Global sea level rise

Douglas, Bruce C.

doi:10.1029/91jc00064

Cited by 500 publications

(362 citation statements)

References 9 publications

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“…From least-squares interpolation of the times series shown here, the global average rate during the last century amounts to 0.17 mm/yr, showing that earthquake-induced sealevel variations at these sites represents a non negligible fraction of the global longterm rate of 1.8 ± 0.1 mm/yr, obtained by Douglas [1991Douglas [ , 1997 from these same sites after the GIA correction. We observe that, due to the stepwise sealevel signal expected by seismic activity, the average rate could be larger when taken on a year to-decade time-scale.…”

Section: Methods and Resultsmentioning

confidence: 99%

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Earthquakes and relative sealevel changes

Melini

Piersanti

Spada

et al. 2004

Geophysical Research Letters

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[1] Using a spherical model of postseismic deformation, for the first time we have computed the global contribution of large earthquakes to the relative sealevel variations in the twentieth century. We have found that great earthquakes have the overall tendency to produce a sealevel rise, and that they affect the measurements taken at those tide-gauge sites that are commonly employed to obtain global estimates of sealevel rise. Though on a global scale most of the signal is associated with thrust events, on a regional scale the effects of great transcurrent earthquakes cannot be neglected. Depending on the viscosity of the asthenosphere, the contribution of earthquakes to the long-term sealevel changes amounts to at least 0.1 mm/yr. Thus, the climatedriven long-term sealevel changes deduced by tide-gauge observations may be slightly, but not negligibly, overestimated.

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Section: Methods and Resultsmentioning

confidence: 99%

“…These 24 sites have been preferred by Douglas for their expected tectonic stability and for the length of their sealevel records, which exceeds 70 years. To facilitate our discussion, we have conducted a region-by-region study similar to that done by Douglas [1991Douglas [ , 1997.…”

Section: Methods and Resultsmentioning

confidence: 99%

Earthquakes and relative sealevel changes

Melini

Piersanti

Spada

et al. 2004

Geophysical Research Letters

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“…It thus fits Douglas's [1991] criterion of >60 years and Houston and Dean's [2013] criterion of >75 years for the reliable estimation of MSL trends and accelerations, respectively, though interannual and decadal variability of MSL remains problematic along the Western Australian coast [e.g., Amin, 1993;Nidheesh et al, 2013]. Nevertheless, the length of the FREM record means that it has been used in many global and regional sea level assessments [e.g., Holgate and Woodworth, 2004;Fenoglio-Marc and Tel, 2010;Bouin and W€ oppelmann, 2010;Houston and Dean, 2012;Burgette et al, 2013, as well as the references cited earlier].…”

Section: The Fremantle Tg and Previous Vlm Estimatesmentioning

confidence: 99%

“…It has been omitted from some studies that consider global analysis from only long-term TGs [e.g., Douglas, 1991Douglas, , 1992. Claims have been made that it is vertically stable, albeit through a personal communication [Feng et al, 2004], or it has been implicitly assumed to be vertically stable [Burgette et al, 2013].…”

Section: The Fremantle Tg and Previous Vlm Estimatesmentioning

confidence: 99%

Nonlinear subsidence at Fremantle, a long‐recording tide gauge in the Southern Hemisphere

et al. 2015

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A combination of independent evidence (continuous GPS, repeat geodetic leveling, groundwater abstraction, satellite altimetry, and tide gauge (TG) records) shows that the long‐recording Fremantle TG has been subsiding in a nonlinear way since the mid‐1970s due to time‐variable groundwater abstraction. The vertical land motion (VLM) rates vary from approximately −2 to −4 mm/yr (i.e., subsidence), thus producing a small apparent acceleration in mean sea level computed from the Fremantle TG records. We exemplify that GPS‐derived VLM must be geodetically connected to the TG to eliminate the commonly used assumption that there is no differential VLM when the GPS is not colocated with the TG. In the Perth Basin, we show that groundwater abstraction can be used as a diagnostic tool for identifying nonlinear VLM that is not evident in GPS time series alone.

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“…records, which exceeds 70 years, for their expected tectonic stability, and for their worldwide coverage. We have grouped these PSMSL sites regionally, as done by Douglas [1991Douglas [ , 1997.…”

Section: Effects On Psmsl Sitesmentioning

confidence: 99%

Impact of global seismicity on sea level change assessment

Melini

Piersanti

2006

J. Geophys. Res.

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[1] We analyze the effect of seismic activity on sea level variations by computing the time-dependent vertical crustal movement and geoid change due to coseismic deformations and postseismic relaxation effects. Seismic activity can affect both the absolute sea level, changing the Earth's gravity field and hence the geoid height, and the relative sea level (RSL), i.e., the radial distance between seafloor and geoid level. By using comprehensive seismic catalogs we assess the net effect of seismicity on tidal relative sea level measurements as well as on the global oceanic surfaces, and we obtain an estimate of absolute sea level variations of seismic origin. We modified the approach adopted in our previous analysis, considering the issue of water volume conservation by applying the sealevel equation, and we improved our computational methods, enabling us to evaluate the effect of an extremely large number of earthquakes on large grids covering the whole oceanic surface. These new potentialities allow us to perform more detailed investigations and to discover a quantitative explanation for the overall tendency of earthquakes to produce a positive global relative sea level variation. Our results confirm the finding of a previous analysis that on a global scale most of the signal is associated with a few giant thrust events and that RSL estimates obtained using tide gauge data can be sensibly affected by the seismically driven sea level signal. The recent measures of sea level obtained by satellite altimetry show a wide regional variation of sea level trends over the oceanic surface, with the largest deviations from the mean trend occurring in tectonically active regions. While our estimates of average absolute sea level variations turn out to be orders of magnitude smaller than the satellite-measured variations, we can still argue that the mass redistribution associated with aseismic tectonic processes may contribute to the observed regional variability of sea level variations. A detailed study of these tectonic contributions is important to acquire a complete understanding of the global sea level variations and will be the subject of future investigations.

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Global sea level rise

Cited by 500 publications

References 9 publications

Earthquakes and relative sealevel changes

Earthquakes and relative sealevel changes

Nonlinear subsidence at Fremantle, a long‐recording tide gauge in the Southern Hemisphere

Impact of global seismicity on sea level change assessment

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