This dataset provides rheometric data of the PDMS Korasilon G 20 OH used for analogue modelling at the Laboratory for Experimental Tectonics at GFZ Helmholtz Centre for Geosciences, Potsdam, Germany. The batch number is 1000039264, purchased in 2022 and opened in 2026.
The material sample has been analyzed at the Laboratory for Experimental Tectonics at GFZ Helmholtz Centre for Geosciences, Potsdam (HelTec) using an Anton Paar Physica MCR 301 rheometer in a cone-plate configuration at room temperature (21˚C). Rotational (controlled shear rate) tests with shear rates varying from 10^-4 to 10^-1 s^-1 were performed.
According to our rheometric analysis, the material is quasi-Newtonian (n~1) at strain rates below 10^-2 s^-1 and weakly shear rate thinning above. The viscosity of G 20 OH is 1.8*10^4 Pa s.
The lithosphere-asthenosphere boundary (LAB) marks the base of the Earth’s outer layer where heat is transferred primarily by conduction as compared to prevailing convective heat transport below. Spatial variations in LAB depth reveal the differential evolution of tectonic systems (e.g., rifts and orogens), thus enabling a better understanding of geodynamic processes. Further, the topography of the LAB exerts control on the coupling of the lithosphere to asthenospheric flow, modulating the distribution of present-day stresses and active deformation of the tectonic plates. We have derived global depth variations of the LAB from temperature-converted shear-wave tomography models assuming that the threshold temperature between conduction and mantle convection is 1300 °C. Shear-wave velocity in the mantle is controlled by both in situ pressure-temperature conditions and mineralogical rock composition. Therefore, our velocity-to-temperature conversion builds on a framework of rock physical properties generated through a Gibbs free energy minimization to determine thermodynamically stable phase and mineral assemblages throughout upper mantle pressure and temperature conditions. In this data publication, we provide thermal LAB depths corresponding to one European-scale and three global-scale tomography models. The data release includes (i) a data description file with information on the input tomographic models, the conversion method and spatial variations in LAB depth (illustrated); and (ii) four data files with LAB depth values spatially sampled according to the input tomography models.
This data set contains hypocentral parameters (latitude, longitude, depth, local magnitude, and origin time) for 13566 aftershocks of the 2019, M6.4 Durrës, Albania earthquake. Aftershocks were recorded with a 30 station local network, which started operation about two weeks after the and registered for about nine months. Event detections were produced with machine-learning-based tools. Aftershocks were located with a newly derived 1D velocity model with station corrections. Final relocation was done with the double-difference algorithm including cross correlation derived differential travel times. Local magnitudes range from Ml −1.8 to 4.6 with a magnitude of completeness of Mc ≈ 1.
The Drilling the Ivrea-Verbano zonE (DIVE) project, run as ICDP expedition 5071, aims at studying the lower continental crust (LCC) towards and across the Moho transition zone. The study area provides unique access to a section of the LCC with well-preserved structural relationships. Two drilling targets were selected from this zone for scientific investigations, which, in combination, reveal significant aspects of its geologic history. The goals of the project are primarily petrological-geochemical, geophysical, structural, microbiological, and focusing on natural gases. Two boreholes have been successfully drilled in project DIVE 1: first 5071_1_B near Ornavasso in 2022, then 5071_1_A in Megolo in 2023-2024.
This data publication provides the operational dataset of the ICDP project DIVE (ICDP 5071). The dataset is documented by the Explanatory Remarks (https://doi.org/10.48440/ICDP.5071.002).