Earthquakes produce seismic waves, which travel through Earth. Primary waves, or P-waves, are longitudinal. They can travel through both solids and liquids. Secondary waves, or S-waves, are transverse. They can travel through solids only. P-waves travel at approximately 8.0 km/s, and S-waves travel at approximately 4.5 km/s. Following an earthquake, vibrations are recorded at seismological stations around the world

Earthquakes produce seismic waves, which travel through Earth. Primary waves, or P-waves, are longitudinal. They can travel through both solids and liquids. Secondary waves, or S-waves, are transverse. They can travel through solids only. P-waves travel at approximately 8.0 km/s, and S-waves travel at approximately 4.5 km/s. Following an earthquake, vibrations are recorded at seismological stations around the world