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Lithospheric Structure of the Gulf of California – Salton Trough Region, NARS-Baja Array

Lithospheric Structure of the Gulf of California – Salton Trough Region, NARS-Baja Array. Working Group: Robert Clayton, Caltech Don Forsyth, Brown Antonio Gonzalez-Fernandez, CICESE Craig Jones, Colorado Cecillio Rebollar, CICESE Jose Romo-Jones, CICESE. Science Questions :

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Lithospheric Structure of the Gulf of California – Salton Trough Region, NARS-Baja Array

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  1. Lithospheric Structure of the Gulf of California – Salton Trough Region, NARS-Baja Array Working Group: Robert Clayton, Caltech Don Forsyth, Brown Antonio Gonzalez-Fernandez, CICESE Craig Jones, Colorado Cecillio Rebollar, CICESE Jose Romo-Jones, CICESE

  2. Science Questions: • What is the rifting process and how does it vary from north • to south in the Gulf • What is the role of the remnant slab – where does it exist. • Methods • Map of the Moho from seismic and other geophysical methods. • Map of the lithosphere/asthenosphere boundary. • Velocity Variations from tomography studies. • Flow directions from anisotropy • Current strain from earthquakes • Products • 3D regional-scale velocity model • Earthquake catalogue.

  3. Receiver Functions Lewis et al, 2001 Ichinose et al, 1996

  4. Receiver Functions – Southern California Seismic Network Yan and Clayton, 2006

  5. Crustal Thickness From Surface Waves Yang and Forsyth, 2005

  6. NARS-Baja / RESBAN Array http://www.data.scec.org/NARS-Baja/ April, 2002 – April, 2007

  7. Receiver Functions – Gulf of California Persaud, Perez-Campos and Clayton, 2005

  8. NARS-Baja Station NE71 – Northern Baja Pennisula

  9. NARS-Baja Stations NE78 & NE79 – Southern Baja Peninsula

  10. NARS-Baja Station NE75 – Central Baja Peninsula

  11. Cross-Peninsula Profile

  12. I III Along Peninsula Profiles II Lopez-Pineda et al, 2005

  13. Electrical Profile Romo, Gomez-Trevino, Esparza, Garcia-Abdesiem, and Flores-Luna, 2003

  14. Regional 3D Velocity From Surface Waves and Receiver Functions DiLuccio, Clayton, Persaud, Perez-Campos, 2005

  15. Rayliegh Wave Group Velocity Dispersion Curves for Four Events

  16. 3D Regional-scale velocity model for the Gulf of California DiLuccio, Clayton and Persaud, AGU, UGM, 2005

  17. DiLuccio, Clayton and Persaud, AGU, UGM, 2005

  18. Gonzalez-Fernandez et al, 2005

  19. The 2002 Gulf of California Seismic Experiment Lizarralde et al Column

  20. Column Description Top Column Description col 23.456 -117.234 123.0 SAMPLE1 lay 0.0 DEN 2700VS 3.5 DVS 0.015 VP 5.0 DVP 0.015 TOP lay5.0 DEN 2700 DDEN 10.0VS 3.6 VP 6.0 DVP -0.02 lay8.0DEN 2800VS 4.5 VP 7.0 MOHO Moho Interface Names Parameters DEN, DDEN - density VS, DVS - shear velocity VP, DVP - P-wave velocity QS, DQS - S attenuation QP, DQP - P attenuation ???? - anisotropy

  21. Top Moho (lat,lon,z)

  22. SCSN Station JCS – Rapid Variations in Moho

  23. Flow Direction From S-Wave Anisotropy – Rayleigh Vs Love Waves 7071-R 7071-L 8081-R 8081-L Initial model Rayleigh waves Love waves

  24. Microseism – 6 sec – station NE81 Noise Correlation Infrasonic – 30-100 sec – NE82

  25. Receiver Functions of Deeper Interfaces Perez-Campos, Persaud and Clayton, UGM, AGU 2004

  26. Song and Helmberger, 2002

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