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On the relation between Geodetic strain, Seismicity and fault frictional properties

On the relation between Geodetic strain, Seismicity and fault frictional properties. Nepal Sumatra Taiwan. Sumatra. Variability of interseismic coupling (using PCAIM on coral data). Analysis of strong motion data and high rate GPS Analysis of aftershocks

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On the relation between Geodetic strain, Seismicity and fault frictional properties

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  1. On the relation between Geodetic strain, Seismicity and fault frictional properties • Nepal • Sumatra • Taiwan

  2. Sumatra • Variability of interseismic coupling (using PCAIM on coral data). • Analysis of strong motion data and high rate GPS • Analysis of aftershocks • Modeling of large scale postseismic relaxation • Cause of earthquake clustering in Sumatra • Inversion of postseismic data for heterogeneity of frictional properties

  3. Nepal • Interseismic coupling • Analysis of temporal variations of seismicity and geodesy • Implications for EQs nucleation

  4. Locked Fault Zone This model of interseismic strain (1995-2005) indicates an accumulation rate of deficit of seismic moment of 4.3 1019 Nm/yr (Bollinger et al, 2004, Bettinelli et al, 2006) Mw 7.6 (2005 Kashmir EQ): 7 yr Mw 8.2 (1934 Bihar-Nepal EQ): 100 yr

  5. Seismicity and Coulomb stress change due to interseismic strain (Bollinger et al, JGR, 2004) • Seismicity coincides with the area where Coulomb stress increases by more than 4kPa/yr. • The influence of topography on the seismicity distribution show that the deviatoric stresses driving deformation are actually low, less than about 35 MPa

  6. Horizontal displacements relative to India SIM DAMA NAGA GUMB LHAS Seasonal variation of Horizontal Displacements (Bettinelli et al, 2008)

  7. Seismicity is enhanced in the winter when shortening rate across the Himalayan is increased.

  8. Amplitude of seasonal variations of surface loading derived from GRACE

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