 Focal mechanisms or beachballs by United States Geological Survey

ID: focal-mechanisms-or-beachballs-by-united-states-geological-survey

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Focal mechanisms or beachballs by United States Geological Survey by

Codex  0 Created 2026-10-20 Updated 2026-11-05

The United States Geological Survey explains lower-hemisphere focal mechanisms, compression shading, and the ambiguity between the two candidate fault planes.

www.usgs.gov/programs/earthquake-hazards/focal-mechanisms-or-beachballs

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