H.-G. Kahle E. Klingele R. B. Smith Charles M. Meertens D. Dzurisin F. Arnet 1997 <div class=""><div class="article-section__content en main"><p>This paper describes the longest record of gravity measurements in the area of the Yellowstone caldera, Wyoming. The temporal gravity changes, at the ±12 µGal (10⁻⁸<span>&nbsp;</span>ms⁻²) precision level, are compared with changes in heights from leveling and GPS. The gravity field decreased across the caldera from 1977 to 1983 during the uplift and attained a maximum decrease of up to −60± 2 µGal along the Caldera axis. The gravity field then reversed polarity to increasing values, of up to 60±12 µGal between 1986 and 1993. The ratio between height and gravity changes varied during the entire time, but converged over the latter period following the free-air gravity gradient. General ground deformation deduced from leveling showed caldera-wide uplift of ∼15 mm/a during the period of gravity decrease, then from leveling and GPS, subsidence of ∼25 mm/a during the gravity increase.</p></div></div> application/pdf 10.1029/97GL02801 en American Geophysical Union Temporal gravity and height changes of the Yellowstone caldera, 1977 - 1994 article