Southern California

The Southern California area is subject to thousands of earthquakes each year. In addition to the San Andreas Fault, there are over 200 other known faults that can produce magnitude 6 or greater earthquakes. A small network of strainmeters monitors the region in the central transverse ranges of this region. Locations of these sites and data plots of recent measurements are available on these pages.

Map of Instrument Sites

map key

Data Plots

Most instruments take measurements every 10 minutes. Plots are updated every 30 minutes.

Instrument Plots
Dilatometers Past 7 days Past 30 days Past 100 days

The plots and data on this page are generated automatically and have not been reviewed. They should not be used for engineering, legal, or any other critical applications.