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Proposals for Consideration by the SCIGN Coordinating Board

Proposals for Consideration by the SCIGN Coordinating Board. High-rate Data (2 Hz) Gulf of California Stations. SCIGN Coordinating Board Annual Mtg. by Ken Hudnut; 26 April 2004. High-rate data (2 Hz) Z-12’s can do 2 Hz Z-12’s ring buffers do not function properly Requires technical fix

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Proposals for Consideration by the SCIGN Coordinating Board

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  1. Proposals for Consideration by the SCIGN Coordinating Board • High-rate Data (2 Hz) • Gulf of California Stations SCIGN Coordinating Board Annual Mtg. by Ken Hudnut; 26 April 2004

  2. High-rate data (2 Hz) Z-12’s can do 2 Hz Z-12’s ring buffers do not function properly Requires technical fix Low cost PC104 solution with many added benefits Memory TCP/IP Linux OS Gulf of California sites Limits on uses of the PBO MREFC funds to within USA mean that Mexico-PBO on hold SCIGN-CICESE-UNAVCO partnership at GUAX Caltech and Arizona projects & matching Enthusiasm to go ahead but need funds Proposals for SCIGN CB Consideration

  3. High-rate Data (2 Hz) • High-rate and Real-time are separate issues • RTK users benefit from real-time 1 Hz data, but do not require >1 Hz data rate • Scientists would like high-rate data (latency OK); e.g., at UNAVCO 2004 annual meeting - community said use data buffers to get maximum data rate possible with receivers and memory configuration available (this was similar to the SCIGN decision in 1996) [not real-time] • Operational need for ‘near-real-time’ high-rate data exists for finite fault source models (e.g., ShakeMap); >1 Hz would be helpful, e.g., 2 Hz from the SCIGN Z-12’s but USGS cannot afford it (without ANSS funding) and many seismologists remain skeptical of relative value

  4. Strong-Motion and GPS • Need a several-pronged approach to the overall enhancement of ExNets’ GPS and strong-motion equipment to record future large earthquakes’ ground motions more completely • PBO will not provide all needed near-field stations, nor will USArray - must find another way • SCIGN should fund upgrades to its own equipment (e.g., high-rate buffers for the Z-12’s) • Strong-motion sensors should be welcomed at SCIGN stations (doing this - ANSS?) • Survey-mode GPS ought to be conducted (USGS?) GPS 2 Hz SCIGN Strong-Motion at SCIGN stations Survey-mode GPS at SM stations

  5. 1-sec GPS VS. Integrated Strong Motions Slides courtesy of Dr. Chen Ji, Caltech SSA 2004, Palm Springs

  6. Integrated strong motion Continuous GPS

  7. Synthetic PGV Map (1-sec)

  8. High-rate Upgrades • Principles and Policies • Cost-effective and well-tested so as not to lose data or have other negative impacts on normal operations • In accord with PBO plans for telemetry & data flow (SCIGN should transition to & adopt their Data Plan) • Outside funds for upgrades go to the SCIGN Network Administrator (John McRaney) and are then spent as directed by the SCIGN Coordinating Board • Ramp-up 2-yr. approach recommended • Year 1: $85K to set-up and deploy 75 Vipers high priority stations along San Andreas, SJF, ECSZ, etc. • Year 2: $68K for remaining 75 sites, as appropriate

  9. Gulf of California Stations • All proposed work is collaborative with Javier Gonzalez Garcia at CICESE and his colleagues & collaborators • Loading of the PBO region may or may not be steady in time and space (e.g., Savage, 1971; Press and Allen, 1995; Pollitz et al., 1998); need to test this theory • GUAX established as a check; Gonzalez et al. (2003) velocity is consistent with plate motion models; now need to maintain continuous GPS into the future to see if it remains constant velocity or not over many years • Need to extend this across the Gulf, spanning from Baja to Sonora and crossing to check kinematics of deformation established by survey-mode GPS and recent geological studies • Test stationarity of spatial and temporal deformation within the relatively weak ‘loading’ section of the plate boundary - a must for PBO

  10. Slides courtesy of Prof. Joann Stock, Caltech SSA 2004, Palm Springs • Extension of the Pac-NAm plate boundary into the Gulf of California and the accompanying development of the S. San Andreas fault: • significantly postdates the ~12 Ma (southward) plate boundary jump • appears to also postdate the ~8 Ma change in direction of Pac-Nam motion ~12 Ma ~5 Ma From Nicholson et al. 1994 Geology

  11. From Oskin and Stock (GSAB, 2003)

  12. Other Projects • NARS-Baja broad-band seismological stations by CICESE, Caltech, and Utrecht • CICESE joint projects • Bennett et al. NSF • GUAX collaboration • UNAM & INEGI joint projects

  13. Station Selection & Upgrades • Support monument upgrades at stations identified by Gonzalez and Bennett • Must be built by June 2004 • UNAVCO engineers to build SCIGN SBM’s • Telemetry & receivers OK • NSF funds requested • Select 4 NARS stations to upgrade with good monuments (SCIGN SBM) and continuous GPS in year 1 (may not be feasible to telemeter data) • Reconnaissance of additional stations as needed to complete a braced array of 12 sites along the Gulf Immediate need $20K Year 1 - need $30K Year 2 - need $70K

  14. High-rate data (2 Hz) Improve recording of large near-field deformation from large earthquakes CGPS to max. rate SM at GPS sites Static GPS at SM sites Support smooth PBO transition with 3G Total cost $153K over upcoming 2 years ($85K - yr. 1; $68K - yr. 2) Gulf of California sites Keep GUAX going Help Gonzalez and Bennett with short-term opportunity Identify NARS sites for upgrade to CGPS Select additional sites for completing 10-12 site array within 2-3 years from now Total cost $120K over upcoming 2 years ($50K - yr. 1; $70K - yr. 2) Proposals for SCIGN CB Consideration

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