Introduction

This example considers the effect of shallow sedimentary deposits on the observed motions.  this effect is especially strong on the radial components, and hence will strongly influence the computed receiver function.

Example

Models

The following figure compares the two surface models.  The CUSMOD.mod is a typical upper crustal model, while the CUSEMB.mod has the upper 1 km replaced by low velocity sediment as a approximation to the velocity structure at Memphis, Tennessee.  The figures are

Velocity model comparison

Teleseismic P-wave Signal

The first run creates a broadband teleseismic signal for a 600 km deep source recorded at an arc distance of 50 degrees. This signal has the effect of the source model above the source, the geometrical spreading and attenuation of the teleseismic signal, and the effect of the receiver crust structure.

teleseismic signal

Receiver Structure Response

By using the -NOTEL -NOSRC command line flags, the effect of the sediment structure can be seen

Receiver structure response