The CSN is a distributed system with the autonomous sensors sending their data via the Internet to a cloud-based analysis system that then distributes the results to users and archives the data.
The sensor package consists of the low-cost 3-axis MEMs accelerometer that is controlled by a Raspbery-Pi_3b micro-computer. The waveforms are sampled at 50 sps and are transmitted to the server every 10 minutes via the internet. The micro-computer also detects events and when an earthquake is found it sends the size and time immediately to the cloud. More sensor detail.
The data from the sensors is received by two streams. The waveforms are sent evey 10 minutes and are then archived on a server (currently ground-based). The pick or event-driven information is received whenever it occurs and is sent to the Earthquake Early Warning (EEW) facility. Maps of maximum acceleration (ground shaking) are produced and sent to first-responders. More server detail.
CSN is currently located in the northern Los Angeles region but plans to expand it to cover the entire Los Angles region. The system is easily deployed to other parts of the world. A map of the distribution is shown to the right. This also shows the Southern California Seismic Network (SCSN) station in the Los Angeles region.
The CSN sensors are largely hosted by volunteers. The sensors, although they are decimated to prevent recording human voices, can detect events such a door closing, elevators moving, etc, which are not part of our mission. To protect the privacy of our hosts, we do not distribute waveform data unless there is an interesting earthquake. Data that are available are shown here.