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

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

Ge 277

February 17, 2011


Directions

DIRECTIONS

3. FURTHER NORTH

THIS WAY

2. CREEPING PART

1. LOCKED PART


Tectonic settings

Tectonic settings

SOUTH

NORTH


Imaging the main himalayan thrust fault how localized is it

CREEPING

LOCKED


Imaging the main himalayan thrust fault how localized is it

  • 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

INDEPTH

MAGNETOTELLURIC EXPERIMENT

SEISMIC IMAGING


Hi climb experiment

HI-CLIMB EXPERIMENT

(Nabelek et al 2009)


Himnet

HIMNET

(Shulte-Peklum et al, Nature, 2005)


Indepth results

INDEPTH RESULTS

MHT fairly localized (< few km)


Comparison with temperature

COMPARISON WITH TEMPERATURE

(Herman et al, 2010)

ZONE OF ABOUT 300 TO 700 °C


Further north

FURTHER NORTH

ZONE OF PARTIAL MELT

MHT DOESN’T APPEAR ANYMORE


Hi climb

HI-CLIMB

(Nabelek et al 2009)


Himnet1

HIMNET

(Shulte-Peklum et al, Nature, 2005)


Conclusions

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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