New research reveals that the San Andreas and San Jacinto fault systems in Southern California are under the highest tectonic stress in at least 1,000 years, raising long-term earthquake risk. - The fault system is described as "critically loaded," with stress building across multiple connected segments.
- A multi-fault earthquake could affect densely populated areas from the Coachella Valley to Los Angeles. - The San Andreas is a strike-slip fault, so California will not fall into the ocean; movement is horizontal.
- California's Earthquake Early Warning system and Drop, Cover, and Hold On can help residents prepare. While no imminent earthquake is predicted, the study highlights the need for continued preparedness in Southern California.