What term describes the area where an earthquake has occurred along a fault line?

The term that best describes the area where an earthquake has occurred along a fault line is "Earthquake Epicenter." This refers specifically to the point on the Earth's surface directly above where the earthquake originates, or the focus. The epicenter is the location from which seismic waves radiate outward during an earthquake. It is crucial for understanding the geographical impact of the event, as seismic waves tend to be strongest near the epicenter.

The other options, while related to seismic activity, do not accurately define the specific location of an earthquake's origin. For example, a "Seismic Zone" refers to a region characterized by a higher likelihood of experiencing earthquakes due to geological features, rather than pinpointing a specific event. A "Fault Plane" pertains to the surface along which the rock has broken and slipped, which is more related to the mechanics of the fault rather than the location of a specific earthquake. "Seismic Source" denotes the origin point of seismic waves but is a more general term and does not necessarily indicate the surface location of an earthquake like the epicenter does.