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2021

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Articles 15961 - 15990 of 16206

Full-Text Articles in Earth Sciences

Tectonic Geomorphology Of The Yatağan Fault (Muğla, Sw Turkey): Implications For Quantifying Vertical Slip Rates Along Active Normal Faults, Mehran Basmenji, Taylan Sançar, Aynur Di̇kbaş, Sarah Jean Boulton, Hüsnü Serdar Akyüz Jan 2021

Tectonic Geomorphology Of The Yatağan Fault (Muğla, Sw Turkey): Implications For Quantifying Vertical Slip Rates Along Active Normal Faults, Mehran Basmenji, Taylan Sançar, Aynur Di̇kbaş, Sarah Jean Boulton, Hüsnü Serdar Akyüz

Turkish Journal of Earth Sciences

South Western Anatolia is dominated by E-W and NW-SE trending active faults. The dip-slip Yatağan Fault is one of these active structures that trends in a NW direction for ~30 km. To assess the relative tectonic activity of the Yatağan Fault, two geomorphic segments were defined along the fault: the FS-1 (northern segment) and the FS-2 (southern segment). The vertical slip rate pattern of the fault was analyzed using steepness indexes, chi (χ) plots, and log-log slope area graphs. Results of the analyses indicate that the steepness of the streams draining the footwall reveal increasingly higher values downstream along the …

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Interpretation Of Magnetic Data Using Boundary Analysis And Inversion Techniques: A Case Study From Gölcük/Isparta (Turkey) Region, Coşkun Sari, Emre Ti̇mur Jan 2021

Interpretation Of Magnetic Data Using Boundary Analysis And Inversion Techniques: A Case Study From Gölcük/Isparta (Turkey) Region, Coşkun Sari, Emre Ti̇mur

Turkish Journal of Earth Sciences

The Gölcük (Isparta) is on the southern side of the city of Isparta in the Mediterranean region of Turkey. The investigation of magnetic field strength variations over subterranean layers may reveal their locations on Earth?s surface and provide physical and geometrical characteristics. Magnetic studies were carried out around Gölcük caldera lake using proton magnetometers to identify subsurface volcanic structures. The acquired data were inverted using four different edge detection algorithms such as analytic signal, tilt angle, theta map, horizontal gradient. Afterwards, the results were used to determine the locations of the anomalous structures. We also used pseudo-gravity and reduction-to-pole techniques …

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Recent Earthquake Activity Of March 2021 In Northern Thessaly Unlocks New Scepticism On Faults, Spyros Pavlides, Sotiris Sboras Jan 2021

Recent Earthquake Activity Of March 2021 In Northern Thessaly Unlocks New Scepticism On Faults, Spyros Pavlides, Sotiris Sboras

Turkish Journal of Earth Sciences

This short opinion article presents and highlights new and old problems related to active geological faults, as seismic sources, after the experience of the last March 3 and 4, 2021 (Mw6.3 and Mw6.0, respectively) Tyrnavos-Elassona earthquakes in northern Thessaly, Greece. Although the active faults in the area are very well studied, demonstrating typical geomorphic features that intensely affect the morphological relief, it seems that the earthquakes were produced by unknown faults emerging in the mountainous area (alpine basement). Primary (?) coseismic ruptures, however, were also observed northwards along the Titarissios valley. A geological interpretation of the faulting mechanism is also …

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Geothermal Reservoir Rocks Of The Büyük Menderes Graben (Turkey): Stratigraphiccorrelation By A Multiproxy Approach, Dorothee Siefert, Markus Wolfgramm, Thomas Koelbel, Johannes Glodny, Jochen Kolb, Elisabeth Eiche Jan 2021

Geothermal Reservoir Rocks Of The Büyük Menderes Graben (Turkey): Stratigraphiccorrelation By A Multiproxy Approach, Dorothee Siefert, Markus Wolfgramm, Thomas Koelbel, Johannes Glodny, Jochen Kolb, Elisabeth Eiche

