However, the 2010 quake occurred on a previously unknown fault.

Four metres (13 ft) of sideways movement has been measured between the two sides of the previously unknown fault.

Air and ground transportation in same area inoperative due to unknown electromechanical fault.

The earthquakes on Sunday revealed the existence of previously unknown faults.

The 2001 Gujarat earthquake was caused by movement on a previously unknown south-dipping fault, trending parallel to the inferred rift structures.

The earthquake, which occurred at a previously unknown offshore fault shook Niigata and neighbouring prefectures.

It is considered to be closed to detraction, the sin of revealing previously unknown faults or sins of another person to a third person.

The news that the quake originated with a previously unknown fault rocked the security that flows from our investment in scientific expertise.

Somebody digs a pool in Rome, lubricating an unknown fault: Two years later there's a major earthquake in Alaska.

The earthquake was caused by an unknown fault buried under the surface.