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← GeographyWhich outcome results following significant foreshock activity before the main earthquake?
A)Increased seismic hazard assessment confidence
B)Reduced magnitude of induced ground motion
C)Decreased rupture propagation distance afterward
D)Elevated risk of mainshock rupture extent✓
💡 Explanation
Greater foreshock activity indicates increased tectonic stress accumulation, leading to an elevated risk of larger rupture extent due to the Cascade Effect, because initial ruptures weaken adjacent zones. Therefore, a larger mainshock becomes more likely, rather than a smaller one under these conditions.
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