def get_probability_no_exceedance(self, poes):
        """
        Compute and return the probability that in the time span for which the
        rupture is defined, the rupture itself never generates a ground motion
        value higher than a given level at a given site.

        Such calculation is performed starting from the conditional probability
        that an occurrence of the current rupture is producing a ground motion
        value higher than the level of interest at the site of interest.
        The actual formula used for such calculation depends on the temporal
        occurrence model the rupture is associated with.
        The calculation can be performed for multiple intensity measure levels
        and multiple sites in a vectorized fashion.

        :param poes:
            2D numpy array containing conditional probabilities the the a
            rupture occurrence causes a ground shaking value exceeding a
            ground motion level at a site. First dimension represent sites,
            second dimension intensity measure levels. ``poes`` can be obtained
            calling the :meth:`method
            <openquake.hazardlib.gsim.base.GroundShakingIntensityModel.get_poes>
        """
        if numpy.isnan(self.occurrence_rate):  # nonparametric rupture
            # Uses the formula
            #
            #    ∑ p(k|T) * p(X<x|rup)^k
            #
            # where `p(k|T)` is the probability that the rupture occurs k times
            # in the time span `T`, `p(X<x|rup)` is the probability that a
            # rupture occurrence does not cause a ground motion exceedance, and
            # thesummation `∑` is done over the number of occurrences `k`.
            #
            # `p(k|T)` is given by the attribute probs_occur and
            # `p(X<x|rup)` is computed as ``1 - poes``.
            # Converting from 1d to 2d
            if len(poes.shape) == 1:
                poes = numpy.reshape(poes, (-1, len(poes)))
            p_kT = self.probs_occur
            prob_no_exceed = numpy.array(
                [v * ((1 - poes) ** i) for i, v in enumerate(p_kT)])
            prob_no_exceed = numpy.sum(prob_no_exceed, axis=0)
            prob_no_exceed[prob_no_exceed > 1.] = 1.  # sanity check
            prob_no_exceed[poes == 0.] = 1.  # avoid numeric issues
            return prob_no_exceed
        # parametric rupture
        tom = self.temporal_occurrence_model
        return tom.get_probability_no_exceedance(self.occurrence_rate, poes)
Compute and return the probability that in the time span for which the
        rupture is defined, the rupture itself never generates a ground motion
        value higher than a given level at a given site.

        Such calculation is performed starting from the conditional probability
        that an occurrence of the current rupture is producing a ground motion
        value higher than the level of interest at the site of interest.
        The actual formula used for such calculation depends on the temporal
        occurrence model the rupture is associated with.
        The calculation can be performed for multiple intensity measure levels
        and multiple sites in a vectorized fashion.

        :param poes:
            2D numpy array containing conditional probabilities the the a
            rupture occurrence causes a ground shaking value exceeding a
            ground motion level at a site. First dimension represent sites,
            second dimension intensity measure levels. ``poes`` can be obtained
            calling the :meth:`method
            <openquake.hazardlib.gsim.base.GroundShakingIntensityModel.get_poes>