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
Investigating earthquakes nucleation from the resposne of
Himalayan seismicity to the Monsoon
Thomas ADER, Kristel ChanardNadia LAPUSTA, and Jean-Philippe AVOUAC
December 9, 2011
TIBETINDIAGPS
LOADING OF THE INDIAN PLATEDUE TO THE MONSOON
NEPAL
earthquakes
Modified from Bettinelli et al. (2008)
GPS
GPS
TIBETINDIANEPAL
TIBETINDIA NEPAL
earthquakes
earthquakes
GPS
S
N
Seismicity
Montrer la serie GPS avec la prediction du modele de Kristel
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)
• 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