Figure 4
Results from the gravity geophysical survey at the NTU Geothermal site in Singapore. The values presented are relative to the mean relative value (with post-processing) at the base station. Corrections for tidal dynamics, free-air and Bouguer discrepancies51, and additional drift determined by the calibration measurements (see Fig. 3), have been applied. The gradiometry results are depicted via a heat map (a), as well as on a traditional Cartesian plot (b) with respect to the distance from the square marker depicted on the heat map. The results suggest a subterranean anomaly in proximity to the base station. This is further corroborated by the seismic reflectivity (c) observed by the seismology survey conducted in parallel50, whose sensor placements are shown on the heat map. Here, the gravitational minimum is marked by a red bar.
