Based on the theoretical distinction between genuine, mediated and sta
ged events, the causes and consequences of waves of news coverage are
analysed. It is assumed that key events change the criteria for the se
lection of news and stimulate new activities which in turn get covered
by the media. It is further assumed that, as a consequence, the news
coverage creates the false impression of an increasing number of genui
ne events - occurrences which by definition cannot be influenced by me
dia coverage - even if their actual number remains unchanged. This is
due to the fact that the media report more often on past events, give
new events more coverage and make both appear very similar to the key
event. The theoretical assumptions are analysed with respect to covera
ge on AIDS, earthquakes and truck accidents before and after three key
events.