Turkish Journal of Earth Sciences

This paper focuses on the correlation of two different marble units from an approximately 3,900 m deep geothermal exploration well (GP-1) in western Turkey by petrographical and geochemical data. Future geothermal exploration drilling in that area will benefit from a better (tectono) stratigraphic correlation and a better definition of the reservoir geometry in the basin. It is an innovative approximation in many settings to correctly correlate marble units without clear stratigraphic markers or fossil record, in particular, when sample material is restricted to cuttings. The most distinctive petrographical and geochemical properties in this study are colour, light transmission along with …

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High Heat Generating Granites Of Kestanbol: Future Enhanced Geothermal System (Egs)Province In Western Anatolia, Dornadula Chandrasekharam, Alper Baba Jan 2021

High Heat Generating Granites Of Kestanbol: Future Enhanced Geothermal System (Egs)Province In Western Anatolia, Dornadula Chandrasekharam, Alper Baba

Turkish Journal of Earth Sciences

Although the western Anatolian region is a foci for hydrothermal systems, this region has several high heat-generating granitic intrusive bodies that qualify to be candidates for enhanced geothermal systems (EGS). Considering the future energy requirement, carbon dioxide emissions reduction strategies, food, and water security issues, these granites appear to be the future clean energy source for the country. One such granite intrusive is located in the Kestanbol area in the western Anatolian region. The radioactive heat generation of this 28 Ma old granite varies from 5.25 to 10.38 μW/m3 with a heat flow of 92.47 to 128.61 mW/m 2. These …

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Seismic Velocity Characterisation And Survey Design To Assess Co2 Injection Performanceat Kızıldere Geothermal Field, Mahmut Parlaktuna, Şevket Durucan, Burak Parlaktuna, Çağlar Sinayuç, Martijn T.G. Janssen, Erdi̇nç Şentürk, Eri̇nç Tonğiç, Öncü Demi̇rci̇oğlu, Flavio Poletto, Gualtiero Bohm, Cinzia Bellezza, Biancamaria Farina Jan 2021

Seismic Velocity Characterisation And Survey Design To Assess Co2 Injection Performanceat Kızıldere Geothermal Field, Mahmut Parlaktuna, Şevket Durucan, Burak Parlaktuna, Çağlar Sinayuç, Martijn T.G. Janssen, Erdi̇nç Şentürk, Eri̇nç Tonğiç, Öncü Demi̇rci̇oğlu, Flavio Poletto, Gualtiero Bohm, Cinzia Bellezza, Biancamaria Farina

Turkish Journal of Earth Sciences

The noncondensable gases in most geothermal resources include CO2 and smaller amounts of other gases. Currently, the worldwide geothermal power is a small sector within the energy industry, and CO2 emissions related to the utilisation of geothermal resources are consequently small. In some countries, however, such as Turkey and Iceland, geothermal energy production contributes significantly to their energy budget, and their CO2 emissions are relatively significant. SUCCEED is a targeted innovation and research project, which aims to investigate the reinjection of CO2 produced at geothermal power production sites and develop, test, and demonstrate at field scale innovative measurement, monitoring and …

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Harcourt Granite Scco2 Water Interaction: A Laboratory Study Of Reactivity Andmodelling Of Hydrogeochemical Processes, Badulla Liyanage Avanthi Isaka, Ranjith Pathegama Gamage Jan 2021

Harcourt Granite Scco2 Water Interaction: A Laboratory Study Of Reactivity Andmodelling Of Hydrogeochemical Processes, Badulla Liyanage Avanthi Isaka, Ranjith Pathegama Gamage

Turkish Journal of Earth Sciences

Batch-type laboratory reactivity experiments and modelling of hydrogeochemical interactions of a granite-scCO2-water system were conducted at 100 °C and 10 MPa in order to evaluate the geochemical and mineralogical responses of the granite to long-term reaction. The laboratory reactivity tests were conducted for a total duration of 70 days, and the continued hydrogeochemical interactions for up to 210 days were determined by geochemical simulations. The reacted granite powder and the residual solutions were subjected to several analytical techniques, including inductively-coupled plasma optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), scanning electron microscopy (SEM) and pH measurements, in order to characterise the …

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Numerical Modeling Of Fluid Flow And Heat Transfer In Kurşunlu Geothermal Field-Kgf(Salihli, Manisa / Turkey), Ali̇ Toygar Akar, Ünsal Gemi̇ci̇, Adi̇le Meli̇s Somay Altaş, Gülteki̇n Tarcan Jan 2021

