Azimuthal:

In well logging: pertaining to being focused in one direction.

An azimuthal, or azimuthally focused, measurement has one or more directions perpendicular to the surface of a logging tool from which it receives most of its signal.

Examples are the density, laterolog and microresistivity logs.

Recent applications include azimuthal density and gamma ray in lwd tools.

A nonazimuthal, or azimuthally symmetric measurement is one which measures equally in all directions around the tool.

Examples are the induction, propagation resistivity log and gamma ray.