchi et al.

  16. Conclusion Nankai Trough SEIZE is a quite successful on-going international collaboration through individual PIs, IODP frame, Margins program and others. International collaboration is strongly expected from “active margin” countries because natural geo-hazard issues are so serious and urgent. A new frame of international MARGINs is expected in each country.

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