Earthquakes: Progress Made to Implement Early Warning System, but Actions Needed to Improve Program Management, Report to Congressional Committees [open pdf - 3MB]
From the Highlights: "Earthquakes and related hazards are a significant threat to people and infrastructure in the U.S. For instance, magnitude 6.4 and 7.1 earthquakes centered west of Searles Valley in California, struck in July 2019, causing over $5 billion in damage. USGS [United States Geological Survey] is the lead federal agency for providing earthquake monitoring and notification. USGS began implementing ShakeAlert, its earthquake early warning system, in California, Oregon, and Washington State in 2012. GAO [Government Accountability Office] was asked to assess, among other things, USGS efforts to identify earthquake hazards. This report addresses, among other things, (1) USGS actions to identify earthquake hazards, (2) the extent USGS actions to achieve its earthquake hazard mission meet leading practices; and (3) what progress USGS and its partners have made implementing ShakeAlert. GAO evaluated agency guidance and other planning documents, such as USGS's ShakeAlert implementation plans; assessed its ShakeAlert cost estimate; conducted site visits to selected cities; and interviewed federal and state officials, among others."
Government Accountability Office: https://www.gao.gov/