Focal mechanism

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What Wikipedia says

The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event, it refers to the orientation of the fault plane that slipped, and the slip vector and is also known as a fault-plane solution.

Excerpt from the Wikipedia article “Focal mechanism”, under the CC BY-SA 4.0 license. Read the article on Wikipedia