Earthquakes have created some New Zealand waterfalls, often through the upthrust of rock along a fault. The Murchison earthquake of 1929 created the Maruia Falls by triggering a landslide which diverted the course of the Maruia River westwards, forcing it to cut a new channel over an old river bank. ... Immediately after the earthquake, the falls were only about a metre high, but after a year, the drop was 5 metres.
The floating debris swirling at the bottom of the falls also intrigued me.