In order to assess oceanic influence on the excitation of the Earth's seasonal wobble, which is not totally explained by atmospheric angular momentum (AAM) we employed Pacific Ocean monthly analysis data from the U.S. National Center for Environmental Prediction for the period from 1980 to 1994 to compute the Pacific Ocean angular momentum (POAM) around two axes on the equatorial plane. These were &khgr;1 and &khgr;2 with respect to axis 1 and axis 2 which corresponded to motion along the Greenwich meridian and 90 ¿E, respectively. In particular, we paid attention to the &khgr;1 component, which was barely influenced by AAM. The variance in the AAM plus POAM &khgr;1 was almost 10 times that of the AAM alone, while that of AAM plus POAM &khgr;2 decreased to ~60% of that of AAM alone. Thus the mean seasonal cycle of POAM plus AAM roughly accounted for the observed wobble, and its year-to-year fluctuations overlapped with those of seasonal wobble excitation. We also found that the seasonal &khgr;1 POAM mostly consisted of the motion (current) term and that the mass term played a secondary role; this is in contrast to AAM's contribution to &khgr;2. Although intensive seasonal fluctuations in the &khgr;1 motion term were localized around the western Pacific region, we found that middle-to-higher- and lower-latitude regions were inphase and out of phase with the basin-wide contribution. However, the influence of the Pacific Ocean may be reduced by other unaccounted for sources such as effects from other oceanic basins and land water. ¿ 1998 American Geophysical Union