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Advancing Cascadia Early Earthquake Warning System (EEW) Initiative

Delve into the progress and challenges of the EEW initiative in the Cascadia region involving UW, CIT, UCB, CWU, and USGS. The goal is to provide advanced EEW services on the West Coast and recognize megathrust ruptures accurately. Challenges include weak instrumentation and jurisdictional issues.

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Advancing Cascadia Early Earthquake Warning System (EEW) Initiative

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  1. Cascadia EEW in PNSN • A Snapshot

  2. Structure & Direction • UW participation in GBMF “Moore” grant • CIT, UCB, UW, (CWU) and USGS • Objective: deliver prototype EEW to sophisticated customers west-coast wide. • Overall goal: obtain long-lived general EEW services in Western US. (Involves “politics”).

  3. UW - The Heart of Cascadia • Challenges: behind Calif., several jurisdictions, weak instrumentation. • Focus: recognition of a large Cascadia megathrust rupture in progress (or not). • First step towards more complete system • Ultimate system must be delineated soon.

  4. Specific target • Recognize M7.5+ events with 10-20s • Evaluate odds of various scenarios of bigger earthquakes are developing • Issues • Must eliminate false alarms • One-sided coverage • Gutenburg-Richter distribution? • Identification of non-subduction events • Identification of finite-faulting very useful

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