San Andreas and San Jacinto fault systems in ‘critically loaded state’, increasing chance of ‘big one’ quake in future

Southern California’s San Andreas and San Jacinto fault systems are at their highest levels of tectonic stress in 1,000 years in what scientists describe as a “critically loaded state”, according to a study published earlier this month.

“Our results show that stress levels on multiple fault segments are now at or above the highest values seen in the past millennium and that the region may be capable of a large through-going rupture involving both fault systems,” Liliane Burkhard, the lead author of the study published in the Journal of Geophysical Research: Solid Earth, said in a statement.