.clr file format

Definition of Discontinuities

A named discontinuity is declared by the discon Keyword.

Assigning a name is useful in order to evaluate seismic phase names of in which these discontinuities are referred. In order to compute a PcP travel time, for example, you need to know where the core mantle boundary is.

A discontinuity declaration looks like this:

!discon !depth 2890 outer core

This line declares the core-mantle boundary to be at 2890km depth.

Instead of depth, it is also possible to use the radius:

!discon !radius 3481 outer core

defines the same core mantle boundary (if the radius is 6371km).

There are predefined names for standard discontinuities which should be used properly.

Discontinuity declarations may be grouped somewhere in the .clr file, or may be given between the declaration of the layers they separate - just as you like.

If there are multiple discontinuity declarations for the same position (irrespective of using depth or radius coordinates), the last one will override all previous ones.


eof.