SAN DIEGO >> California emergency officials say a period of elevated risk of a large earthquake on the San Andreas Fault is over.

The update today by the Governor’s Office of Emergency Services came a week after a series of small jolts under the Salton Sea in Southern California near the 800-mile-long fault.

The U.S. Geological Survey had said the swarm temporarily increased the risk of a bigger earthquake, but that risk quickly decreased over time. The largest quake in the swarm was a magnitude 4.3.

Earthquake swarms have occurred under the Salton Sea in the past.

The last time the southernmost section of the San Andreas Fault ruptured was in 1680, more than 330 years ago.

Scientists estimated the probability of a quake with a magnitude of 7.0 or higher on the southern San Andreas fault being triggered was as high as 1 in 100 and as low as 1 in 3,000. The average chance for such an earthquake striking on any given week is 1 in 6,000.

Gov. Jerry Brown signed legislation last week to develop a statewide warning system to inform Californians of impending earthquakes through their cellphones, radios and other devices.

“California is earthquake country,” said Mark Ghilarducci, the director of the state’s Office of Emergency Services. “We must always be prepared and not let our guard down.”