Is a measurement of displacement on the fault surface.

Fault slip is a measurement of displacement on the fault surface. The term fault slip comes from fault, which is a rock fracture where the two sides have been displaced relative to each other. 
When faults suddenly slip past one another the result is earthquake. The measurement of fault slip determines the seismic potential of faults.

Answer: the philippines has suffered from an inexhaustible number of deadly typhoons, earthquakes, volcano eruptions and other natural disasters. this is due to its location along the ring of fire, or typhoon belt – a large pacific ocean region where many of earth's volcanic eruptions and earthquakes occur.

The answer i think is d