Final answer:
Talus, consisting of rock debris, naturally migrates downslope due to gravity. This process is gradual and can be influenced by various factors such as weathering and erosion, not solely by seismic events.
Step-by-step explanation:
With the passage of time, all talus migrates downslope. Talus, also known as scree, consists of the accumulated debris from rockfalls and landslides which naturally move downslope due to gravity. The process of talus migration is gradual, influenced by weathering, erosion, and the downslope pull of gravity. It does not typically move upslope, very quickly, or only during earthquakes although seismic events can certainly trigger movements.
The term you've provided that describes the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate is subduction, which is different from the process being asked about in the question, which pertains to talus.