The effect of earthquake motion propagation being greater in the direction of the rupture(noun)
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Use "directivity" in a sentence
"However, they typically do not have a flat frequency response, that is, the directivity pattern is narrowed at the cost of the quality of the recorded sound."
"Assuming that direction may have occurred, the fact of direction adds nothing to the qualities or possibilities of existence, any more than the "directivity" of a chemist adds to the possibilities of certain elements when he brings them into combination."
"The Martian considers the theistic argument that it would be impossible to have an orderly universe merely resulting from the inherent properties of natural forces, and that "directivity" is necessary to keep the universe on its present track."