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The TriNet Project: Advancing Earthquake Preparedness in California

TriNet was a collaborative project between Caltech, USGS, and CDMG (now CGS) to upgrade the Southern California Seismic Network post-Northridge earthquake. TriNet aimed to enhance earthquake understanding, improve building codes, and enable better emergency response. It involved installing new stations, improving data communications, developing software, and creating earthquake early warning systems. Despite not fully achieving all goals, TriNet paved the way for the modern seismic network in California. The successor program, CISN, continues to expand network coverage and maintain earthquake preparedness in the state.

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The TriNet Project: Advancing Earthquake Preparedness in California

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  1. The TriNet Project: 1997-2001 James D. Goltz Ph.D. Earthquake and Tsunami Program Governor’s Office of Emergency Services May 26, 2006

  2. What was TriNet? • TriNet was a collaboration between Caltech, USGS and CDMG (now CGS) • Build a state-of-the-art digital seismic network in southern California • Goals: • Improve our understanding of earthquakes • Improve building codes and structural design • Facilitate emergency response • CISN is an effort to extend TriNet statewide

  3. Why was TriNet Needed? • Southern California Seismic Network (SCSN) was in need of upgrading • The SCSN performed poorly during the Northridge earthquake of January 17, 1994 • There was pressure from those dependent on the network for response information • FEMA’s Hazard Mitigation Grant Program provided a potential vehicle for implementation

  4. Network Upgrades Under TriNet • Station installation (new installation or upgrade of 600 stations in Southern CA) • Data communications (real-time telemetry) • Software development • Information distribution & archiving • Knowledge and technology transfer (Outreach) • Consider feasibility of early alert system • Compile data useful for building codes

  5. TriNet Products • Accurate, Reliable and Rapidly Available Source Data (e.g. magnitude, location, depth, focal mechanism) • ShakeMap (mapped ground motion) • ShakeMap/HAZUS Interface • Groundwork for Earthquake Early Warning

  6. Near Real-Time Notification • New network made accurate, reliable and timely notifications possible for small and large EQs • Developed new software to replace CUBE/REDI technology • Under TriNet, groundwork established for “CISN” Display • CISN Display is an Internet based real-time EQ notification technology and gateway to other rapidly available EQ information

  7. CISN Display

  8. Product Links

  9. Earthquake Information via Pager

  10. ShakeMap • One of TriNet’s first products • First map produced 3-17-97 • Displays the distribution of ground shaking • Shows intensity, velocity, acceleration • Maps available on the Internet • Very rapid availability, within 5 minutes • Maps generated for events  M3.5 • Can be used to generate scenarios for exercises

  11. ShakeMap for Large Event: Hector Mine Earthquake of 10-16-99, M7.1

  12. ShakeMap for Small Event, Near Petrolia3-25-06, M4.6

  13. TriNet ShakeMap for TV • Currently Available • Very Simple Format • TV News Gave Input • Move Beyond Epicenter • Avoid Confusion Between Magnitude and Intensity

  14. HAZUS Multi-Hazard

  15. Loss Estimation Outputs • Shaking intensity by census tract or zip code • Casualties (Deaths and Injuries) • Displaced individuals or households • Building damage/losses • Lifeline damage/losses • Critical facility Impacts • Debris generated

  16. TriNet Earthquake Early Warning • One of TriNet’s Goals: develop a pilot earthquake early warning project in southern CA • New network was designed to facilitate incorporation of early warning • Studies carried out on two levels: • Scientific and engineering technical feasibility explored • Sociological and public policy implications examined • Progress made under TriNet but not pilot project originally envisioned

  17. Social Scientific and Public Policy Studies • Literature review for a comprehensive assessment of warning systems for natural hazards and behavioral response to warnings (DRC, University of Delaware) • Survey of organizations likely to become the users of an earthquake early warning system (SRC and School of Public Health, UCLA) • Policy study to consider costs and benefits, legal liabilities, organization and management of an early warning system (EQE International) • Outline of a pilot project to introduce early warning in southern California (EQE International)

  18. Post-TriNet Status • CISN succeeded TriNet with several objectives: • Maintain Dense “TriNet” Southern California Network • Expand Northern California/Bay Region Network • Expand Northern and Central California Rural Coverage • Provide Redundant Processing and Communication • Carry Out a Program of Outreach and Technology Transfer • Carry on Development of an Early Warning Capability • CISN operates with oversight from 5 participating institutions: CA OES, USGS, CGS, Caltech and UCB

  19. Post-TriNet Status of Early Warning • The pilot project envisioned under TriNet was not initiated: • Policy analysis revealed potential legal liabilities for involvement of Caltech (or other private sector entities) in providing warnings • There remained scientific and engineering work to be done in the rapid analysis of an evolving earthquake sequence • A consensus failed to emerge regarding the division of labor among agencies likely to be involved • Some but not all of these issues have been addressed since TriNet concluded

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