We have completed a study of thermovibrational convection in a vertical, cylindrical cavity for Rayleigh numbers, Ra, of 0, 10(4) and 10(5), and vibrational Grashof numbers, Gr(v), of 10(5) and 10(6). Results indicate that vibrational convection greatly increases heat transfer rates over the unmodulated case-by 7-15% at Gr(v) = 10(5) and by 50-65% at Gr(v) = 10(6). The observed resonant frequencies seem to agree reasonably well with the predictions given by the resonance frequency expression derived by Fu and Shieh [Int. J. Heat Mass Transfer 35, 1695-1710 (1992)]. However, this equation has been modified to include the effect of a static gravitational component and this modified equation appears to give better results when Ra and Gr(v) are roughly comparable in magnitude.