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TIBETINDIA GPS LOADING OF THE INDIAN PLATE DUE TO THE MONSOON NEPAL earthquakes

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Investigating earthquakes nucleation from the resposne of Himalayan seismicity to the Monsoon

Thomas ADER, Kristel Chanard

Nadia LAPUSTA, and Jean-Philippe AVOUAC

December 9, 2011

ajouter noms

*

Secular/constant loading rate

Sudden stress change due to a main earthquake: mainshock/aftershock sequences

Here: periodic stresses on the Main Himalayan Fault, underneath Nepal.

The study of earthquake triggering allows testing models of earthquake nucleation

TIBET

INDIA

GPS

LOADING OF THE INDIAN PLATE

DUE TO THE MONSOON

NEPAL

earthquakes

Modified from Bettinelli et al. (2008)

GPS

GPS

TIBET

INDIA

NEPAL

TIBET

INDIA

NEPAL

earthquakes

earthquakes

GPS

S

N

Seismicity

Montrer la serie GPS avec la prediction du modele de Kristel

Also periodic stress due to tides

Coulomb stress

3kPa

time

time

2 stresses with roughly the same amplitude (~3kPa) but different periods but

No correlation of seismicity with tidal stress Correlation with hydrological cycle (Monsoon)

Nucleation is time dependent. Nucleation predicted by rate-and-state friction on finite size faults can explain our observationsThe characteristic time for earthquake nucleation (hence faults frictional properties) can be assessed: long enough so that the response to earth tides (12h) is damped short that enough seismicity response to seasonal variations of stress.

IMPLICATIONS FOR NUCLEATION

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