dorsal/arxiv
View SchemaImpact of global seismicity on sea level change assessment
| Authors | D. Melini, A. Piersanti |
|---|---|
| Categories | |
| ArXiv ID | physics/0509258 |
| URL | https://arxiv.org/abs/physics/0509258 |
| DOI | 10.1029/2004JB003476 |
Abstract
We analyze the effect of seismic activity on sealevel 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 sealevel, by changing the Earth gravity field and hence the geoid height, and the relative sealevel, i.e. the radial distance between seafloor and geoid level. By using comprehensive seismic catalogues we assess the net effect of seismicity on tidal relative sealevel measurements as well as on the global oceanic surfaces, and we obtain an estimate of absolute sealevel variations of seismic origin. Our results confirm that, on a global scale, most of the signal is associated with few giant thrust events, and that RSL estimates obtained using tide-gauge data can be sensibly affected by the seismic driven sealevel signal. The recent measures of sealevel obtained by satellite altimetry show a wide regional variation of sealevel trends over the oceanic surfaces, with the largest deviations from the mean trend occurring in tectonically active regions. While our estimates of average absolute sealevel variations turn out to be orders of magnitude smaller than the satellite measured variations, we can still argue that mass redistribution associated with aseismic tectonic processes may contribute to the observed regional variability of sealevel variations.
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"abstract": "We analyze the effect of seismic activity on sealevel variations, by\ncomputing the time-dependent vertical crustal movement and geoid change due to\ncoseismic deformations and postseismic relaxation effects. Seismic activity can\naffect both the absolute sealevel, by changing the Earth gravity field and\nhence the geoid height, and the relative sealevel, i.e. the radial distance\nbetween seafloor and geoid level. By using comprehensive seismic catalogues we\nassess the net effect of seismicity on tidal relative sealevel measurements as\nwell as on the global oceanic surfaces, and we obtain an estimate of absolute\nsealevel variations of seismic origin.\n Our results confirm that, on a global scale, most of the signal is associated\nwith few giant thrust events, and that RSL estimates obtained using tide-gauge\ndata can be sensibly affected by the seismic driven sealevel signal.\n The recent measures of sealevel obtained by satellite altimetry show a wide\nregional variation of sealevel trends over the oceanic surfaces, with the\nlargest deviations from the mean trend occurring in tectonically active\nregions. While our estimates of average absolute sealevel variations turn out\nto be orders of magnitude smaller than the satellite measured variations, we\ncan still argue that mass redistribution associated with aseismic tectonic\nprocesses may contribute to the observed regional variability of sealevel\nvariations.",
"arxiv_id": "physics/0509258",
"authors": [
"D. Melini",
"A. Piersanti"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1029/2004JB003476",
"title": "Impact of global seismicity on sea level change assessment",
"url": "https://arxiv.org/abs/physics/0509258"
},
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