The California Geological Survey (CGS), which is a branch of the California Department of Conservation, recently updated its Tsunami Hazards Maps that affect Marin, Sonoma, Napa, and Solano counties — showing an increased risk of inland flooding for each of them.

After an explosion at Hunga Tonga-Hunga Ha’apai volcano triggered a global tsunami warning — the blast likely the most violent eruption ever captured by satellite — deep waves of displaced water began traveling toward the Bay Area in what was the region's most threatening tsunamic event in a decade.