The sliding surface was a layer of hardness 5 with an icy surface; on top of it lies a very loose layer approx. 3cm thick, on which the 35cm thick layer from the last snowfall (quite a lot of wind-drifted snow) of hardness 2 (4 fingers) lies.
Slopes that have not yet released, with roughly the same aspect, altitude and steepness, are certainly still prone to triggering!