Study: Cascadia quakes may trigger San Andreas

A peer‑reviewed analysis led by Chris Goldfinger (Oregon State University), published in Geosphere last week, finds marine‑sediment evidence that large Cascadia subduction‑zone earthquakes may have triggered near‑immediate large ruptures on the San Andreas system. Researchers interpreted more than 100 sediment cores near the Mendocino Triple Junction and identified eight 'double‑decker' turbidite deposits over the past ~3,000 years that radiocarbon dating ties to Cascadia events (including the 1700 megathrust), suggesting paired 'one‑two' quake scenarios that could change West Coast seismic‑hazard thinking.