697K views · 10K reactions | Japan’s earthquake early warning system detects primary seismic waves (P-waves) using a nationwide network of seismometers. When detected, it instantly sends alerts via TV, radio, smartphones, and public systems. This provides a few seconds to a minute of warning before stronger secondary waves (S-waves) arrive, helping reduce injuries and damage. | Japan Daily | Facebook

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Seismic Audio SA-15T Speaker Cabinet

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