Numerical Modeling Of Fluid Flow And Heat Transfer In Kurşunlu Geothermal Field-Kgf(Salihli, Manisa / Turkey), Ali̇ Toygar Akar, Ünsal Gemi̇ci̇, Adi̇le Meli̇s Somay Altaş, Gülteki̇n Tarcan

Turkish Journal of Earth Sciences

Nowadays, the need for energy is increasing more and more. It is more difficult to acquire new resources in various fields than to preserve existing energy resources. Although Turkey is a very rich state in terms of various energy resources, misuse of these resources can even lead to conflicts that may occur between the states in forthcoming years. In today's economic conditions, we can only protect our energy resources with the correct way of management. In this context, it is very important to reveal the mechanisms that make up the geothermal systems, which are very common in Western Anatolia. In …

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Simulation And Parametric Study On A Novel Modified Kalina Cycle, Guobin Lei, Jun Zhou, Shengchao Shi, Fuzhi Qi, Jiawei Xu, Jie Peng, Jiaqi Zhang, Dongxi Liu, Qingyao Meng Jan 2021

Simulation And Parametric Study On A Novel Modified Kalina Cycle, Guobin Lei, Jun Zhou, Shengchao Shi, Fuzhi Qi, Jiawei Xu, Jie Peng, Jiaqi Zhang, Dongxi Liu, Qingyao Meng

Turkish Journal of Earth Sciences

To improve the utilization rate of hot dry rock resources, it is necessary to recover the energy of geothermal tailwater and improve the net output work. An improved ammonia-water power cycle is proposed based on the Kalina cycle. Taking the geothermal parameters of the Husavik Power Plant in Iceland as the prototype (the water temperature of the geothermal well is 122 °C, and the tailwater temperature is 80 °C), the numerical simulation of the modified Kalina cycle is carried out by using Engineering Equation Solver software. The result shows that the net power output of the modified Kalina cycle increases …

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Use Of Geothermal Resources In Konya Plain Project (Kop) Region For Tourism, Healthpurposes, Agricultural, Industrial And Distict Heating, Bariş Çarikci, Merve Sefa, Kevser Akmaz, Ayşe Kandemi̇r, Feza Şen, Hasan Hüseyi̇n Öztürk Jan 2021

Use Of Geothermal Resources In Konya Plain Project (Kop) Region For Tourism, Healthpurposes, Agricultural, Industrial And Distict Heating, Bariş Çarikci, Merve Sefa, Kevser Akmaz, Ayşe Kandemi̇r, Feza Şen, Hasan Hüseyi̇n Öztürk

Turkish Journal of Earth Sciences

This study has been prepared in accordance with the objectives of evaluating and developing geothermal resources in order to bring the geothermal resources in the Konya Plain Project (KOP) Region, which includes Aksaray, Kırşehir, Konya, Nevşehir, Niğde and Yozgat provinces, to the country?s economy with maximum capacity, and to develop proposals for investments to be made. The number of overnight stays and the number of tourists outside the region should be increased by utilizing alternative tourism opportunities in the region. Their use in terms of geothermal energy, tourism and health has an important investment and income potential for the region. …

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Grey Water Footprint Assessment Of Geothermal Water Resources In The Southeasternanatolia Region, Peli̇n Yapicioğlu, Mehmet İrfan Yeşi̇lnacar Jan 2021

Grey Water Footprint Assessment Of Geothermal Water Resources In The Southeasternanatolia Region, Peli̇n Yapicioğlu, Mehmet İrfan Yeşi̇lnacar

Turkish Journal of Earth Sciences

This paper aimed to determine the grey water footprint (GWF) of geothermal water resources and to investigate the effect of biochar adsorption on grey water footprint in Southeastern Turkey. In this paper, GWF has been calculated in terms of iron (Fe), arsenic (As), manganese (Mn), boron (B), and chrome (Cr) concentrations for fifteen observation geothermal resources located in Southeastern Anatolia Region. In this study, a new approach based on the GWF was developed in order to determine the geothermal water pollution. Grey water footprints related to fifteen geothermal resources were investigated. In the second stage of the study, the effect …

