Multiply reflected events in marine seismic data can be divided into two classes: Surface multiples are events that have at least one downward reflection from the water surface; and internal multiples, on the other hand, have all of their downward reflections at the water bottom or below. Surface multiples are usually stronger, more broadband, and more of a problem than internal multiples because the reflection coefficient at the water surface is much larger than the reflection coefficients found in the subsurface.
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Bill Dragoset (1999) studied this question.