The mechanisms responsible for vibrational motions of Arctic ice at frequencies below about 100 Hz are known to be a combination of wave types, namely, gravity waves, flexural waves, and a variety of acoustic and/or elastic waves. Surface motion measurements using geophones and accelerometers on multiyear pack ice are used to establish the energy level of these motions and to differentiate between the different modes of propagation. Gravity waves are dominant below about 0.05 Hz, with their direction and dispersion relation being confirmed with vector measurements of acceleration from two stations. Motions driven by surface pressure fluctuations in the local wind appear at somewhat higher frequencies up to about 0.3 Hz and are particularly evident on thinner first-year ice during periods of high wind. The band from 0.1 to 10 Hz comprises mainly flexural modes of propagation, with one or the other being dominant during specific environmental events. The probability density function of power in octave wide bands is approximately lognormal as a result of the high level of intermittence of local events. The variance in power level is significantly smaller for waterborne noise from more distant sources. Specific examples are used to illustrate the nature of the events. ¿ American Geophysical Union 1992