Preprints
There are 7997 Preprints listed.
Optimizing data usage in regional body wave tomography by using asynchronous network data and relative sensitivity kernels: an example from Patagonia
Published: 2025-04-20
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
A very frequent approach for studying lithospheric processes is to deploy temporary seismological networks in dedicated areas and to map the mantle structures with different approaches. One of them is the well-established relative travel time body wave tomography. Different circumstances often lead to a non-uniform deployment of stations both in space and time, and a wish to combine data which [...]
Not all DEMs are equal: An evaluation of six globally available 30 m resolution DEMs with geodetic benchmarks and LiDAR in Mexico
Published: 2021-02-05
Subjects: Earth Sciences
This work assesses the vertical accuracy of eight Digital Surface Models (DSMs) currently available for Mexico (LiDAR, ALOS AW3D30 V2 and V3, ASTER GDEM V2 and V3, SRTM, NASADEM and Mexico's Continuos Elevation Model (CEM)). The AW3D30, ASTER GDEM, SRTM and NASADEM DSMs cover nearly the entire globe and can be downloaded at no cost, while the LiDAR and CEM DSMs are distributed by Mexico's [...]
Impact of wave-vortical interactions on oceanic submesoscale lateral dispersion
Published: 2021-02-09
Subjects: Physical Sciences and Mathematics
Submesoscale lateral transport of a passive tracer and Lagrangian particles in the ocean is investigated by means of numerical simulations with intermediate models. Using a projection technique, the models are formulated in terms of wave-mode and vortical-mode nonlinear interactions, and they range in complexity from full Boussinesq to waves-only and vortical-modes-only models. We find that, on [...]
Increase data sharing or die? An initial view for natural catastrophe insurance
Published: 2021-02-09
Subjects: Earth Sciences, Education, Environmental Sciences, Geography
This article is an illustration of Geography in action, recounting an investigation into an industry's views of data sharing. The insurance sector is fundamentally analytics driven and based on geospatial data. One option for more effective and efficient insurance for natural hazard risks (e.g. flooding, earthquake) is, in theory, to increase the sharing of data between the various [...]
Creating and Promoting Gender Equity and Diversity in Professional Geological Societies: A Focus on AAPG
Published: 2021-02-10
Subjects: Education, Physical Sciences and Mathematics, Social and Behavioral Sciences
When professional organizations allow gender inequity to persist, they continually lose talented, valuable individuals who enrich and lead their groups and drive innovation. This paper presents an analysis of membership data and ways in which member contributions are recognized by the American Association of Petroleum Geologists (AAPG) between 2017-2020, in relation to gender. These are compared [...]
Application of automatic differentiation to the inversion of nonlinear mantle rheology using plate motion and topography
Published: 2025-04-23
Subjects: Geophysics and Seismology, Physical Sciences and Mathematics
The rheological properties of the mantle govern plate tectonics and mantle convection, yet constraining the rheological parameters remains a significant challenge. Laboratory experiments are usually performed under different temperature-pressure-strain-rate conditions than those of natural environments, leading to substantial uncertainties when extrapolating the parameters to real-world [...]
Improving the Robustness of the Comparison Model Method for the Identification of Hydraulic Transmissivities
Published: 2021-02-10
Subjects: Engineering, Physical Sciences and Mathematics
The Comparison Model Method (CMM) is a relatively simple and computationally efficient direct method for the identification of the transmissivity of a confined aquifer by solution of an inverse problem. However, it suffers some of the classical drawbacks related to ill-posedness and ill-conditioning of inverse methods. Effectiveness of the CMM can be improved by some approaches. First of all, the [...]
234U/230Th coral growth dating yields reliable ages in restricted basins despite anomalous δ234Ui values
Published: 2021-02-10
Subjects: Geochemistry, Geology, Tectonics and Structure
Late Quaternary coral growth ages from uplifted coastal regions, such as marine terraces and associated palaeoshorelines, are an essential tool used to derive tectonic and fault controlled uplift and deformation rates, and thus contribute to seismic hazard analysis and constrain past global sea levels. Fossil coral growth ages are assessed for reliability based upon whether the δ234Ui (or [...]
Thrusts control the thermal maturity of accreted sediments
Published: 2021-09-08
Subjects: Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure
Thermal maturity assessments of hydrocarbon-generation potential and thermal history rarely consider how upper-plate structures developing during subduction influence the trajectories of accreted sediments. Our thermomechanical models of subduction support that thrusts evolving under variable sedimentation rates and décollement strengths fundamentally influence the trajectory, temperature, and [...]
Reduced High-Latitude Land Seasonality in Climates with Very High Carbon Dioxide
Published: 2021-02-10
Subjects: Atmospheric Sciences, Climate, Oceanography and Atmospheric Sciences and Meteorology
Observations of warm past climates and projections of future climate change show that the Arctic warms more than the global mean, particularly during winter months. Past warm climates such as the early Eocene had above-freezing Arctic continental temperatures year-round. In this paper, we show that a reduced Arctic land seasonality with increased greenhouse gases is a robust consequence of the [...]
Using Landsat and Sentinel Imagery to Monitor Alfalfa and Grass Pastures in Western Colorado
Published: 2021-02-10
Subjects: Engineering, Physical Sciences and Mathematics
Crop phenology of alfalfa and grass pasture fields on the western slope of Colorado, USA, was tracked using an NDVI time series derived from Landsat 7 (ETM+), Landsat 8 (OLI) and Sentinel 2a MSI to obtain high temporal frequency information of crop growth stages. These perennial pastures, which occupy a majority of irrigated land in the region and typically have more than one growing/cutting [...]
Early warning for great earthquakes from characterization of crustal deformation patterns with deep learning
Published: 2021-02-10
Subjects: Earth Sciences
Although infrequent, large (Mw7.5+) earthquakes can be extremely damaging and occur on subduction and intraplate faults worldwide. Earthquake early warning (EEW) systems aim to provide advanced warning before strong shaking and tsunami onsets. These systems estimate earthquake magnitude using the early metrics of waveforms, relying on empirical scaling relationships of abundant past events. [...]
High-resolution observations of the North Pacific transition layer from a Lagrangian float
Published: 2021-02-11
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
A crucial region of the ocean surface boundary layer (OSBL) is the strongly-sheared and -stratified transition layer (TL) separating the mixed layer from the upper pycnocline, where a diverse range of waves and instabilities are possible. Previous work suggests that these different waves and instabilities will lead to different OSBL behaviours. Therefore, understanding which physical processes [...]
Analysis of fine particulates from fuel burning in a reconstructed building at Neolithic Çatalhöyük, Turkey and implications for respiratory health in early settled communities
Published: 2021-02-11
Subjects: Earth Sciences
The use of wood, dung and other biomass fuels can be traced back to early prehistory. Whilst the study of prehistoric fuel use and its environmental impacts is well established, there has been little investigation of the health impacts this would have had, particularly in the Neolithic period, when people went from living in relatively small groups, to living in dense settlements. The UNESCO [...]
Two-sided turbulent surface layer parameterizations for computing air-sea fluxes
Published: 2021-02-13
Subjects: Physical Sciences and Mathematics
Standard methods for determining air – sea fluxes typically rely on bulk algorithms set in the frame of Monin-Obukhov stability theory (MOST), using ocean surface fields and atmosphere near-surface fields. In the context of coupled ocean – atmosphere simulations, the shallowest ocean vertical level is usually used as bulk input and by default, the turbulent closure is one-sided: it extrapolates [...]