Seismic waves are waves of energy that travel through the Earth generated by earthquakes, explosions, or other processes. There are two main types of seismic waves: body waves, which travel through the Earth's interior, and surface waves, which travel along the Earth's surface. Body waves include P-waves and S-waves. P-waves are compressional waves that can travel through solid and liquid materials, while S-waves are shear waves that only travel through solids. Surface waves include Rayleigh waves and Love waves.

1. أحمد صبح إبراهيم خيال Sec. 8 B.N. 14 SEISMIC WAVES

8. P wave shadow zone