How large a wave/disturbance would it generate?
The wave/disturbance would be nonexistent. As above, there just isnt enough mass, even in later, larger, ribbons, to generate such energy dispersion. There might be a small amount of light as a line in the sky as the ribbon burns up but after that it will be a few pieces of black film fluttering to Earth. Because of the size, distribution and winds, it is conceivable that only a few people would even see the event in any way and just as few would find actual pieces of the ribbon. How much warning would there be from the time of a break and the time it would take for the lower portion to splash down? Depending on exactly what happened it could be a few hours to weeks. What would happen to the surviving portion? The ribbon that fell to Earth could be recovered for study but because of the amount and distribution it would be difficult to find many pieces. The pieces that do land would eventually degrade but not for a very long time. Keep in mind that this is mostly a stable form of carbon
