burst and are usually associated with the onset of a magneto-hydrodynamic (MHD) ideal ballooning mode (IBM) instability when a threshold pressure gradient is reached in the steep edge pedestal of an H-mode plasma [17]. The possible role of an additional current driven instability (“peeling-ballooning mode”) for “Type I” ELMs has also received recent interest [20–22]. The ideal ballooning instability with nonlinear phases or aftermath has provided a paradigm for recent and current study of the ELM phenomenon theoretically. Explosive MHD instability and associated critical phenomena have been advanced analytically [14]. Early Braginskii fluid simulations were given in support of this [23]. Large, nonlinear MHD codes have been studying this in more detail, resolving several numerical problems and pay- ing specific attention to the details of the magnetic geometry, with mixed results on the phenomenology of the instability beyond its linear phase [24–28]. Whether or not the ideal ballooning instability or its peeling/ballooning variant is actually responsible for ELMs oc- curing in experiments (here noting the absence of a demonstrably well-resolved L-to-H mode transition in computations from first principles), the nonlinear phase of this “ideal MHD blowout” or “IBM blowout” phenomenon is of physical interest. The ability of the insta- bility to destroy the edge pedestal layer is undisputed, and the term “blowout” is germane. Typical physical parameters lead to a situation wherein the ideal MHD interchange growth rate is comparable to the parallel Alfv´ en transit time, one and the same with the basic ideal ballooning criterion. This is fast with respect to MHD but not to microturbulence. Provided they can simultaneously treat global MHD (i.e., the spectrum covers both global and ion gyroradius scales), edge-turbulence computations can also address the phenomenon and are even in a position to treat parts of it which fall outside the paradigm of the MHD model. Here we present nonlinear gyrofluid computations of IBM blowout events localised to the edge/SOL region of a tokamak plasma, resolved to below the ion gyroradius ρ$_{i}$ . As in the large MHD models the self-consistent evolution of the equilibrium is not only included but is also an integral part of the dependent variables. An electromagnetic 6-moment gyro- fluid model (“GEMR”) for both electrons and ions is used, including an energy-conserving treatment of finite ion Larmor radius effects and higher-moment terms which occur in the toroidal drift [29]. The energetic consistency is a key feature since the reaction of parts of the system such as flows and currents which have low energy content can play a central role in the indirect nature of nonlinear dynamics by serving as transfer channels. Although the 3