Anthropocene Isostatic Adjustment on an Anelastic Mantle ...

• Main Author: Ivins, Erik
• Format: Dataset
• Language: unknown
• Published: Root 2023
• Subjects: Greenland; Iceland; Svalbard; Alaska
• Online Access: https://dx.doi.org/10.48577/jpl.gkjqvp; https://dataverse.jpl.nasa.gov/citation?persistentId=doi:10.48577/jpl.GKJQVP

A general assumption in geodesy is that solid Earth deformation in the presence of recent hydrological and ice loading is well approximated by a purely elastic response. In cases where there is clear evidence that thermal and petrological conditions exist that favor vigorous high-temperature creep behavior, such as in the mantle beneath Iceland, Patagonia, Alaska, Japan, and Svalbard, many response models have been approximated by using a Maxwell viscoelasticity. However, non-Maxwellian transient viscoelastic rheology is required for many post-seismic relaxation studies. Here we reconsider the solid Earth response in light of highly temperature-dependent transient viscoelastic responses currently favored in the mineral physics and seismological communities. We develop a mantle response Green’s function that accounts for the vertical isostatic motion of the mantle caused by the acceleration of ice mass loss for Greenland and Patagonia measured by space-borne and airborne remote sensing since 1992 and 1945, ...