Crustal Deformation Monitoring
Geodetic methods are used to measure movement of the Earth’s surface and strain in the upper few hundred meters of the Earth’s crust. These data record subtle fault-related deformation of the Earth’s crust that does not generate seismic waves as well as the rapid motion that occurs during earthquakes. Geodetic measurements have applications for seismic hazard assessment, earthquake early warning, earthquake likelihood monitoring, and research into underlying physical processes
Velocities, time series, and maps for stations observed with GPS in the western U.S.
High-rate GPS networks in the San Francisco Bay Area and Long Valley.
Interactive maps and near real-time data from creep-meters, strain-meters, tilt-meters and other geophysical instruments.
Creep rate measurements on San Francisco Bay Region faults updated annually. The San Francisco State University Creep Project discusses fault creep in depth.
Results from measuring changes in distances using a two-color EDM. Measurements were made in Parkfield, Long Valley, and Southern California.
Results from measuring changes in distances using a single-color EDM. Measurements made throughout California from 1970 to 1994.
Long Valley, in eastern California, is the center of continuing volcanic activity and moderate earthquakes. Links to instrumental monitoring of geophysical activity in the area.
This page examines GPS along with creepmeter and strainmeter data that monitor deformation across the SF Bay region.