Figure 18.

Delaunay triangulation of estimated regolith depth assuming that the base of the regolith is half way (mean) between the minimum regolith thickness (Figure 16) and the depth to the rock (Figure 17) based on the ejecta source depth of 30–60 m diameter fresh non‐RECs and RECs (Warner et al., 2017). The thickness of the regolith beneath the InSight lander (white X) is 3.3 m based on this determination. Latitude and longitude in planetocentric degrees; ellipse in white. Background is the THEMIS daytime mosaic in which dark halo craters have higher thermal inertia from rocky ejecta.