Attenuation

Decrease in amplitude of the seismic waves with distance due to geometric spreading, energy absorption and scattering.

The process where the flood crest is reduced as it progresses downstream.

A mechanism for controlling gene expression in prokaryotes that involves premature termination of transcription.

The reduction in level of sound.

Any process in which the flux density (power) of a beam of energy is dissipated.

Decrease in intensity of a signal, beam, or wave as a result of absorption and scattering out of the path of a detector by the propagating medium, but not including a decrease in intensity due to geometric spreading (e.g., the inverse square of distance).

The decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path to the detector, but not including the reduction due to geometric spreading. [After JP1] Note 1: Attenuation is usually expressed in dB. Note 2: "Attenuation" is often used as a misnomer for "attenuation coefficient," which is expressed in dB per kilometer. Note 3: A distinction must be made as to whether the attenuation is that of signal power or signal electric field strength.