The West Coast ShakeAlert system, which includes California, Oregon, and Washington, is being developed by a United States Geological Survey (USGS) led team with the goal of integrating and expanding the regional seismic networks that are part of the Advanced National Seismic System (ANSS),  the California Integrated Seismic Network (CISN), and the Pacific Northwest Seismic Network (PNSN). The USGS is also upgrading the processing software and computers to improve accuracy of the system and speed up response time to warnings. This West Coast-wide system has been designed for reliable operations and includes distributed servers with automatic system recovery. It has been sending alerts to early business users in California since early 2012.

There has been both federal and state funding to support the complete rollout, however the full sensor network has not yet been deployed and system is not fully funded for operations. In anticipation of the full system rollout, the California legislature passed SB 438 in 2016 which created the governance structure for implementation. This work, which is being supervised by CalOES, includes the governance and needed cooperative activities of all participants in all aspects of the EEWS, including system operations and public notification. CalOES will work with the USGS to operate the ShakeAlert system and issue public notifications under collaborative authorities with FEMA, as part of the National Earthquake Hazard Reduction Program.  Trials of the notification service are expected in 2018.