Proposals for Consideration by the SCIGN Coordinating Board
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Transcript of Proposals for Consideration by the SCIGN Coordinating Board
Proposals for Consideration by the SCIGN Coordinating Board
SCIGN Coordinating Board Annual Mtg.
by Ken Hudnut; 26 April 2004
High-rate Data (2 Hz)Gulf of California Stations
Proposals for SCIGN CB Consideration
• 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
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
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?)
GPS2 Hz
SCIGN
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1-sec GPS VS. Integrated Strong Motions
Slides courtesy of Dr. Chen Ji, CaltechSSA 2004, Palm Springs
Continuous GPS
Integrated strong motion
Synthetic PGV Map (1-sec)
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
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
From Nicholson et al. 1994 Geology
~12 Ma ~5 Ma
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
Slides courtesy of Prof. Joann Stock, CaltechSSA 2004, Palm Springs
From Oskin and Stock(GSAB, 2003)
Other Projects
• NARS-Baja broad-band seismological stations by CICESE, Caltech, and Utrecht
• CICESE joint projects– Bennett et al. NSF– GUAX collaboration
• UNAM & INEGIjoint projects
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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
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Immediate need $20K
Year 1 - need $30K
Year 2 - need $70K
Proposals for SCIGN CB Consideration
• 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)