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