| Titre | Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data |
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| Auteur | Mazzotti, S ;
Lambert, A; Courtier, N; Nykolaishen, L; Dragert, H |
| Source | Geophysical Research Letters vol. 34, L15306, 2007 p. 1-5, https://doi.org/10.1029/2007GL030283  Accès ouvert |
| Image |  |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20070149 |
| Éditeur | Wiley-Blackwell |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1029/2007GL030283 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Colombie-Britannique; Région extracotière de l'ouest |
| SNRC | 82E; 92B; 92C; 92F; 92G; 92H |
| Région | Victoria; Patricia Bay; Nanoose; Tofino; Penticton; Friday Harbor; Seattle; Neah Bay; Astoria |
| Lat/Long OENS | -126.0000 -120.0000 50.0000 46.0000 |
| Sujets | gravité; soulèvement de la croûte; variations du niveau de la mer; levés gravimétriques; levés géophysiques; Cascadie |
| Illustrations | croquis cartographiques |
| Programme | Réduction des risques dus aux aléas naturels |
| Diffusé | 2007 08 14 |
| Résumé | (disponible en anglais seulement)
We combine data from nine GPS, absolute gravity, and tide gauge stations to estimate the relation between sea-level rise, vertical motion, and solid Earth
processes in the Pacific Northwest. GPS vertical velocities (in ITRF2000) and absolute gravity rates are well correlated, with a gradient of 0.2 ± 0.1 microgal/mm, but show a significant offset of 0.53 ± 0.30 microGal/yr (2.2 ± 1.3 mm/yr) (95%
confidence). Tide gauge and GPS data indicate a northeast Pacific regional sea-level rise of 1.7 ± 0.5 mm/yr, aligned to ITRF2000, or an unlikely regional sea-level fall of 0.6 ± 0.5 mm/yr, aligned to absolute gravity. Although we cannot rule out a
bias in the GPS reference-frame alignment, our results suggest a possible absolute gravity bias by a long-period mass increase from an unknown near-surface or deep-seated source. The impact of such a mass increase on gravity, vertical motion, and sea
level remains to be defined. |
| GEOSCAN ID | 224064 |
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