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The TriNet Project: 1997-2001. James D. Goltz Ph.D. Earthquake and Tsunami Program Governor’s Office of Emergency Services May 26, 2006. What was TriNet?. TriNet was a collaboration between Caltech, USGS and CDMG (now CGS)

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The trinet project 1997 2001

The TriNet Project: 1997-2001

James D. Goltz Ph.D.

Earthquake and Tsunami Program

Governor’s Office of Emergency Services

May 26, 2006

What was trinet
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

Why was trinet needed
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

Network upgrades under trinet
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

Trinet products
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

Near real time notification
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


  • 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

Shakemap for small event near petrolia 3 25 06 m4 6
ShakeMap for Small Event, Near Petrolia 10-16-99, M7.13-25-06, M4.6

Trinet shakemap for tv
TriNet ShakeMap for TV 10-16-99, M7.1

  • Currently Available

  • Very Simple Format

  • TV News Gave Input

  • Move Beyond Epicenter

  • Avoid Confusion Between Magnitude and Intensity

Hazus multi hazard
HAZUS Multi-Hazard 10-16-99, M7.1

Loss estimation outputs
Loss Estimation Outputs 10-16-99, M7.1

  • 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

Trinet earthquake early warning
TriNet Earthquake Early Warning 10-16-99, M7.1

  • 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

Social scientific and public policy studies
Social Scientific and Public Policy Studies 10-16-99, M7.1

  • 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)

Post trinet status
Post-TriNet Status 10-16-99, M7.1

  • 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

Post trinet status of early warning
Post-TriNet Status of Early Warning 10-16-99, M7.1

  • 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