What geological feature is the result of earthquake activity causing a steep slope but is not visible in slip surfaces?

The geological feature resulting from earthquake activity that causes a steep slope but is not visible in slip surfaces is a fault scarp. A fault scarp is a linear topographic feature formed when there is a displacement along a fault line, typically resulting in a steep slope or cliff where one side of the fault is lifted relative to the other. It is important to note that fault scarps are often the most recognizable expression of faulting and can indicate previous seismic activity and the amount of movement along a fault.

In contrast, the other options describe phenomena related to earthquakes but do not specifically correlate with the characteristics outlined in the question. A flow typically refers to the movement of sediments or materials, such as mudflows or lava flows, while ground shattering and ground lurching describe the effects of seismic waves and ground movement that may occur during an earthquake but do not specifically result in the creation of a distinct topographic feature like a fault scarp does. Thus, the fault scarp is the best answer as it directly relates to the formation of steep slopes due to seismic activity.