When the deeper part of a subduction fault is locked, it generates a stress shadow along the shallow part of the fault that can be used to predict earthquake risk. Credit: Eric Lindsey

When the deeper part of a subduction fault is locked, it generates a stress shadow along the shallow part of the fault that can be used to predict earthquake risk. Credit: Eric Lindsey

When the deeper part of a subduction fault is locked, it generates a stress shadow along the shallow part of the fault that can be used to predict earthquake risk. Credit: Eric Lindsey

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