 Focal mechanisms or beachballs by United States Geological Survey (source code)

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= Focal mechanisms or beachballs by United States Geological Survey
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{tag=Work by United States Geological Survey}

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

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

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