What is defined as a coal or rock outburst that disrupts mining activities for more than one hour?

The correct choice for the scenario described is "Incident." In mining terminology, an "incident" refers specifically to an occurrence that disrupts normal operations, such as a coal or rock outburst, particularly when it causes a disruption lasting more than one hour. This definition encompasses a variety of situations that might affect safety or productivity, yet does not rise to the level of more severe classifications like accidents or disasters which typically imply a greater degree of harm or damage.

"Accident" generally refers to an event that results in injury or damage, which may not accurately represent cases where disruptions occur without necessarily causing immediate harm. "Disaster," on the other hand, often refers to large-scale events with significant consequences and loss, whereas "event" is a broader term that might describe any occurrence but lacks the specific implications tied to disruption and mining operations.

Thus, in this context, "incident" is the most fitting term to describe a coal or rock outburst that significantly interrupts mining activities.