The Modoc Plateau has both active volcanoes and faults.In addition to volcanoes, this is also earthquake country. The Trinity Mountains, Modoc Plateau, Shasta and Lassen peaks were created by geologic forces that are still shaping the landscape.*The 76% probability of one or more magnitude 7.0 earthquakes striking Northern California is based on a 30-year period, beginning in 2014.īutte, Glenn, Lassen, Modoc, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity See the USGS interactive fault map to learn more about faults in this area Landslides are possible on steep hillsides. Houses on liquefied soil may settle or even move laterally on gentle slopes. Soils in lowland areas away from major faults may be subject to liquefaction.
Very large earthquakes occurring close to the coast could cause damaging levels of ground shaking and tsunami waves.Scientists report that partial ruptures of the Cascadia Seismic Zone occurring on the southern half (which extends into Northern California) have historically generated earthquakes with magnitude 8 or greater.This zone is capable of generating an earthquake of a magnitude 9 or larger, occurring-on average-once every 500 years.The Cascadia Subduction Zone stretches underneath the Humboldt-Del Norte county region, extending from Cape Mendocino all the way up through the Pacific Northwest.
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