California has experienced 10 times more earthquakes than previously known, according to groundbreaking new research that has helped scientists better understand the region’s seismology.
Spectators survey a parking structure at Cal State Northridge in 1994 after the magnitude 6.7 Northridge earthquake.
Scientists have long understood a key mathematical relationship in earthquake magnitudes: For each whole number drop in magnitude, there are 10 times as many earthquakes. For instance, for every magnitude 7 earthquake, there are 10 magnitude 6 temblors, 100 magnitude 5 shakers, 1,000 magnitude 4 events, and so forth.
This means a detectable earthquake, on average, occurs every 3 minutes in Southern California — much more frequent than the old estimate of one temblor every half-hour. Now, there’s evidence it actually increased earthquake activity that stretched as much as 170 miles away — reaching Riverside, San Bernardino and Palm Springs.
It showed how a swarm of earthquakes moved geographically. An animation of an earthquake swarm around the town of Cahuilla, Calif., that started in 2016 andshows how seismic activity gradually moved westward and became shallower, Ross said, probably triggered by the movement of groundwater. Being able to find foreshocks that precede larger quakes is particularly thrilling for scientists. Half of all large quakes are preceded by smaller foreshocks.
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