Science - Explain "turbidity" where sediment material collects on an underwater shelf and is moved?

Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality.
Turbidity - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Turbidity

No direct reference to an earthquake there.