The vertical arrangement of soil horizons down to the parent material or to bedrock Commonly subdivided into A, B, and C horizons Source (1) The geologic structure that generates a particular earthquake (2) The explosion used to generate acoustic or seismic waves Source function The ground motion generated at the fault during rupture, usually as predicted by a theoretical model and represented by a time history or spectrum The terms Brune spectrum, Aki spectrum, and Haskel model refer to varying representations of the source function, each based on different assumptions, as devised by the scientist for which the model is named
A vertical cross-section of soil layers constitutes the soil profile, which is composed of three major layers designated, A, B, and C horizons The A and B horizons are layers that have been modified by weathering, while the C horizon is unaltered by soil-forming processes
A vertical section of the earth's highly weathered upper surface often showing several distinct layers, or horizons