The purpose of this bug is to define the concept of tectonic regionalisation in the MTK.
A tectonic region is defined by the following:
1) Region Type (string)
2) Region Identifier Code (string)
3) Magnitude scaling relation a model (or list of models) corresponding to one or more of the magnitude scaling relations supported by the nhlib.
4) Shear Modulus: a positive float (or list of positive floats) corresponding to the "shear modulus (in GPa [giga-pascals])" parameter for calculation.
5) Displacement Length Ratio: a positive float (or list of positive floats) corresponding to the "displacement to length ratio" needed for calculation.
Checks against tectonic region parameters:
i) A region type should correspond to one of the following common regions: active shallow crust, subduction interface, subduction intraslab, stable continental, volcanic. However, if the user wishes to define an original region typology, they will need to provide all of the information listed previously. Otherwise, an error will be raised.
ii) If the user provides a list of values in the fields: Magnitude scaling relation, shear modulus and/or displacement length ratio, they must supply a list of corresponding weights where each weight is a float in the range 0.0 to 1.0, and the sum of the list of weights must equal to 1.0.
An example is found in the following code (https://github.com/g-weatherill/gw_misc_code/blob/master/fault_calculator/new_fault_class.py)
Standard definitions of common tectonic regions will be provided.
