Between 2008 and 2017, Southern California was hit by 1.eight million earthquakes, 10 occasions greater than beforehand thought, mentioned a brand new examine.
Seismologists on the California Institute of Expertise discovered roughly 180,000 earthquakes had been recorded throughout that point.
Knowledge confirmed the area experiences 495 quakes a day or roughly one every three minutes. Nonetheless, the rationale these quakes are only being found is that they’re too small to note.
“It isn’t that we did not know these small earthquakes had been occurring,” stated Zachary Ross, lead creator of the examine who will be a part of Caltech’s school in June as an assistant professor of geophysics, in a statement. “The issue is that they are often very troublesome to identify amid all the noise.”
The examine was published Thursday in the peer-reviewed journal Science.
Researchers say the earthquakes are powerful to seek out as a result of seismic knowledge additionally contains background noise reminiscent of constructing the building and shaking from site visitors.
To search out the quakes, seismologists used a method referred to as “template matching,” the place a simply-identifiable earthquake sign is used as a template to seek out matching information indicating an earthquake. Researchers additionally used an array of highly effective computer systems to scan the earthquake catalog and confirm the brand new shocks.
Scientists mentioned many of the smaller earthquakes discovered have been between destructive magnitude 2.0 and 1.7.
In a press release, Michael Gurnis, director of the seismological laboratory and geophysics professor at Caltech, stated the examine “has opened a brand new window permitting us to see thousands of beforehand unseen earthquakes and this modification our potential to characterize what occurs earlier than and after massive earthquakes.”