ENGINEERING GEOLOGY/Geophysics 489 Figure (B) The use of two dimensional forward modelling to determine the feasibility of using the microgravity method to detect (A) Victorian water wells The size of the anomaly is 10 mGals, which, in the conditions prevalent on site (busy streets in London), would have been below the resolution of modern digital microgravity meters overlying an interface needs to be determined This is normally done directly through the use of core samples but can also be derived indirectly using geometric techniques such as curve-fitting on hyperbolic anomalies and common mid-point analysis The effective use of core samples requires that the data be accurately located Foundation Design Geophysical methods are routinely used to measure the engineering properties of soils and bedrock as an input to the design of foundation structures including piles These properties include but are not limited to soil resistivity, shear modulus, Poisson’s ratio, and percentage moisture content These properties are usually derived from measurements taken from the surface or from boreholes Methods for deriving low-strain elastic moduli include surface-wave seismics, seismic refraction, cross-hole seismics, seismic tomography (Figure 2), and sonic logging Wireline logging has been used to correlate stratigraphy between boreholes and provide a clearer definition of stratal boundaries and type In the