10 Sept 2006SCEC/USGS Workshop: CA 3D Seismic Velocity Model The Role of Ambient Noise Tomography in Developing the California 3-D Seismic Velocity Model: Brief Thoughts Ventura basin LA basin Central Valley Imperial Valley Shapiro, Stehly, Campillo, & Ritzwoller, High resolution surface wave tomography from ambient seismic noise, Science, 307, 615, March 11, Oct, 2004 Past: application to So. CA. group speed maps short periods ( s). Present: refinement of the method application to new regions extension to phase velo- cIties & Love waves larger scales, longer periods smaller scales, shorter periods inversion for 3D Vs. Near Future: joint interpretation with other data.

SCEC/USGS Workshop: CA 3D Seismic Velocity Model Applications to New Regions (W. US Using TA/ USArray) & Inversion for a Crustal Vs Model 16 sec, group velocity, 10/04-7/06 Map by Morgan Moschetti

SCEC/USGS Workshop: CA 3D Seismic Velocity Model 16 sec, group velocity, 10/04-7/06 group velocity San Joaquin Valley Applications to New Regions (W. US Using TA/ USArray) & Inversion for a Crustal Vs Model

SCEC/USGS Workshop: CA 3D Seismic Velocity Model 16 sec, group velocity, 10/04-7/06Preliminary crustal thickness Applications to New Regions (W. US Using TA/ USArray) & Inversion for a Crustal Vs Model Inversion by Morgan Moschetti

SCEC/USGS Workshop: CA 3D Seismic Velocity Model Extension to Phase Velocities at Longer Periods: High Resolution Mantle Constraints 25 sec Phase velocity Ambient noise Yang & Moschetti 25 sec Phase velocity Teleseismic 2-plane wave method Yang & Forsyth

SCEC/USGS Workshop: CA 3D Seismic Velocity Model Closing Comment on the Use of Ambient Noise Tomography The Role of Ambient Noise Tomography in Developing the California 3-D Seismic Velocity Model: Closing Comments Complements other kinds of information: homogeneously distributed provides a means to integrate models from different regions way to extrapolate the model into new areas Vs in the crust & uppermost mantle More useful than traditional surface wave data: significantly higher resolution shorter period, provide constraints on the crust. Easily introduced into inversions in which other data are interpreted jointly and with a priori constraints.

SCEC/USGS Workshop: CA 3D Seismic Velocity Model 35.5, 242 Tehachapi Mtns

SCEC/USGS Workshop: CA 3D Seismic Velocity Model 37, 242 White Mtns

SCEC/USGS Workshop: CA 3D Seismic Velocity Model