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Continued deformation of the Long Valley caldera from the summer of 1983 to the summer of 1984 Is Indicated by resurveys of leveling and trilateration networks. The trilateration surveys can be explained by continued inflation (0.022 km ) of a spherical magma chamber located 10 km beneath the resurgent dome plus continued right-lateral slip on the uppermost 2 km of the 1983 rupture surface in the south moat of the caldera. The leveling data suggest a minor upwarping over the resurgent dome but are dominated by a regional tilt (0.9 yrad down to the southeast) over 60 km. Although the leveling data satisfy the usual routine tests for absence of systematic error (e.g., no correlation with topography, satisfactory loop closures, satisfactory agreement between the cumulative sums of backward and forward runs), we are unconvinced that the regional tilt is real. Unusual difficulty in obtaining satisfactory section closures in the double-run sections of the leveling is the primary basis for our skepticism.

Deformation of Long Valley Caldera, eastern California, 1983-1984