SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Data collection, synthesis,and products
Kenneth W. Hudnut
U. S. Geological Survey
SCEC 2000 Meeting
SCEC Highlights Session
Monday, September 18, 2000
Oxnard, California
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
The SCEC Data Center
• Data openly and readily available– Catalog– Phase data– Seismograms on-line– Other data (e.g., GPS data and crustal motion
map, WInSAR, 3D seismic velocity models)
• Set new standards leading to CISN– RDBMS (Oracle)– Web-based data searching and access
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
SCEC DC data users
Data are being usedby many people atnumerous institutions
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Fence Diagram from the SCEC Seismic Velocity Model of Southern California
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Gathering & distributing crucially important data
• Strong motion database
• Aftershock & GPS deployment data– Landers– Northridge– Hector Mine
• Fault Zone trapped wave experiments– Landers– Hector Mine
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Aftershock deployments and data distribution
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
A USGS - SCEC Cooperative Project: LA Region Seismic Experiment II
SCEC and USGS conductedthe seismic imaging surveyof the Los Angeles regionin October 1999 as part ofThe National Earthquake Hazards Reduction Program.
The existence of SCEC and partnerships enabled very ambitious field deployments, resulting in much new data and important insights into the deep crustal structure.
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Los Angeles Regional Seismic ExperimentLARSE
Top panel:
Crustal structure image across the Los Angeles basin and San Gabriel Mountains from seismic transect.
Bottom panel: Interpretation of fault structure based on data from top panel.
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
SCEC crustal motion mapCombined EDM,
VLBI, survey-
mode and
continuous GPS
rigorouslyReleased as a
SCEC productSet the bar very
high for the
SCIGN project
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
SCIGN is a large multi-institutional project,engendered & facilitated by SCEC
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Paleoseismology
• Systemmatic investigation of fault systems:– San
Andreas– Eastern
California Shear Zone
– LA region
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
New methods to explore, new synergies between data types
• Combinations of seismic, geologic, and geodetic data in new ways
– Source modelling
– Hazard modelling
• Cross-overs between fields
– Geology and geodesy with InSAR and ALSM
– Seismology and geodesy with high-rate GPS
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
Archiving, assimilating, synthesizing, and distributing data
• Research vitality depends on free access to data• SCEC has synthesized data collected during the first
two decades of NEHRP funding into seismic hazard models
• Data distribution and archiving systems, as well as free exchange of software, free researchers to study and understand the data more and accelerate new developments– Internet, WWW, open-source, open data
• We researchers all benefit from these societal trends• The public can in turn benefit from our efforts as we
disseminate our results to a wider audience
SOUTHERN CALIFORNIA EARTHQUAKE CENTER
SCEC Webservices
www.scec.org www.scecdc.scec.org
~10,000 pages viewed per week1200 view Outreach1000 view INSTANeT News1000 view Research 300 view worldwide Eq’s300 view “About SCEC”
~250,000 Visitors per week