Figure 4
Detailed view of geotechnical-related signals in the piedmont of Sierra de Santa Catarina and semi-variogram of the original InSAR-derived velocities. (a) Original InSAR velocity map with the geotechnical zones boundaries (location in Fig. 2a,b). (b) Intermediate-wavelength component overlaid by official geotechnical zones boundaries and modifications proposed in this work (dotted black lines). (c) Intermediate-wavelength component (same as in b) overlaid by cracks/faults locations identified and surveyed by the city’s government9. (d) Re-interpreted geological section along Calle 11-Zapotitlán Metro stations transect41,42 (brown polyline in a–c). Red vertical lines correspond to the locations marked in (c). Vertical grey solid and dashed lines indicate zero-crossings of (f) that coincide with changes in the geometry of the subsurface units of (d). (e) Velocity profile from Calle 11 to Zapotitlán showing original InSAR-derived velocities from (a) (black dots) and the long-wavelength component velocities (blue dots). (f) Intermediate-wavelength component velocities extracted from (b). (g) Regional semi-variogram calculated from Fig. 1f, and detailed view of the first 800 m (h). ArcMap 10.2 (https://www.esri.com/software/arcgis) and Matlab R2015b (https://www.mathworks.com) were used to compose the figures. ArcMap 10.2 was used to produce the shaded relief map from SRTM data (https://earthexplorer.usgs.gov).
