What is a cluster map?
In Earth Science, a cluster map shows earthquakes that are known to "cluster"
along some continental edges and chains of islands, particularly around the
Pacific "Ring of Fire." I hope that this answers your question.
If I understand correctly what you mean by the term "cluster map" it is a method of
visually associating some measurement or data with a map location. One might put a pin
or thumb tack or other mark on a map to locate where an observation or data were observed.
These are also called "data maps". You can see some brilliant examples in the book
"The Visual Display of Quantitative Information" by Edward R. Tufte. He has also published
several subsequent books along the same lines. Such maps are a very useful tool for
absorbing massive amounts of numerical data that depend upon locations.
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Update: June 2012