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

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

  • 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.