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DOGAMI scientist urges Depoe Bay residents to treat long shaking as tsunami warning
Summary
Laura Gable of the Oregon Department of Geology and Mineral Industries (DOGAMI) told the Depoe Bay Resilience Committee that a full-margin Cascadia subduction-zone earthquake will cause prolonged shaking and a tsunami expected to arrive in tens of minutes, and she outlined evacuation timing, hazards and local impact estimates for Depoe Bay.
Laura Gable, a geologist with the Oregon Department of Geology and Mineral Industries (DOGAMI), told the Depoe Bay Resilience Committee that a full-margin Cascadia subduction-zone earthquake will produce long, rolling shaking and a tsunami that could reach local shores within about 20 minutes.
Gable, who identified herself as working from DOGAMI's coastal field office in Newport, said the nearest portion of the Cascadia Subduction Zone sits roughly 60 miles offshore and that when a large rupture occurs it can shake for minutes. "If there is an earthquake that shakes for more than a minute, you need to assume that a tsunami is on its way," she said. She emphasized that for a local subduction event, early warning systems may be ineffective and personal recognition of the shaking is the primary immediate alarm.
Why it matters: DOGAMI’s briefing focused on life-safety messaging and local consequences for Depoe Bay, a community with limited inland high…
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