def _get_mechanism(self, rup, coeffs):
        """
        Compute fifth term of equation (1) on p. 1200:

        ``b6 * H``
        """
        is_strike_slip = self.get_fault_type_dummy_variables(rup)
        return coeffs['b6']*is_strike_slip
Compute fifth term of equation (1) on p. 1200:

        ``b6 * H``