Παραδείγματα από το σώμα κειμένου για P wave
1. The signal is part of the primary wave, or P wave, that is the first, though least destructive, wave to arrive after a rupture.
2. Most people experience the P wave, which is a pressure wave that travels through rock like sound through air, as a jolt.
3. This P wave is followed by a secondary wave, or S wave, that shears the ground back and forth and up and down.
4. In the current study, Allen shows that the relationship between P wave frequency and the total magnitude of the quake holds for major quakes, up to magnitude 8 and higher, as well as for medium and small quakes.