Preprints
There are 6081 Preprints listed.
Mid- to Late Neoproterozoic Development and Provenance of the Adelaide Superbasin
Published: 2022-03-22
Subjects: Earth Sciences, Geochemistry, Geology, Sedimentology, Stratigraphy, Tectonics and Structure
Late Tonian sequences of the Adelaide Superbasin were witness to the birth of the proto-Pacific Ocean during the breakup of Rodinia. Understanding the sedimentology and provenance of these rocks from across the basin is key to understanding their deposition over c. 70 million years, the local palaeogeography, and leads to a better understanding of the early development of the proto-Pacific Ocean. [...]
Discharge-driven rapid bank-erosion and its impact on sediment budgeting in lower Ganga valley: Evidences from Malda district, West Bengal, India
Published: 2022-03-22
Subjects: Physical Sciences and Mathematics
Riverbank erosion coupled with recurrent flooding has been a persistent problem in large parts of the Eastern India. Published data on bank erosion of the Ganga River in West Bengal suggests an annual average of 8 sq. km. land-loss during 1969-1999 and that potentially affected lives of nearly a million people and destroyed various human establishments. In this study, we aim to constrain the [...]
Reducing the Uncertainty of Multi-Well Petrophysical Interpretation from Well Logs via Machine-Learning and Statistical Models
Published: 2022-03-22
Subjects: Analysis, Earth Sciences, Engineering, Geophysics and Seismology, Mining Engineering, Multivariate Analysis, Statistical Methodology, Statistical Models
Well-log interpretation provides in situ estimates of formation properties such as porosity, hydrocarbon pore volume, and permeability. Reservoir models based on well-log-derived formation properties deliver reserve-volume estimates, production forecasts, and help with decision making in reservoir development. However, due to measurement errors, variability of well logs due to multiple [...]
Automated machine learning to evaluate the information content of tropospheric trace gas columns for fine particle estimates over India: a modeling testbed
Published: 2022-03-20
Subjects: Artificial Intelligence and Robotics, Atmospheric Sciences, Civil and Environmental Engineering, Computer Sciences, Earth Sciences, Environmental Engineering, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology
India is largely devoid of high-quality and reliable on-the-ground measurements of fine particulate matter (PM2.5). Ground-level PM2.5 concentrations are estimated from publicly available satellite Aerosol Optical Depth (AOD) products combined with other information. Prior research has largely overlooked the possibility of gaining additional accuracy and insights into the sources of PM using [...]
Temporal velocity variations in the northern Hikurangi margin and the relation to slow slip
Published: 2022-03-20
Subjects: Physical Sciences and Mathematics
Slow slip events (SSE) have been studied in increasing detail over the last 20 years, improving our understanding of subduction zone processes. Although the relationship between SSEs and the physical properties of their surrounding materials is still not well-understood, the northern Hikurangi margin in New Zealand is the site of relatively shallow ( < 10 km deep), frequent SSEs, providing [...]
Internal Planetary Feedbacks, Mantle Dynamics, and Plate Tectonics
Published: 2022-03-18
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Planetary Geophysics and Seismology, Planetary Sciences, Tectonics and Structure
Isolating planetary feedbacks, and feedback analysis, are prevalent aspects of climate and Earth surface process science. An under appreciation of internal planet feedbacks, and feedback analysis for plate tectonics research, motivate this chapter. We review feedbacks that influence the Earth's thermal evolution and expand them to include magmatic history and planetary water budgets. The [...]
Investment needs to achieve SDGs: an overview
Published: 2022-03-18
Subjects: Environmental Studies
Estimating the investments needed to achieve the Sustainable Development Goals (SDGs) is key to mobilising the financial resources to achieve them. Despite an increasing body of research to estimate the capital and operational costs towards achieving various related SDG targets individually and collectively, an overview of the total estimated investment needs at the global [...]
African sand storms, blood rain, and continental mineral delivery to the Canary Islands
Published: 2022-03-17
Subjects: Physical Sciences and Mathematics
The origin of volcanism in the Canary Islands has been a matter of controversy for decades. Discussions have hinged on whether the Canaries owe their origin to seafloor fractures associated with the Atlas Mountain range or to an underlying plume or hotspot of uprising hot material from the deep mantle. The debate has recently concluded, however, following the discovery of nannofossils preserved [...]
Large-area mapping of active cropland and short-term fallows in smallholder landscapes using PlanetScope data
Published: 2022-03-17
Subjects: Environmental Studies, Geographic Information Sciences, Nature and Society Relations, Remote Sensing, Spatial Science
Cropland mapping in smallholder landscapes is challenged by complex and fragmented landscapes, labor-intensive and unmechanized land management causing high within-field variability, rapid dynamics in shifting cultivation systems, and substantial proportions of short-term fallows. To overcome these challenges, we here present a large-area mapping framework to identify active cropland and [...]
Cloud-based interactive susceptibility modeling of natural hazards in Google Earth Engine
Published: 2022-03-17
Subjects: Engineering, Physical Sciences and Mathematics
We present an interactive tool for susceptibility modeling in Google Earth Engine (GEE). Our tool requires few input data and makes use of the breadth of predictors' information available in GEE. In this cloud computing environment, binary classifiers typical of susceptibility models can be called and fed with information related to mapping units and any natural hazards' distribution over the [...]
On the estimation of landslide intensity, hazard and density via data-driven models
Published: 2022-03-17
Subjects: Earth Sciences, Environmental Sciences
Maps that attempt to predict landslide occurrences have essentially stayed the same since Brabb, E.E., Pampeyan, E.H. and Bonilla, M.G. (1972) Landslide susceptibility in San Mateo County, California (No. 360), US Geological Survey. The tools have certainly changed in fifty years. But, the geomorphological community addressed and still addresses this issue by estimating whether a given slope is [...]
Complex multi-source emissions quantification results for the PoMELO vehicle measurement system, test results from the CSU METEC facility
Published: 2022-03-17
Subjects: Atmospheric Sciences, Operations Research, Systems Engineering and Industrial Engineering, Other Engineering, Petroleum Engineering, Systems Engineering
Methane emissions from oil and gas sites are often characterized by mixed plumes from multiple sources in close proximity. This presents a challenge for screening methods that rely on emissions quantification to direct and prioritize follow-up inspections. Here, we present results from experiments evaluating mixed-source quantifications using the University of Calgary Portable Methane Leak [...]
Rapid tremor migration during few minute-long slow earthquakes in Cascadia
Published: 2022-03-17
Subjects: Earth Sciences
Slow earthquakes are now commonly found to display a wide range of durations, moments, and slip and propagation speeds. But not all types of slow earthquakes have been examined in detail. Here we probe tremor bursts with durations between 1 and 30 minutes, which are likely driven by few minute-long bursts of aseismic slip. We use a coherence based technique to detect thousands of tremor bursts [...]
Self-replicating subduction zone initiation by polarity reversal
Published: 2022-03-15
Subjects: Earth Sciences, Geology, Tectonics and Structure
Subduction zones have recurrently formed on Earth. Previous studies have, however, suggested that they are unlikely to start in the interior of a pristine ocean. Instead, they seem to be more likely to form from another pre-existing subduction zone. One widely cited conceptual model to start new subduction zones is polarity reversal, resulting from the shutdown of a pre-existent subduction zone [...]
User guide of Google Earth Engine based Analytical Hierarchy Process (AHP) Tool
Published: 2022-03-15
Subjects: Physical Sciences and Mathematics