Seismologists with the U.S. Geological Survey say they received a warning four seconds before an earthquake hit Southern California on March 28, according to the New York Times. It came from an early warning system the agency is testing.
The magnitude of the quake was 5.1 on the Richter scale. Scientists at the USGS said its strength is typical for the quake-prone area, but noted at a press conference that reports were still coming in from several monitoring sites.
The shaking interrupted major public attractions in Southern California, with a brief pause in rides at Disneyland. The quake was also felt by fans at Dodger Stadium.
In days following the quake, 38 or more aftershocks have occurred.