Three-dimensional gravity analysis has been carried out over the eastern intersection of the Menard transform with the Pacific-Antarctic East Pacific Rise at 49.8¿S. Typical of the East Pacific Rise (EPR), the residual mantle Bouguer anomalies are nearly constant (varying less than 5 mGal) along the 60 km of ridge axis surveyed. This uniform character of the residual mantle Bouguer anomalies suggests that this part of the EPR axis has a fairly uniform crustal/upper mantle structure. Although this observation is less constrained by the only three crossings along the ridge axis, it is consistent with observations elsewhere along the EPR. Significant features such as thinner crust are not suggested by the residual mantle Bouguer anomalies (RMBA) at the ridge-transform intersection or along the eastern 75 km of the Menard transform which is in marked contrast to what has been reported for the large gravity signatures at the slow spreading Mid-Atlantic Ridge. The lack of the positive RMBA at the intersection could be due to the dual effects of a relatively small thermal contrast across the intersection and the excess lavas from the overshot ridge. At the ridge-transform intersection, fresh lavas from the observed overshot ridge have filled in the transform valley and have subsequently thickened the crust from above, possibly compensating the effect of any thinner crust there. A large active seamount is present near the inside corner (about 40 km west of the ridge axis), and fresh lavas were observed surrounding the seafloor and between the seamount and the ridge. A large circular low in the residual mantle Bouguer anomalies surrounds the seamount, suggesting that both a thicker crust due to the active volcanism and hotter, less dense material are the source of the gravity low. ¿ American Geophysical Union 1995