Preprints
There are 5531 Preprints listed.
A Vision for the Future Low-Temperature Geochemical Data-scape
Published: 2020-11-21
Subjects: Biogeochemistry, Computer Sciences, Databases and Information Systems, Earth Sciences, Environmental Sciences, Geochemistry, Geology, Geomorphology, Hydrology, Other Computer Sciences, Other Earth Sciences, Soil Science
Data sharing benefits the researcher, the scientific community, and most importantly, the public by enabling more impactful analysis of data and greater transparency in scientific research. However, like many other scientists, the low-temperature geochemistry (LTG) community has generally not developed protocols and standards for publishing, citing, and versioning datasets. This paper is the [...]
Rare occurrences of non-cascading foreshock activity in Southern California
Published: 2020-11-20
Subjects: Geophysics and Seismology
Earthquakes preceding large events are commonly referred as foreshocks. They are often considered as precursory signals reflecting the nucleation process of the main rupture. Such foreshock sequences may also be explained by cascades of triggered events. Recent advances in earthquake detection is a motivation to re-evaluate seismicity variations prior to mainshocks. Based on a highly complete [...]
Mantle earthquakes in recently thinned Neoproterozoic lithosphere: Harrat Lunayyir, Saudi Arabia
Published: 2020-11-20
Subjects: Geophysics and Seismology, Tectonics and Structure
We use earthquake geothermometry, measured heat flow, and structural constraints from P-wave receiver functions to model the thermal evolution of the lithosphere beneath Harrat Lunayyir. We suggest that the lithosphere thinned to its present 60-km thickness in a second stage of lithospheric thinning at 15–12 Ma following initial Red Sea extension at ~27 Ma. Harrat Lunayyir is an active volcanic [...]
Particle energy partitioning and transverse diffusion during rarefied travel on an experimental hillslope
Published: 2020-11-19
Subjects: Earth Sciences, Geomorphology
Recent theoretical and experimental work (Furbish et al., 2020a, 2020b) indicates that rarefied particle motions on rough hillslope surfaces are controlled by the balance between gravitational heating of particles due to conversion of potential to kinetic energy and frictional cooling of the particles due to collisions with the surface. Here we elaborate how particle energy is partitioned [...]
A quantitative assessment of the hydrogen storage capacity of the UK continental shelf
Published: 2020-11-19
Subjects: Oil, Gas, and Energy
Increased penetration of renewable energy sources and decarbonisation of the UK's gas supply will require large-scale energy storage. Using hydrogen as an energy storage vector, we estimate that 150 TWh of seasonal storage is required to replace seasonal variations in natural gas production. Large-scale storage is best suited to porous rock reservoirs. We present a method to quantify the hydrogen [...]
Photogrammetry in ichnology: 3D model generation, visualisation, and data extraction
Published: 2020-11-19
Subjects: Paleontology
3D digitisation of surfaces became a standard procedure in ichnology in recent years. 3D models allow not only for the digital preservation of vulnerable ichnological records, but also for the illustration, qualitative description, and quantitative analysis of the fossils. Here we discuss how to obtain photographs for photogrammetry, to generate, scale, and orient the models, and to extract [...]
The development of intermittent multiphase fluid flow pathways through a porous rock
Published: 2020-11-18
Subjects: Engineering, Physical Sciences and Mathematics
Intermittent fluid flow has recently been identified as an important transport mode for subsurface multiphase flow systems such as CO2 storage and natural gas production. However, due to experimental limitations, it has not been possible to identify why intermittency occurs at subsurface conditions and what the implications are for upscaled flow properties such as relative permeability. We [...]
Times associated with source-to-sink propagation of environmental signals during landscape transience
Published: 2020-11-18
Subjects: Earth Sciences
Sediment archives in the terrestrial and marine realm are regularly analyzed to infer changes in climate and tectonic boundary conditions of the past. However, contradictory observations have been made regarding whether short period events are faithfully preserved in stratigraphic archives; for instance, in marine sediments offshore large river systems. On the one hand, short period events are [...]
Architecture and sequence stratigraphy of the Upper Coralline Limestone formation, Malta – implications for Eastern Mediterranean restriction prior to the Messinian Salinity Crisis
Published: 2020-11-18
Subjects: Geology, Sedimentology, Stratigraphy
The Eastern and Western Mediterranean are separated by an elevated plateau that regulates water exchange between these two basins. The Maltese archipelago, situated atop this topographic high, offers a unique window into the evolution of this plateau in the lead up to the Messinian Salinity Crisis (MSC). The Upper Coralline Limestone formation was deposited between the late Tortonian and the [...]
Future magnitude 7.5 earthquake offshore Martinique: Spotlight on the main source features controlling ground motion prediction
Published: 2020-11-18
Subjects: Civil and Environmental Engineering, Geophysics and Seismology, Geotechnical Engineering
The eastern offshore of Martinique is one of the active areas of the Lesser Antilles Subduc tion Zone (LASZ). Although its seismicity is moderate compared to other subduction zones, LASZ is capable of generating a M 7+ interplate earthquake and recent studies and historical events, such as the M8 1839 and M 7-7.5 1946 earthquakes, confirm this possibility. Given the high risk that Martinique can [...]
How fast can minibasins translate down a slope? Observations from 2D numerical models
Published: 2020-11-18
Subjects: Earth Sciences, Physical Sciences and Mathematics
Minibasins are important features in salt-bearing basins and they are mostly found in salt-detached continental slopes where the sedimentary cover undergoes seaward translation. One question which is relevant to understand the structural evolution of salt-detached slopes is how fast can the sedimentary cover and the minibasins translate. The aim of this study is three-fold: 1) to compare [...]
Radiative feedbacks on land surface change and associated tropical precipitation shifts
Published: 2020-11-17
Subjects: Physical Sciences and Mathematics
Changes in land surface albedo and land surface evaporation modulate the atmospheric energy budget by changing temperatures, water vapor, clouds, snow and ice cover, and the partitioning of surface energy fluxes. Here idealized perturbations to land surface properties are imposed in a global model to understand how such forcings drive shifts in zonal mean atmospheric energy transport and zonal [...]
Global lockdown potential impact on achieving Sustainable Development Goals
Published: 2020-11-17
Subjects: Environmental Studies, Life Sciences
Coronavirus disease (COVID-19) pandemic has led to a lockdown worldwide. This restriction on human movements and activities significantly influences society and the environment. We examined the consequences of global lockdown for human movement and nitrogen dioxide (NO2) emissions using an air pollution index and dataset and satellite image analyses. We also evaluated the immediate (during [...]
International Meeting 40 years of the 1980 Azores Earthquake, 6th - 7th October 2020 - Conference Report
Published: 2020-11-16
Subjects: Earth Sciences, Environmental Indicators and Impact Assessment, Geophysics and Seismology, Other Civil and Environmental Engineering
The main goal of the International Meeting “40 Years of the 1980 Azores Earthquake” was promoting a reflection of the earthquake of January 1st, 1980, and the advances since them on topics like seismology, seismic hazard, and risk, building rehabilitation and public policies. Nevertheless, due to the COVID-19 outbreak, the organizing committee decided that the meeting should be online and [...]
A global Bayesian temperature calibration for lacustrine brGDGTs
Published: 2020-11-13
Subjects: Biogeochemistry, Climate
Despite widespread use of branched glycerol dialkyl glycerol tetraethers (brGDGTs) for paleo-temperature reconstruction, no global calibration for their application in lakes has been generated since improved analytical methods have allowed for the separation of the structural isomers. This is a substantial obstacle for the application of this tool as soil calibrations underestimate temperature [...]