Application of empirical Green’s functions for the construction and validation of the GBCVM Morgan P. Moschetti and Michael H. Ritzwoller Center for Imaging.

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Presentation transcript:

Application of empirical Green’s functions for the construction and validation of the GBCVM Morgan P. Moschetti and Michael H. Ritzwoller Center for Imaging the Earth’s Interior Univ. of Colorado, Boulder Arthur Rodgers and Anders Petersson Lawrence Livermore National Laboratory GBCVM Workshop, UNR January 14, 2008

Overview  Ambient noise processing for EGFs  Dispersion measurements for surface wave tomography  3-D inversion - shear wave velocity values  Comparison of EGFs and synthetics from the USGS Bay Area 3-D velocity model.  Application to GBCVM (Weaver, 2005)

Ambient Noise Processing for empirical Green’s functions time (s) – 10 sec 10 – 20 sec 20 – 35 sec Broadband time (s) 16 Month Stack Station Y12C Station 109C Normalized velocity Distance: 258 km

period (s) U (km/s) Rayleigh group velocities

Rayleigh Wave Group Velocity, 8-sec

Rayleigh Wave Phase Velocity Maps 477 stations (USArray TA and regional networks) – 0.5 degree grid > 100,000 inter-station paths Ability to improve local resolution with higher density arrays

Local Dispersion curves for inversion Period (s) Rayleigh wave phase velocity maps Love wave phase velocity maps Period (s) c (km/s), Love c (km/s), Rayleigh

Neighbourhood Algorithm to define an ensemble of acceptable models Period (s) c (km/s), Love c (km/s), Rayleigh

Crustal thickness estimates Crustal thickness (km)

Upper and middle crust slices

Lower crust and upper mantle slices

Rayleigh waveform comparisons – validation of the USGS Bay Area 3-D Velocity Model (from collaboration with Rodgers and Petersson, LLNL.) BKS-MNRCBKS-BNLO red: EGF green: synthetic

Inter-station paths with good measurements USGS Bay Area 3-D model – two domains 130 common paths (EGF/synthetics) EGFs limited by stations, synthetics limited by model.

Rayleigh wave dispersion measurements period (s) Velocity (km/s) period (s) Group velocitiesPhase velocities BKS - MNRC period (s) Velocity (km/s) period (s) Group velocitiesPhase velocities BKS - BNLO

Rayleigh wave 10-sec difference map Group velocityPhase velocity

Conclusions and Future Work  Empirical Green’s functions within and across Nevada for comparison and inversion.  Shear-wave velocities across Nevada for background values and model/inversion constraint.  Comparison of EGF and synthetic waveforms allows for validation and assimilation of models.  Improved data coverage from higher density arrays.