def _get_fault_type_dummy_variables(self, rup):
        """
        Fault type (Strike-slip, Normal, Thrust/reverse) is
        derived from rake angle.
        Rakes angles within 30 of horizontal are strike-slip,
        angles from 30 to 150 are reverse, and angles from
        -30 to -150 are normal.
        Note that the 'Unspecified' case is not considered,
        because rake is always given.
        """
        U, SS, NS, RS = 0, 0, 0, 0
        if np.abs(rup.rake) <= 30.0 or (180.0 - np.abs(rup.rake)) <= 30.0:
            # strike-slip
            SS = 1
        elif rup.rake > 30.0 and rup.rake < 150.0:
            # reverse
            RS = 1
        else:
            # normal
            NS = 1
        return U, SS, NS, RS