The so-called Mission Creek strand has greater tectonic movement than previously thought, according to US scientists.
The strand runs just beneath the Little San Bernardino Mountains, and was previously considered largely irrelevant to California’s earthquakes.
But, the heightened movement is crucial, as it relieves some of the stress on the Banning and Garnet Hill strands.
It’s believed that a Big One would largely result from an earthquake on the Banning or Garnet Hill strand. But, the revelation of Mission Creek’s movement means that a Big One is far less likely to happen.