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California seismic risk research

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2026-09-01 01:24 UTC → 2026-09-04 09:32 UTC · added ~~removed~~

Scientific research has identified an increased risk of a major earthquake in Southern California, specifically regarding the San Andreas Fault. Initial modeling of a magnitude-7.8 rupture suggested the potential for two minutes of shaking, causing hundreds of deaths, billions of dollars in damage, and the disruption of critical infrastructure like aqueducts. Subsequent analysis by geophysicists, including Liliane Burkhard, has expanded on this risk by examining 1,000 years of seismic activity. This research indicates that the danger lies in how ruptures might propagate through interconnected fault systems, such as the San Andreas and San Jacinto faults. The Cajon Pass has been identified as a critical connection point where a single movement could redistribute stress and trigger a chain reaction across multiple fault segments. Recent findings characterize the Cajon Pass as an “earthquake gateway” due to its position at the intersection of the San Andreas and San Jacinto fault systems. Lead author Liliane Burkhard stated that current conditions suggest a major earthquake could occur within the current generation, with researchers estimating a potential magnitude of 7.5 at the intersection. Ken Hudnut, a former expert at the U.S. Geological Survey (USGS), noted that the San Andreas fault is accumulating energy. Further research from the California Institute of Technology warns that the geological structure beneath Los Angeles could significantly amplify tremors. Computer simulations of a potential 7.8 magnitude earthquake near the Salton Sea suggest that seismic waves traveling toward Los Angeles would cause the ground in the downtown area to oscillate for several minutes due to a deep basin of soft sediments acting as an amplifier. The vulnerability of the Cajon Pass is heightened by its role as a dense transportation and utility corridor. The area contains essential railways, highways, power lines, fiber optic cables, and water and gas pipelines, with approximately 160,000 vehicles passing through daily. Experts warn that a major seismic event could cause widespread disruptions to supply chains, communications, and energy systems, with some models projecting damages as high as $200 billion.

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