Earthquake warning systems
A) are based on long-term predictions of earthquakes,allowing planners to schedule evacuations.
B) alert people just before an earthquake takes place,allowing them to evacuate buildings.
C) alert people when an earthquake has taken place,possibly giving them seconds to get to a safer place.
D) do not yet exist,but the technology is something seismologists are working on.

Question

Quizplus · Accepted Answer

Earthquake warning systems currently in place are designed to alert people after an earthquake has taken place, providing them with a few seconds to seek safety before the seismic waves arrive. These systems use a variety of technologies, including sensors that detect ground motion and GPS data to estimate the location and magnitude of the earthquake. While some long-term earthquake prediction is possible, it is not yet accurate enough to allow for planned evacuations.

Earthquake Warning Systems