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Imaging the Main Himalayan Thrust fault: How localized is it ?

Imaging the Main Himalayan Thrust fault: How localized is it ?. Ge 277 February 17, 2011. DIRECTIONS. 3. FURTHER NORTH. THIS WAY. 2 . CREEPING PART. 1. LOCKED PART. Tectonic settings. SOUTH. NORTH. CREEPING. LOCKED. Locked along ~100km, creeping further.

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Imaging the Main Himalayan Thrust fault: How localized is it ?

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  1. Imaging the Main Himalayan Thrust fault:How localized is it ? Ge 277 February 17, 2011

  2. DIRECTIONS 3. FURTHER NORTH THIS WAY 2. CREEPING PART 1. LOCKED PART

  3. Tectonic settings SOUTH NORTH

  4. CREEPING LOCKED

  5. Locked along ~100km, creeping further. • Width of the creeping zone ? • Previous model: 0km. • Cattin & Avouac: a few km • Need direct imaging of the creeping part of the fault.

  6. INDEPTH MAGNETOTELLURIC EXPERIMENT SEISMIC IMAGING

  7. HI-CLIMB EXPERIMENT (Nabelek et al 2009)

  8. HIMNET (Shulte-Peklum et al, Nature, 2005)

  9. INDEPTH RESULTS MHT fairly localized (< few km)

  10. COMPARISON WITH TEMPERATURE (Herman et al, 2010) ZONE OF ABOUT 300 TO 700 °C

  11. FURTHER NORTH ZONE OF PARTIAL MELT MHT DOESN’T APPEAR ANYMORE

  12. HI-CLIMB (Nabelek et al 2009)

  13. HIMNET (Shulte-Peklum et al, Nature, 2005)

  14. CONCLUSIONS • Shallowest part of the fault locked • Creeping part localized (thickness < few km). Not enough resolution to tell if the thickness is of the order of a few km or a few meters (cm). • Further north (temperature > 700 °C), crust probably partially molten, fault not localized.

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