S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Data collection, synthesis, and products Kenneth W. Hudnut U. S. Geological Survey SCEC 2000 Meeting SCEC Highlights Session Monday, September 18, 2000 Oxnard, California

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER 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

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER SCEC DC data users Data are being used by many people at numerous institutions

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Fence Diagram from the SCEC Seismic Velocity Model of Southern California

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Gathering & distributing crucially important data Strong motion database Aftershock & GPS deployment data –Landers –Northridge –Hector Mine Fault Zone trapped wave experiments –Landers –Hector Mine

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Aftershock deployments and data distribution

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER A USGS - SCEC Cooperative Project: LA Region Seismic Experiment II SCEC and USGS conducted the seismic imaging survey of the Los Angeles region in October 1999 as part of The 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.

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Los Angeles Regional Seismic Experiment LARSE 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.

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER SCEC crustal motion map  Combined EDM, VLBI, survey- mode and continuous GPS rigorously  Released as a SCEC product  Set the bar very high for the SCIGN project

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER SCIGN is a large multi-institutional project, engendered & facilitated by SCEC

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Paleoseismology Systemmatic investigation of fault systems: –San Andreas –Eastern California Shear Zone –LA region

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER 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

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER 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

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER SCEC Webservices ~10,000 pages viewed per week 1200 view Outreach 1000 view INSTANeT News 1000 view Research 300 view worldwide Eq’s 300 view “About SCEC” ~250,000 Visitors per week