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Lithium Extraction From Geothermal Waters; A Case Study Of Ömer-Gecek(Afyonkarahisar) Geothermal Area, Muhammed Fati̇h Can, Can Başaran, Ahmet Yildiz, Müfi̇t Demi̇rkapi Jan 2021

Lithium Extraction From Geothermal Waters; A Case Study Of Ömer-Gecek(Afyonkarahisar) Geothermal Area, Muhammed Fati̇h Can, Can Başaran, Ahmet Yildiz, Müfi̇t Demi̇rkapi

Turkish Journal of Earth Sciences

Lithium (Li) is the lightest metal, has unique physicochemical properties and is the main component of lithium-ion batteries. Rechargeable lithium-ion batteries play a very important role in maximizing the performance of electric devices and vehicles. It is predicted that the metal and mineral demand for lithium-ion batteries will increase 56 times by 2050. In order to meet the increasing demand, in addition to known methods, lithium recovery from geothermal waters has become a very popular research subject. There are abundant geothermal water resources in the world, especially in Turkey and in Afyonkarahisar. The aim of this study is to produce …

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Pesticide Occurrence And Persistence Entering Recreational Lakes In Watersheds Of Varying Land Uses, Jessica Satiroff, Tiffany Messer, Aaron R. Mittelstet, Daniel D. Snow Jan 2021

Pesticide Occurrence And Persistence Entering Recreational Lakes In Watersheds Of Varying Land Uses, Jessica Satiroff, Tiffany Messer, Aaron R. Mittelstet, Daniel D. Snow

Nebraska Water Center: Faculty Publications

Currently little is known of newer pesticide classes and their occurrence and persistence in recreational lakes. Therefore, the objectives of this study were to (1) assess average pesticide concentrations and loadings entering recreational lakes in three mixed land use watersheds throughout the growing season, (2) evaluate pesticide persistence longitudinally within the lakes, and (3) perform an ecotoxicity assessment. Six sampling campaigns were conducted at three lakes from April through October 2018 to measure the occurrence and persistence during pre, middle, and post growing season. Polar organic chemical integrative samplers (POCIS) were placed in streams near lake inlets and monthly samples …

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Occurrence Of Arsenite In Surface And Groundwater Associated With A Perennial Stream Located In Western Nebraska, Usa, Arindam Malakar, Rajesh Singh, Jeffrey Westrop, Karrie A. Weber, Christopher N. Elofson, Manish Kumar, Daniel D. Snow Jan 2021

Occurrence Of Arsenite In Surface And Groundwater Associated With A Perennial Stream Located In Western Nebraska, Usa, Arindam Malakar, Rajesh Singh, Jeffrey Westrop, Karrie A. Weber, Christopher N. Elofson, Manish Kumar, Daniel D. Snow

Nebraska Water Center: Faculty Publications

Dissolved arsenic typically results from chemical weathering of arsenic rich sediments and is most often found in oxidized forms in surface water. The mobility of arsenic is controlled by its valence state and also by its association with iron oxides minerals, the forms of which are both influenced by abiotic and biotic processes in aqueous environment. In this study, speciation methods were used to measure and confirm the presence of reduced arsenic species in the surface water of Frenchman creek, a gaining stream that crosses the Colorado- Nebraska border. Selective extraction analysis of aquifer and stream bed sediments shows that …

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Droughtscape, Winter 2021, National Drought Mitigation Center Jan 2021

Droughtscape, Winter 2021, National Drought Mitigation Center

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

DroughtScape, Winter 2021

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Microstructural And Microchemical Studies Of Fluid–Chondrule Interactions In A Pristine Cr Carbonaceous Chondrite And Apatite In Martian Nakhlites, Marina Martínez Jan 2021

Microstructural And Microchemical Studies Of Fluid–Chondrule Interactions In A Pristine Cr Carbonaceous Chondrite And Apatite In Martian Nakhlites, Marina Martínez

