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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.
In this case, the earthquake event is called a slip. There are a number of different types of faults, but most can be divided into three categories: strike-slip faults, normal faults, and thrust faults. Image: Fault types.