Relative sea level rise, i.e., the combination of land subsidence and the eustatic rise of the sea level, is a major problem for the safety of Venice since the 1970s [e.g., Gambolati et al., 1974; Carbognin et al., 1977]. The most recent paper on the subject has been published by Bock et al. [2012]. In this Comment we (1) dispute the originality of the combined GPS and InSAR method presented by Bock et al. [2012] who missed some previous publication on the subject; (2) contest their statement of possible “bias” in our previous analyses which used similar methodologies; (3) question the “precision of 0.1–0.2 mm/yr with respect to a global reference frame” declared by the authors; and, (4) discuss on the meaning of “stability” versus “subsidence” for a coastal city like Venice settled above ~1500-m thick Quaternary unit with 20–30 m of Holocene poorly consolidated lagoon deposits.
Comment on "Recent subsidence of the Venice Lagoon from continuous GPS and interferometric synthetic aperture radar" by Y. Bock, S. Wdowinski, A. Ferretti, F. Novali, and A. Fumagalli
Teatini, P.
;
2012
Abstract
Relative sea level rise, i.e., the combination of land subsidence and the eustatic rise of the sea level, is a major problem for the safety of Venice since the 1970s [e.g., Gambolati et al., 1974; Carbognin et al., 1977]. The most recent paper on the subject has been published by Bock et al. [2012]. In this Comment we (1) dispute the originality of the combined GPS and InSAR method presented by Bock et al. [2012] who missed some previous publication on the subject; (2) contest their statement of possible “bias” in our previous analyses which used similar methodologies; (3) question the “precision of 0.1–0.2 mm/yr with respect to a global reference frame” declared by the authors; and, (4) discuss on the meaning of “stability” versus “subsidence” for a coastal city like Venice settled above ~1500-m thick Quaternary unit with 20–30 m of Holocene poorly consolidated lagoon deposits.
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