Earth and Planetary Sciences ETDs

PROJECT 1: Chondrites are the most primitive objects in the solar system, aggregates of the material that formed in the solar protoplanetary disk during the first 1-5 million years of its formation. However, petrographic observations indicate that most chondrites have been modified by secondary processes, including aqueous alteration, thermal metamorphism, and shock. Fortunately, a few chondrites largely escaped these processes and are considered pristine, such as the CR carbonaceous chondrite Queen Alexandra Range (QUE) 99177. QUE 99177 is an excellent sample for deciphering information about the reactions that took place between unaltered anhydrous solar nebular components and water under highly …

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Compiled Dataset From The National Reservoir Research Program 1989 Dataset, Nicky M. Faucheux, Leandro E. Miranda Jan 2021

Compiled Dataset From The National Reservoir Research Program 1989 Dataset, Nicky M. Faucheux, Leandro E. Miranda

CFR Publications

This dataset was compiled from the National Reservoir Research Program 1989 dataset. The NRRP dataset includes data from rotenone and creel studies at reservoirs throughout the continental US during the 1980s. We compiled the species level biomass data into total biomass for each of five trophic guilds (piscivores, detritivores, herbivores, invertivores, and planktivores). This compiled dataset was used to investigate the Cascading Reservoir Continuum Concept across 16 river basins in a study conducted by the 2020 Management of Impounded Rivers Class.

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Environmental Controls On The Spatial Distribution Of Greenfin Darters And Biodiversity In The Blue Ridge Mountains, Dri Tattersfield Jan 2021

Environmental Controls On The Spatial Distribution Of Greenfin Darters And Biodiversity In The Blue Ridge Mountains, Dri Tattersfield

CMC Senior Theses

Disproportionate concentrations of biodiversity in mountains worldwide suggest linkages between geologic processes and biodiversity that are not yet well understood. The Tennessee River Basin in the Blue Ridge Mountains of the southeastern U.S. is a global hotspot for freshwater fish biodiversity. To investigate drivers of biodiversity in the Tennessee River Basin, and explore links to geologic processes, I study the Greenfin Darter (Nothonotus chlorobranchius), a small fish endemic to the upper Tennessee River Basin. I use generalized linear models (GLMs) to evaluate the influence of topography, lithology, climate and land use on the distribution of the Greenfin Darter, …

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College Of Natural Sciences 2021 Year-End Publication, College Of Natural Sciences Jan 2021

College Of Natural Sciences 2021 Year-End Publication, College Of Natural Sciences

College of Natural Sciences Newsletters and Reports

Page 2 Welcome, Table of Contents
Page 3 Our Departments: Highlights From 2021
Page 4 Overview of the College
Page 5 Overview of Bold & Blue
Pages 6, 7 Announcing the First Endowed Professorship in the College of Natural Sciences
Page 8 Spooky Science, Astronomy Outreach, SDSU Chemistry Research Features on Journal Cover
Page 9 Students Win Business Plan Competition With Aims to Improve Shelf Life of Produce, Summer Researchers
Page 10 NIH Grant Helps Unravel Rare Inflammatory Genetic Disorders, International Excellence in South Dakota
Page 11 The Next Frontier of Science Education: Virtual Reality, SDSU Researchers Uncover how Cancer …

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Adequately Reflecting The Severity Of Tropical Cyclones Using The New Tropical Cyclone Severity Scale, Nadia Bloemendaal, Hans De Moel, Jantsje M. Mol, Priscilla R.M. Bosma, Amy Polen, Jennifer M. Collins Jan 2021

Adequately Reflecting The Severity Of Tropical Cyclones Using The New Tropical Cyclone Severity Scale, Nadia Bloemendaal, Hans De Moel, Jantsje M. Mol, Priscilla R.M. Bosma, Amy Polen, Jennifer M. Collins

School of Geosciences Faculty and Staff Publications

For decades, meteorologists and governments have been warning communities in coastal areas for an imminent tropical cyclone (TC) using the Saffir-Simpson Hurricane Wind Scale (SSHWS). The SSHWS categorizes a TC based on its maximum wind speed, and is used in defining evacuation strategies and humanitarian response. However, the SSHWS considers only the wind hazard of a TC, whereas a TC can also cause severe conditions through its high storm surges and extreme rainfall, triggering coastal and inland flooding. Consequently, the SSHWS fails to mirror the TC's total severity. This becomes evident when looking at past events such as Hurricane Harvey …

