More than a million tiny earthquakes revealed in Southern California
Abundant data on little quakes can help scientists learn more about what triggers the big ones
![Baja California, Mexico](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/04/041819_CG_tiny-quakes_feat.jpg?fit=860%2C460&ssl=1)
COUNTING QUAKES The magnitude 7.2 El Mayor-Cucapah earthquake triggered numerous aftershocks across much of Southern California when it struck Baja California, Mexico, in 2010. A new study has identified more than a million tiny quakes recorded by seismometers in the region from 2008 to 2017, including hundreds of previously unnoticed aftershocks from the 2010 quake.
Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE)