The "Earthquake" frame serves to input earthquake parameters. Directions of input earthquake effects are displayed on the desktop.
For the reason of successful converged analysis it is necessary to define an area, where the slip surface is predicted. In this area the horizontal and vertical acceleration acts on all finite elements (see picture). The finite elements outside this area are not affected by the earthquake. This area should not touch the edges of the task, otherwise analysis does not have to find a solution.
The frame contains a table with a list of entered points. Input of regions is identical to standard input of interfaces.
If not provided by measurements, the coefficients kh and kv can be calculated following the approach adopted from EN 1998-5.