Interior of the Earth

Information about the interior comes from

Information about the interior comes from direct sources such as surface rocks, mining areas, deep drilling, and volcanic materials, and from indirect

The focus or hypocentre is

The focus or hypocentre is the point within the earth where energy is released during an earthquake. The epicentre is the point on the surface directl

P

P-waves are body waves that move fastest, arrive first at the surface, travel through gaseous, liquid, and solid materials, and vibrate parallel to th

S

S-waves are secondary body waves that arrive after P-waves, travel only through solid materials, and vibrate perpendicular to the direction of propaga

Surface waves are produced when body

Surface waves are produced when body waves interact with surface rocks. They move along the surface, arrive last on the seismograph, and are the most