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.
Surface waves are seismic waves that are guided along the surface of the Earth and the layers near the surface. These waves do not penetrate the deep interior of the earth, and are normally generated by shallow earthquakes (nuclear explosions do not generate these surface waves).