subsurface wave

subsurface wave

[¦səb′sər·fəs ′wāv]
(electromagnetism)
Electromagnetic wave propagated through water or land; operating frequencies for communications may be limited to approximately 35 kilohertz due to attenuation of high frequencies.
References in periodicals archive ?
That, in turn, enables those systems to detect an earthquake's primary wave in time to send out an alert before its damaging surface and subsurface waves arrive.