Imaging the main himalayan thrust fault how localized is it
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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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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.

  • Width of the creeping zone ?

    • Previous model: 0km.

    • Cattin & Avouac: a few km

  • Need direct imaging of the creeping part of the fault.


INDEPTH

MAGNETOTELLURIC EXPERIMENT

SEISMIC IMAGING


HI-CLIMB EXPERIMENT

(Nabelek et al 2009)


HIMNET

(Shulte-Peklum et al, Nature, 2005)


INDEPTH RESULTS

MHT fairly localized (< few km)


COMPARISON WITH TEMPERATURE

(Herman et al, 2010)

ZONE OF ABOUT 300 TO 700 °C


FURTHER NORTH

ZONE OF PARTIAL MELT

MHT DOESN’T APPEAR ANYMORE


HI-CLIMB

(Nabelek et al 2009)


HIMNET

(Shulte-Peklum et al, Nature, 2005)


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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