Data from approximately 900 seismic stations contribute to ShakeAlert as of January 2019, with 600 stations in California. The planned density is for 1,675 seismic stations, as allowed by funding. Credit: ShakeAlert: https://www.shakealert.org/

Data from approximately 900 seismic stations contribute to ShakeAlert as of January 2019, with 600 stations in California. The planned density is for 1,675 seismic stations, as allowed by funding. Credit: ShakeAlert: https://www.shakealert.org/

Data from approximately 900 seismic stations contribute to ShakeAlert as of January 2019, with 600 stations in California. The planned density is for 1,675 seismic stations, as allowed by funding. Credit: ShakeAlert: https://www.shakealert.org/

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