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Displacement and gravity changes due to different sources in layered media

AuthorsFernández Torres, José ; Yu, Ting-To; Rundle, J. B.
Gravity changes
Geoid changes
Issue Date1997
PublisherCSIC-UCM - Instituto de Astronomía y Geodesia (IAG)
CitationPublicación. Instituto de Astronomía y Geodesia. 1997, nº 191
SeriesPublicación. Instituto de Astronomía y Geodesia
AbstractWe describe theoretical and computational methods developed by our group for the calculation of displacement, gravity and potential changes resulting from different sources (representing magma bodies and faults) in elastic-gravitational and viscoelastic-gravitationallayered media. The existing codes corresponding to the models are also presented with the information about how they can be obtained for scientific use. The results obtained and work currently in progress are also described in this paper.
The subsurface deformation associated with earthquake faulting is modeled within a three-dimensional homogeneous half-space. It is found that at the boundary of ruptured fault, the strike slip faulting changes mainly the horizontal displacement field, shear stress; while dip slip events affect primarily both the vertical and horizontal components, normal stress. Yiscoelastic gravitational layered model was utilized for computing the postseismic displacement. The modeled postseismic subsurface uplift for five historical events match the geoid high found in the Himalayas. Such geoid residual may serve as a signature of historical events thus can be used to study the existence of seismic gaps.
DescriptionPresented in the First Meeting of Special Study Group 4.176 (Models of temporal variations of the gravity field) of the International Association of Geodesy
Appears in Collections:(IAG) Comunicaciones congresos
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