This site is updated automatically as new data is sent to the USGS Western Region Headquarters via satellite and processed for the website. Follow the links below to learn about how we do this:

Downloading Data:

Guide to Downloading Raw Data
How to download raw USGS data from UC Berkeley's NCEDC.

Other Topics:

Data Acquisition
An explanation of the telemetry systems used to collect the raw data from instruments in the field.

Data Cleaning
An explanation of the cleaning routines that prepare the raw data for analysis and plotting on the web.

Plotting the Data
An explanation of how the data plots are created.

Timing the Data
An explanation of the timing of data samples.