Large quakes produce shaking at a variety of frequencies. Some waves can travel hundreds of miles, and are amplified by local geological conditions.

A new paper explains how signals oscillating at complex-valued frequencies could transform sensing, imaging, and ...

Low-frequency theta and delta brain waves are associated with relaxation and deep sleep. Binaural beats could help you sleep better by creating shifts toward theta and delta-type brain waves.

A sound wave is a vibration that travels through a solid, liquid or gas such as the air or water. A loud sound has a large amplitude, a high pitched sound has a high frequency. Musicians and ...