Temperature and fine-scale velocity structure were measured in vertical profiles extending from the sea surface down through the main thermocline near Oahu, Hawaii. From 10 to 20% of the upper water column contained small-scale velocity fluctuations, which were present in discrete vertical patches or events. The amount of activity was greatest within the thermocline. Typical velocity fluctuations within events ranging from 0.1 to 1.0 cm/s, vertical wavelengths ranging from 5.0 to 50 cm. There is correlation between the form of the velocity fluctuations and the surrounding thermal structure: larger-scale motions correspond with higher temperature gradients.