The CLR structure type defines sesimological velocity models in terms of piecewise continuous polynomials, as known from standard models like PREM (Dziewonski & Anderson, 1981). Within the TTBOX context it is mainly the internal rpresentation of .clr files, which are a storage format for such models. CLR structures are currently not used for computation.
Layer information is stored as coefficients of layer polynomials. For details on the evaluation of these polynomials, see the section on the .clr format.
Its field can be divided into the following groups:
Field | Type | Units | Description |
---|---|---|---|
name | string | - | model name |
year | numeric | - | Year of model publication |
planet | string | - | Name of planet for which model is valid. |
rp | numeric | km | Radius of planet for which model is valid. |
tag | string | - | A user-defined tag with no special meaning. The user may use this as he likes. Or She. |
Layer information is represented in one field which contains the number of continuously defined layers an the layers-substructure
Field | Type | Units | Description |
---|---|---|---|
lyrcnt | numeric | counter | Number of Layers in model. |
layers | structure | - | layers is an array of structures. Each layer has its own structure, containing the coefficients of all layer polynomials. The sequence of layers does not neccessarily correspond to the layer sequence in depth: layers(i) is not neccessarily the i-th layer from the surface or from the planets center. Depths are given by depth data only! |
Field | Type | Units | Description |
---|---|---|---|
name | string | - | name of layer (may be empty) |
depth | numeric 2-element vector | km | min(depth) is the depth to the top of the layer, measured from the surface. max(depth) is the depth of its bottom. |
vp | numeric n-element vector | km/s | P wave velocity layer polynomial coefficients. The first element is the constant term, the last element is coefficient of the highest power. A correct interpretation of the polynomial results in a velocity in km/s. The degree of the polynomial is implied by the number of coefficients. |
vs | numeric n-element vector | km/s | S wave velocity layer polynomial coefficients. The first element is the constant term, the last element is coefficient of the highest power. A correct interpretation of the polynomial results in a velocity in km/s. The degree of the polynomial is implied by the number of coefficients. |
rho | numeric n-element vector | g/cm3 | Density layer polynomial coefficients. The first element is the constant term, the last element is coefficient of the highest power. A correct interpretation of the polynomial results in a density in g/cm3. The degree of the polynomial is implied by the number of coefficients. |
qp | numeric n-element vector | - | P wave Q-factor layer polynomial coefficients. The first element is the constant term, the last element is coefficient of the highest power. A correct interpretation of the polynomial results in a dimensionless Qp factor. The degree of the polynomial is implied by the number of coefficients. |
qs | numeric n-element vector | - | S wave Q-factor layer polynomial coefficients. The first element is the constant term, the last element is coefficient of the highest power. A correct interpretation of the polynomial results in a dimensionless Qs factor. The degree of the polynomial is implied by the number of coefficients. |
Field | Type | Units | Description |
---|---|---|---|
conr | numeric scalar | km | Depth to Conrad Discontinuity. Must be NaN if not specified. |
moho | numeric scalar | km | Depth to Mohorovicic Discontinuity. Must be NaN if not specified. |
d410 | numeric scalar | km | Depth to Olivine-α - β-spinel phase transition. Must be NaN if not specified. This is named after the mean depth on earth in order to get a short name. |
d520 | numeric scalar | km | Depth to β-spinel-&gamma-spinel phase transition. Must be NaN if not specified. This is named after the mean depth on earth in order to get a short name. |
d660 | numeric scalar | km | Depth to &gamma-spinel-Perovskite Boundary. Must be NaN if not specified. This is named after the mean depth on earth in order to get a short name. |
cmb | numeric scalar | km | Depth to the Core-Mantle-Boundary. Must be NaN if not specified. |
icb | numeric scalar | km | Depth to the Core-Mantle-Boundary. Must be NaN if not specified. |
dz | numeric vector | km | Depths of non-standard discontinuites. Must be empty if none specified. |
dname | string matrix | - | Names of non-standard discontinuities. dname(i,:) is the name string for the i-th non-standard discontinuity, the depth of which is given in dz(i). Must be empty if none specified. |