Warning times associated with some natural hazards can be measured in months (volcanoes), days (hurricanes), or minutes (tornadoes). Scientists in Japan have designed an earthquake warning system using an extensive network of seismographs. They use the arrival of P waves to trigger an alarm that can stop high-speed trains before the arrival of the more damaging S waves and the later surface waves. How would such a system affect citizens in a densely populated city such as Los Angeles that is situated near numerous active faults?
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