Minelli jackson3/22/2023 All the seismic reflection profiles shown in the position map are available at. (a) Location map of the publicly wells and seismic reflection profiles analyzed in the Crotone basin (in white profiles F75-66 and F75-113 shown in Figures 2c and 2d) and three of the eight GPS stations (KROT, STSV, and CCRI). To understand the cause of the anomalous KROT velocity, we examined the onshore geology of the Crotone basin and integrated it with our interpretation of offshore seismic reflection profiles and well logs (Figures 2, S2, and S3). Residual velocities are nearly null (≤1 mm/yr) at all stations, except KROT, which has a residual velocity of 4.84 mm/yr toward the east (Figure 1b). To test the hypothesis that this station was influenced by a local cause, we computed the mean regional velocity for the other seven GPS stations (4.9 mm/yr) and then calculated the residual local velocity of each of the eight stations by subtracting the mean regional velocity from the measured ones. Consistently with previous studies (Figures 1a and S1), our data indicate a general homogenous motion of Calabria toward the NNE at a rate of ~5 mm/yr (in a Eurasia-fixed reference frame), with the exception of the Crotone station (KROT), which moves at a velocity of 8.08 mm/yr toward the NE (Figure 1a). We analyzed 3 years of GPS data (Figure 1b and Table S1 in the supporting information) using the GAMIT/GLOBK software and standard processing procedures. In 2006, within the framework of the Calabrian Arc Project funded by the National Science Foundation ( ), eight continuous GPS stations were installed along a NW-SE transect through northern Calabria (Figure 1). The eight GPS stations shown by red dots were installed for the Calabrian Arc Project. (b) Residual (local) GPS velocities (Table S1) obtained by subtracting the mean regional velocity (blue arrow, calculated excluding the KROT station) from the total velocities measured at the stations. Inset shows a schematic map of the Apennines-Ionian-Maghrebides subduction system. (a) GPS velocities (error ellipse 95%) for Calabria (see also Figure S1) in a Eurasia-fixed reference frame. We conclude deriving the viscosity of rock salt from this rate and other evidence. The novel aspect of our analysis is that we are able to determine the slide seaward gliding rate through GPS measurements. Coupling geological and geophysical data, we constrain its geometry and structure. Below, we report on the discovery of an actively gliding salt-detached megaslide in the Crotone basin, Calabria, southern Italy (Figure 1). No direct measurements of salt tectonics rates exist, for instance, on large salt-detached slides. However, direct measurements of salt tectonics rates in nature are still very limited and principally carried out on exposed salt diapirs and cascades. Understanding salt tectonics processes and measuring the related deformation rates are hence crucial both for industrial and for civil reasons. Additionally, where salt tectonics occur on land, it may pose serious hazard to civil works and constructions. The study of salt-related structures and of rock salt properties (deformation rate and viscosity) is relevant for different applications, including hydrocarbon exploration and safe storage of hazardous wastes.
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