This month is the 8th anniversary of 311 Tsunami in Japan.
We can’t control the earthquake, but we could prevent the accident from happening.
Primary Wave and Secondary Wave are seismic waves, both are created by earthquake.
Normally, P-wave with smaller energy and faster speed will arrive earlier than S-wave, which contains stronger power with slower speed.
If we’re in the elevator when earthquake happens, the time between P-wave and S-wave will be the best chance for escaping.
The P-Wave & S-Wave Earthquake Sensor offered by JFI is definitely your best choice for life protection!