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State geologists brief Humboldt County on tsunami hazards: ‘Cascadia tsunami could arrive in 10–15 minutes’
Summary
California Geological Survey staff presented probabilistic tsunami hazard analysis for the North Coast, explained the mapping criteria used to create evacuation lines, and urged communities to plan and drill; CGS recommended using the 1,000‑year tsunami for hazard-area mapping and noted that subsidence and sea‑level rise are included in probabilistic models.
The Humboldt County Planning Commission received an informational workshop on May 7 from the California Geological Survey (CGS) about North Coast tsunami hazards and mapping methods.
Jay Patton of the CGS tsunami unit (speaker 16) explained how Probabilistic Tsunami Hazard Analysis (PTHA) uses logic trees and thousands of simulated earthquake‑slip scenarios to develop hazard curves and inundation models. Patton said roughly “85% of tsunamis are caused by large earthquakes below the sea floor,” and that the CGS used the…
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