Выражение встречается в следующем контексте: The second arrival
discussed previously appears as a very dispersive mode which starts near the
compressional slowness at low frequency, and goes to the mud slowness at high
frequency. This mode caused by the presence of the altered zone is called the Hybrid
Mode. It is a form of leaky mode which is linked to the presence of a radial slowness
profile in the formation.
Заранее спасибо