This diagram shows how such an earthquake early warning system would operate. When an earthquake occurs, both compressional (P) waves and transverse (S) waves radiate outward from the epicenter. The P wave, which travels fastest, trips sensors placed in the landscape, transmitting data to a ShakeAlert processing center where the location, size, and estimated shaking of the earthquake are determined. If the earthquake meets certain criteria, a message is issued by the USGS, which is picked up by partner organizations that produce alerts. Credit: USGS image created by Erin Burkett (USGS) and Jeff Goertzen (Orange County Register) and updated by Robert de Groot (USGS), public domain

This diagram shows how such an earthquake early warning system would operate. When an earthquake occurs, both compressional (P) waves and transverse (S) waves radiate outward from the epicenter. The P wave, which travels fastest, trips sensors placed in the landscape, transmitting data to a ShakeAlert processing center where the location, size, and estimated shaking of the earthquake are determined. If the earthquake meets certain criteria, a message is issued by the USGS, which is picked up by partner organizations that produce alerts. Credit: USGS image created by Erin Burkett (USGS) and Jeff Goertzen (Orange County Register) and updated by Robert de Groot (USGS), public domain

This diagram shows how such an earthquake early warning system would operate. When an earthquake occurs, both compressional (P) waves and transverse (S) waves radiate outward from the epicenter. The P wave, which travels fastest, trips sensors placed in the landscape, transmitting data to a ShakeAlert processing center where the location, size, and estimated shaking of the earthquake are determined. If the earthquake meets certain criteria, a message is issued by the USGS, which is picked up by partner organizations that produce alerts. Credit: USGS image created by Erin Burkett (USGS) and Jeff Goertzen (Orange County Register) and updated by Robert de Groot (USGS), public domain

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