Providing a transform function to produce a mechanical property of a subterranean structure

A transform function is useable to map a characteristic (e.g., acoustic impedance, shear impedance, density, and/or other characteristic) to a mechanical property (e.g., Young's modulus or other mechanical property). Values of the characteristic can be derived based on surface survey data, and such values can be mapped to respective values of the mechanical property using the transform function.