In the face of earthquakes, science is still promising. Through the study of seismic waves, it is found that seismic waves include P-waves and S-waves. The former propagates faster but has less destructive power, while the latter is the opposite. Therefore, through the seismic monitoring network, people monitor the P-waves of seismic waves with faster propagation speed and send signals to the monitoring center, The monitoring center can send an alarm to the public and key facilities by radio waves through the client. In other words, the earthquake alarm is a race between radio waves and seismic shear waves, which can warn people when the seismic shear waves have not yet arrived.
This passage is intended to explain that the accuracy and speed of earthquake warning systems need to be improved.