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Magma Source Evolution Following Subduction Initiation: Evidence From The Element Concentrations, Stable Isotope Ratios, And Water Contents Of Volcanic Glasses From The Bonin Forearc (Iodp Expedition 352), Daniel A. Coulthard, Mark K. Reagan, Kenji Shimizu, Ilya N. Bindeman, Maryjo Brounce, Renat R. Almeev, Jeffrey Ryan, Timothy Chapman, John Shervais, Julian A. Pearce Jan 2021

Magma Source Evolution Following Subduction Initiation: Evidence From The Element Concentrations, Stable Isotope Ratios, And Water Contents Of Volcanic Glasses From The Bonin Forearc (Iodp Expedition 352), Daniel A. Coulthard, Mark K. Reagan, Kenji Shimizu, Ilya N. Bindeman, Maryjo Brounce, Renat R. Almeev, Jeffrey Ryan, Timothy Chapman, John Shervais, Julian A. Pearce

School of Geosciences Faculty and Staff Publications

International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic glasses collected during this expedition were analyzed for major and trace elements, halogens, sulfur, and H and O isotopes with goals of characterizing the fluids and melts of subducted materials that were involved in generating the nascent upper plate crust. Incompatible trace element compositions of the oldest lavas (forearc basalts [FAB]) are similar to those of the most depleted mid‐ocean ridge basalts globally. Most FAB were …

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Formation Mechanisms Of Macroscopic Globules In Andesitic Glasses From The Izu–Bonin–Mariana Forearc (Iodp Expedition 352), Raúl O.C. Fonseca, Lina T. Michely, Maria Kirchenbaur, Julie Prytulak, Jeffrey Ryan, Kerstin Hauke, Felipe P. Leitzke, Renat R. Almeev, Chris S. Marien, Axel Gerdes, Rico Schellhorn Jan 2021

Formation Mechanisms Of Macroscopic Globules In Andesitic Glasses From The Izu–Bonin–Mariana Forearc (Iodp Expedition 352), Raúl O.C. Fonseca, Lina T. Michely, Maria Kirchenbaur, Julie Prytulak, Jeffrey Ryan, Kerstin Hauke, Felipe P. Leitzke, Renat R. Almeev, Chris S. Marien, Axel Gerdes, Rico Schellhorn

School of Geosciences Faculty and Staff Publications

The Izu–Bonin–Mariana volcanic arc is situated at a convergent plate margin where subduction initiation triggered the formation of MORB-like forearc basalts as a result of decompression melting and near-trench spreading. International Ocean Discovery Program (IODP) Expedition 352 recovered samples within the forearc basalt stratigraphy that contained unusual macroscopic globular textures hosted in andesitic glass (Unit 6, Hole 1440B). It is unclear how these andesites, which are unique in a stratigraphic sequence dominated by forearc basalts, and the globular textures therein may have formed. Here, we present detailed textural evidence, major and trace element analysis, as well as B and Sr …

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Machine Learning Approaches To Identifying Changes In Eruptive State Using Multi-Parameter Datasets From The 2006 Eruption Of Augustine Volcano, Alaska, Grace F. Manley, Tamsin A. Mather, David M. Pyle, David A. Clifton, Mel Rodgers, Glenn Thompson, Diana C. Roman Jan 2021

Machine Learning Approaches To Identifying Changes In Eruptive State Using Multi-Parameter Datasets From The 2006 Eruption Of Augustine Volcano, Alaska, Grace F. Manley, Tamsin A. Mather, David M. Pyle, David A. Clifton, Mel Rodgers, Glenn Thompson, Diana C. Roman

School of Geosciences Faculty and Staff Publications

Understanding the timing of critical changes in volcanic systems, such as the beginning and end of eruptive behavior, is a key goal of volcanic monitoring. Traditional approaches to forecasting these changes have used models motivated by the underlying physics of eruption onset, which assume that geophysical precursors will consistently display similar patterns prior to transition in volcanic state. We present a machine learning classification approach for detecting significant changes in patterns of volcanic activity, potentially signaling transitions during the onset or end of volcanic activity, which does not require a model of the physical processes underlying critical changes. We apply …

