Early earthquake warning systems typically use seismometers to detect incoming fast P-waves. When shaking is felt, a signal is sent to the local seismic authority, which rapidly sends out an alert to those in the region who are likely to feel shaking, hopefully before the more damaging S-waves arrive. Credit: NoPineapplesOnPizza (CC BY-SA 4.0)

Early earthquake warning systems typically use seismometers to detect incoming fast P-waves. When shaking is felt, a signal is sent to the local seismic authority, which rapidly sends out an alert to those in the region who are likely to feel shaking, hopefully before the more damaging S-waves arrive. Credit: NoPineapplesOnPizza (CC BY-SA 4.0)

Early earthquake warning systems typically use seismometers to detect incoming fast P-waves. When shaking is felt, a signal is sent to the local seismic authority, which rapidly sends out an alert to those in the region who are likely to feel shaking, hopefully before the more damaging S-waves arrive. Credit: NoPineapplesOnPizza (CC BY-SA 4.0)

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