Coseismic deformations detectable by satellite gravity missions: A case study of Alaska (1964, 2002) and Hokkaido (2003) earthquakes in the spectral domain

摘要: [1] Coseismic deformations observed on the Earth surface or modeled by conventional dislocation theory cannot be compared directly with those gravity satellite missions because of spatial resolution limit and signal attenuation field. Coseismic in spectrum domain should considered instead. For this purpose [e.g., Sun Okubo, 1993] for a spherical model can used it is expressed form harmonic. In study, analytical expressions degree variances coseismic geoid changes shear tensile sources are derived calculated three real earthquakes. Those results expected errors Gravity Recovery Climate Experiment (GRACE) to elucidate whether not detectable missions. Behaviors four independent seismic investigated. Results indicate that both near two orders magnitude larger than precession low harmonic degrees. On basis these results, we minimum magnitudes earthquakes GRACE. We concluded an earthquake above m = 7.5 detected