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A ground/earth fault is a fault where part of the current returns back through a path other than the opposing hot or, more critically, neutral. A neutral/earth fault is dangerous because the circuit will continue to function normally, but the hot and neutral leg currents are imbalanced, and the chassis can become energized.
I think the answer is normal faults, but I am not positive. I just know that compression causes reverse faults. A reverse fault will occur. Compression cannot produce normal faults. A normal fault is a  geological fault that has a hanging wall that has moved downward  relative to the footwall.