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Reconciling geodetic and geological rates of vertical crustal motion in intraplate regions
Demoulin, A
Earth and planetary science letters, 2004-04, Vol.221 (1), p.91-101
[Periódico revisado por pares]
Elsevier B.V
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Título:
Reconciling geodetic and geological rates of vertical crustal motion in intraplate regions
Autor:
Demoulin, A
Assuntos:
crustal motion
;
Earth sciences & physical geography
;
fault creep
;
geodetic rate
;
hydrological factor
;
intraplate
;
levelling
;
Physical, chemical, mathematical & earth Sciences
;
Physique, chimie, mathématiques & sciences de la terre
;
Sciences de la terre & géographie physique
É parte de:
Earth and planetary science letters, 2004-04, Vol.221 (1), p.91-101
Notas:
scopus-id:2-s2.0-2342442818
Descrição:
Tectonic motion rates of individual faults and regional deformation in an intraplate setting are estimated, based on the analysis of ten yearly surveys of a regional levelling network in NE Ardenne (W Europe). Owing to the frequency and number of measurement epochs, much greater than in classical comparisons of general surveys, the tectonic and near-surface components of ground motion are clearly separated. The marked temporal variability in ground motion strongly depends on the amount of precipitation fallen during the six months preceding each survey and the subsequent drying off of the subsoil at the time of the surveys. Moreover, the ground response to this influence varies from place to place, leading to high differential movements at the local scale. Taking into account the percentage of surveyed faults which moved tectonically during the time of the study, I calculate fault motion rates of 0.06–0.09 mm/yr, similar to geological rates. Moreover, the data indicate that one way for intraplate normal faults to accommodate tectonic strain aseismically is intermittent fault creep, with short episodes of a few mm displacement separated by many year-long time intervals of fault quiescence. A flexural deformation shows the superposition of a tilt event on a trend corresponding to a tilt rate of 0.16 μrad/yr for a 2.8-km-long segment.
Editor:
Elsevier B.V
Idioma:
Inglês
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