Translations:Layer-cake model/7/en

What are the limitations of a 1D synthetic seismogram? A 1D synthetic seismogram is the result of a single-channel convolution of a wavelet with a computed impulse response of a layer-cake medium. This impulse response can include either primary reflections only or multiples as well. Only vertical travel paths are used in this model. However, the layer-cake model can be varied in a lateral direction, and successive 1D synthetic traces can be displayed side by side to simulate a seismic section. Such a synthetic seismic section can be compared with an actual seismic section to help identify events and to see how variations in the model might appear on the synthetic section. Usually, the models assume that the source and receiver are coincident, and sometimes offset-dependent effects can be included. Some models include head waves, surface waves, and other wave modes. Calculation of a synthetic seismogram is a direct or forward problem, as opposed to the inverse problem, which produces estimates of the seismic wavelet along with the reflection coefficients characterizing layer interfaces and their depths in terms of their two-way traveltimes.