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Displacements and tilts from dip‐slip faults and magma chambers beneath irregular surface topography
Author(s) -
McTigue D. F.,
Segall P.
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i006p00601
Subject(s) - geology , slip (aerodynamics) , volcano , basin and range topography , seismology , fault (geology) , deformation (meteorology) , geometry , geodesy , petrology , tectonics , physics , thermodynamics , oceanography , mathematics
Surface displacements and tilts due to buried deformation sources are influenced by topography. The leading‐order corrections due to topography of arbitrary profile, but small slope, are determined for dip‐slip faults (edge dislocations) and magma bodies (lines of inflation) in a two‐dimensional elastic medium. The vertical displacement correction is simply the product of the topography and the horizontal normal strain due to the source in a flat half‐space. The correction for a normal fault beneath an idealized basin‐and‐range topography is a slight increase in the uplift on the range side. The effect of topography for a line of inflation beneath a symmetric volcano is to reduce the central uplift. Failure to account for topographic influences can bias estimates of source depth and geometry.