Post #1007730: When an earthquake occurs, seismologists create…
When an earthquake occurs, seismologists create graphics of focal mechanisms, informally referred to as beach balls, to show the faulting motions that produce the earthquake.  The focal mechanisms are based on the direction of the first arriving P wave.

When an earthquake occurs, seismologists create graphics of focal mechanisms, informally referred to as beach balls, to show the faulting motions that produce the earthquake. The focal mechanisms are based on the direction of the first arriving P wave.

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