Figure 6

(a) View of an extensive streamlined mesa forming the base of Wahoo crater in Chryse Planitia (Wahoo crater is identified in Fig.1a). The dashed white lines demark channeled slopes facing towards the northern plains. These are mostly not connected upstream to outflow channels. (b) Close-up view on panel (a) showing some of the channels (dashed white lines). The elevation profile S-S' along one of the channels shows a ~ 140 m relief gain ~ over 20 km (~ 0.4°). Panels (a,b) Color MOLA DEM (460 m per pixel, credit: MOLA Science Team, MSS, JPL, NASA) over a THEMIS daytime IR global layer (http://www.mars.asu.edu/data/, 100 m per pixel, credit: Christensen, et al.⁷). (c,d) Parts of simulation in Fig. 5 showing WG movie 1, timesteps 3.4 and 6.4 h. During the time interval, the megatsunami recedes from the Wahoo crater's northern margin. The predicted backwash happens where the noted channels occur. We produced this figure using Esri's ArcGIS 10.3 (http://www.esri.com/software/arcgis).