Measurements of deformation in and around the Long Valley caldera in the interval July 1983 to August 1984 indicate that deformation is proceeding at a roughly uniform rate and that the net deformation for the year is about the same as for the preceding year. The 1983--1984 deformation of the 40-line trilateration network can be approximated as the effect of the expansion (0.022 km3) of a spherical magma chamber located 10 km beneath the resurgent dome plus right-lateral slip (50 mm) on the uppermost 2 km of the 8.5-km-long 1983 rupture surface in the south moat of the caldera. This smae model furnishes an approximate fit to the tilting observed at six 1-km aperture bench mark arrays within the caldera, although the quantitative fit lies somewhat outside the estimated observational error. The model, though obviously too simple to furnish a detailed fit to the complex process of magma chamber reinflation, does furnish a reasonable overall picture of the deformation.