Frequently Asked Questions About Compression, Compression Stockings, and Armsleeves. We're always glad to any questions you may have. If you need a quick answer, please use our Live Chat service, available from 9:00 a.m. to 6:00 p.m. Monday to Friday by clicking the Chat Now button to the left.
Seismic waves are waves of energy that travel through the Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy.
Seismic waves are elastic waves that propagate in solid or fluid materials. They can be divided into body waves that travel through the interior of the materials; surface waves that travel along surfaces or interfaces between materials; and normal modes, a form of standing wave. Body waves. There are two types of body waves, Pressure waves or Primary waves and Shear or Secondary waves . P-waves are longitudinal waves that involve compression and expansion in the direction that the wave is moving and are always the first waves to appear on a seismogram as they are the fastest moving waves through solids.