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A model for the asteroid resurfacing by regolith convection is built toestimate its timescale. In the model, regolith convection is driven by theimpact-induced global seismic shaking. The model consists of three steps: (i)intermittent impact of meteoroids, (ii) impact-induced global vibration(seismic shaking), and (iii) vibration-induced regolith convection. In order toassess the feasibility of the resurfacing process driven by regolithconvection, we estimate the resurfacing timescale as a function of the size ofa target asteroid. In the estimate, a set of parameter values is assumed on thebasis of previous works. However, some of them (e.g., seismic quality factor$Q$, seismic efficiency $\eta$, and seismic frequency $f$) are very uncertain.Although these parameter values might depend on asteroid size, we employ thestandard values to estimate the representative behavior. To clarify theparameter dependences, we develop an approximated scaling form for theresurfacing timescale. According to the estimated result, we find that theregolith-convection-based resurfacing timescale is shorter than the meancollisional lifetime in most of the parameter uncertainty ranges. Theseparameter ranges are within those reported by previous works for smallasteroids. This means that the regolith convection can be a possible mechanismfor the asteroid resurfacing process.

Timescale of asteroid resurfacing by regolith convection resulting from the impact-induced global seismic shaking