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Crustal deformation associated with the Mw7.2 2010 El Mayor- Cucapah earthquake from GPS geodesy

Crustal deformation associated with the Mw7.2 2010 El Mayor- Cucapah earthquake from GPS geodesy. 2011 SCEC Annual Meeting Joshua Spinler, Richard Bennett, Javier Gonzalez-Garcia, and Chris Walls. Outline. Photo taken by John Fletcher, CICESE. GPS Data Processing Time series analysis

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Crustal deformation associated with the Mw7.2 2010 El Mayor- Cucapah earthquake from GPS geodesy

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  1. Crustal deformation associated with the Mw7.2 2010 El Mayor-Cucapah earthquake from GPS geodesy 2011 SCEC Annual Meeting Joshua Spinler, Richard Bennett, Javier Gonzalez-Garcia, and Chris Walls

  2. Outline Photo taken by John Fletcher, CICESE • GPS Data Processing • Time series analysis • Deformation associated with the M7.2 El Mayor-Cucapah and M5.7 Southern California earthquakes of 2010 • New PBO-Mexico CGPS network PBO Site PLTX

  3. Southern California CGPS • 102 CGPS sites located within 250 km of EMC earthquake • Sites part of both PBO and SCIGN CGPS Networks • Seismicity for period 4/4/2011 – 6/15/2011 (from E. Hauksson)

  4. Time Series Analysis M5.7 Southern California EQ   M7.2 El Mayor Cucapah EQ

  5. Time Series Analysis M5.7 Southern California EQ   M7.2 El Mayor Cucapah EQ

  6. Time Series Analysis • Constrained Random Search method • Brachetti et al. 1997, Journal of Global Optimization • Finds the minimum of a multi-variable function • Simultaneously solve for 22 different parameters using an exponential decay function • Parameters: Initial offset, Velocity, Annual and Semi-annual perturbations, Coseismic displacement, Postseismic deformation, exponential decay time • Minimize misfit to the horizontal coordinate time series data (NRMS)

  7. Time Series Analysis – Site P481

  8. Time Series Analysis – Site P481 NRMS = 0.68

  9. Time Series Analysis – Site P494

  10. Time Series Analysis – Site P494 Mean NRMS for all sites = 0.76 NRMS (P494) = 1.20

  11. Coseismic displacement April 4, 2010 M7.2 El Mayor-Cucapah

  12. Coseismic displacement June 15, 2010 M5.7 Southern California

  13. Exponential Decay Time • Mean decay time (EMC) = 629 ± 75 days • Mean decay time (SoCal) = 682 ± 67 days • Viscosity (η) = τμ = 1.6 x 1018 Pa-s • Relatively weak lower crust and/or upper mantle

  14. Conclusions Using the CRS method allows for detailed analysis of complicated GPS coordinate time series data Future work: Fault slip modeling and analysis of postseismic deformation signal Include campaign GPS spanning the earthquakes from northern Baja

  15. PBO in Baja California • Locations for sites strategically chosen to best resolve postseismic deformation patterns and lower crustal/upper mantle rheology

  16. PBO in Baja California Site PLPX Installed 10/27/10

  17. PBO in Baja California Site PALX Installed 9/2/10

  18. PBO in Baja California Installed 4/27/11 Installed 2/11/11 Installed 10/29/10 Installed 8/30/10

  19. Seven new CGPS sites installed in northern Baja California, Mexico, and the data is available online at www.unavco.org Funding for these projects provided by NSF and SCEC

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