investigating earthquakes nucleation from the resposne of himalayan seismicity to the monsoon...
DESCRIPTION
TIBETINDIA GPS LOADING OF THE INDIAN PLATE DUE TO THE MONSOON NEPAL earthquakesTRANSCRIPT
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Investigating earthquakes nucleation from the resposne of
Himalayan seismicity to the Monsoon
Thomas ADER, Kristel ChanardNadia LAPUSTA, and Jean-Philippe AVOUAC
December 9, 2011
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TIBETINDIAGPS
LOADING OF THE INDIAN PLATEDUE TO THE MONSOON
NEPAL
earthquakes
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Modified from Bettinelli et al. (2008)
GPS
GPS
TIBETINDIANEPAL
TIBETINDIA NEPAL
earthquakes
earthquakes
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GPS
S
N
Seismicity
Montrer la serie GPS avec la prediction du modele de Kristel
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Also periodic stress due to tidesC
oulo
mb
stre
ss
3kPa
time time2 stresses with roughly the same amplitude (~3kPa) but different periods but…
-No correlation of seismicity with tidal stress- Correlation with hydrological cycle (Monsoon)
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• Nucleation is time dependent. • Nucleation predicted by rate-and-state friction
on finite size faults can explain our observations• The 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