Figure 1
(A) Location of Brasilia on the map of Brazil, (B) position of Ribeirão Contagem watershed on the map of Brasilia, (C) The locations MASW (L1, L2, and L3) and ERT (ERT-1 and ERT-2) and E1 soil sampling profiles (P1-P13). Bottom left lithological information taken from a nearby groundwater well (modified after Hussain et al., 2019b). The dotted red line is the hypothetical landslide boundary. Red dots on yellow line show the length of seismic lines.
Figure 2
(a) Geomorphological units of the area, resulted from the soil sampling analysis along with cross-section E1 (Figure 1) showing (i) alluvium; (ii) colluvium; (iii) sandy point bars and (iv) a mass movement and (b) soil analysis results along profile E1. P1-12 are the soil sampling points (adopted from Braga et al., 2018).
Figure 6
Modeled resistivity tomograph of profile ERT-1 that was taken transverse to the Sobradinho landslide. The dotted lines show different features such as (A) hypothetical landslide boundary, (B) disturbed material on the top of a valley, (C) compacted clayey, and (D) a possible permeable path through which water can infiltrate because of proximity to a small seasonal stream. Color scale represents the values of resistivity in ohm.m.
Figure 7
Modeled resistivity tomograph of profile ERT-2 that was taken parallel to the Sobradinho landslide. The black dotted line shows the different features: (A) hypothetical landslide boundary, (B) compacted and dry landslide material might be labeled with previous landslide slip surface, (C) a continuous low resistivity material might be related with a possible permeable path through the water, whose water from the Contagem river percolates and (D) Saprolite with varying degree of weathered and moisture. Color scale represents values of resistivity in ohm.m.