New research from San Jose State University indicates that the San Andreas Fault, a major geological feature in California, has been moving at a faster and more consistent rate than previously understood. Scientists examining evidence in Sanborn County Park found that the fault has been slipping consistently over approximately the last 10,000 years, rather than showing a pattern of slowing down.
"The rate is similar to the rate that we get for the San Andreas Fault to the north in the north coast section," said SJSU professor Kim Blisniuk. "But prior to the work that my colleagues and I did at Sanborn County Park, the rate appears to not decrease along the San Andreas Fault, but it appears to be constant over this 10,000-year window that we were able to document."
The implications of a faster, consistent slip rate are significant, as faults that move more rapidly can potentially generate more frequent earthquakes. California is already acutely aware of the San Andreas Fault's seismic capabilities, with historical events like the 1906 San Francisco earthquake and the 1989 Loma Prieta earthquake occurring along its zone.
"So we do have historical earthquakes along this fault, and we will have them in the future," Blisniuk stated. She emphasized that living on a major plate boundary means earthquakes are an expected occurrence, and preparedness is crucial.
Blisniuk likened earthquake preparedness to having insurance, suggesting that having an earthquake preparedness kit is essential for managing the impact of potential disasters. "We always want auto insurance. We buy auto insurance, home insurance. We never want to use it, but it’s there for us," she said. "And so, having an earthquake preparedness kit to prepare us for a potential disaster when an earthquake occurs will really help us deal with the trauma of having an earthquake."
It is important to note that these findings have not yet been published or undergone peer review. However, Blisniuk indicated that the research provides further impetus for Californians to prepare for seismic activity.
The recent discovery follows a magnitude 3.9 earthquake that rattled Oakland's Hayward Fault just a week prior. Furthermore, recent studies have indicated that the southern section of the San Andreas Fault near Los Angeles is experiencing its highest stress levels in 1,000 years, adding to concerns about the region's seismic future.
