Stress levels beneath Southern California’s two most dangerous fault systems have climbed to their highest in at least 1,000 years, prompting fresh concerns that the long-feared “Big One” may be drawing closer. The alarming findings come from a new study from AGU Journal examining the San Andreas and San Jacinto fault systems, in which researchers found that tectonic stress has reached levels not seen in a millennium. Scientists can’t predict when a major earthquake will happen; however, the