2D elastic modelling
In the elastic case four different representations for the modelling results are given. From left to right pressure, shear, horizontal and vertical displacement amplitude are given.
enlarged animation (~ 2.3 MB)
The source is of explosive type with a Gaussian spatial distribution which only generates P-waves. At the interface waves are partly reflected and partly transmitted into the lower layer. At this interface mode conversion from P- to S-waves take place. Note the diffracted energy from the corners of the step in the snapshots. These diffractions can also be seen in the later part of the seismogram. The event at the far right side at late times is due to a headwave.
Kosloff, D., Filho, A.Q., Tessmer, E., Behle, A., 1989,
Numerical Solution of the Acoustic and Elastic Wave Equations by a New Rapid Expansion Method,
Geophys. Prospecting, Vol. 37, 383 - 394.