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Exploring Best Practices In Geoscience Education: Adapting A Video/Animation On Continental Rifting For Upper-Division Students To A Lower-Division Audience, Siloa Willis, Robert J. Stern, Jeffrey Ryan, Christy Bebeau Jan 2021

Exploring Best Practices In Geoscience Education: Adapting A Video/Animation On Continental Rifting For Upper-Division Students To A Lower-Division Audience, Siloa Willis, Robert J. Stern, Jeffrey Ryan, Christy Bebeau

School of Geosciences Faculty and Staff Publications

Well-crafted and scientifically accurate videos and animations can be effective ways to teach dynamic Earth processes such as continental rifting, both in live course offerings as well as in online settings. However, a quick search of the internet reveals too few high-quality videos/animations describing deep Earth processes. We have modified a hybrid 10.5 min video/animation about continental rifting and the formation of new oceans and passive continental margins created for an upper-division geology audience, retailoring it for a lower-division geology audience. A key challenge in successfully modifying such resources is aligning the cognitive load that the video/animation imposes on students, …

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Monochromatic Long-Period Seismicity Prior To The 2012 Earthquake Swarm At Little Sitkin Volcano, Alaska, Matthew M. Haney, Helena Buurman, Stephen Holtkamp, Stephen R. Mcnutt Jan 2021

Monochromatic Long-Period Seismicity Prior To The 2012 Earthquake Swarm At Little Sitkin Volcano, Alaska, Matthew M. Haney, Helena Buurman, Stephen Holtkamp, Stephen R. Mcnutt

School of Geosciences Faculty and Staff Publications

Detection of the earliest stages of unrest is one of the most challenging and yet critically needed aspects of volcano monitoring. We investigate a sequence of five unusual long-period (LP) earthquakes that occurred in the days prior to the onset of a months-long volcano-tectonic (VT) earthquake swarm beneath Little Sitkin volcano in the Aleutian Islands during late 2012. The long-period earthquakes had two distinctive characteristics: their signals were dominated by a monochromatic spectral peak at approximately 0.57 Hz and they had impulsive P and S-wave arrivals on a seismometer located on Amchitka Island 80 km to the southeast of the …

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Assessment Of Tidal Range Changes In The North Sea From 1958 To 2014, Leon Jänicke, Andra Ebener, Sönke Dangendorf, Arne Arns, Michael Schindelegger, Sebastian Niehüser, Ivan D. Haigh, Philip Woodworth, Jürgen Jensen Jan 2021

Assessment Of Tidal Range Changes In The North Sea From 1958 To 2014, Leon Jänicke, Andra Ebener, Sönke Dangendorf, Arne Arns, Michael Schindelegger, Sebastian Niehüser, Ivan D. Haigh, Philip Woodworth, Jürgen Jensen

CCPO Publications

We document an exceptional large-spatial scale case of changes in tidal range in the North Sea, featuring pronounced trends between -2.3 mm/yr at tide gauges in the United Kingdom and up to 7 mm/yr in the German Bight between 1958 and 2014. These changes are spatially heterogeneous and driven by a superposition of local and large-scale processes within the basin. We use principal component analysis to separate large-scale signals appearing coherently over multiple stations from rather localized changes. We identify two leading principal components (PCs) that explain about 69% of tidal range changes in the entire North Sea including the …

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A Karst Feature Prediction Model For Prince Of Wales Island, Alaska Based On High Resolution Lidar Imagery, Alexander Lyles Jan 2021

A Karst Feature Prediction Model For Prince Of Wales Island, Alaska Based On High Resolution Lidar Imagery, Alexander Lyles

Master's Theses or Doctor of Nursing Practice

Investigation into surface karst formation is significant to hazard prediction, hydrogeologic drainage, and land management. Southeast Alaska contains over 600,000 acres of mapped carbonate bedrock, and some of the fastest recorded karst dissolution in the world. The objectives of this study are to develop and compare multiple semi-automated models to map and delineate karst features from bare-earth LiDAR imagery using ArcGIS Desktop 10.7, and to apply a preliminary geostatistical analysis of sinkhole morphometric parameters to highlight potential spatial patterns of karst evolution on Prince of Wales Island, Alaska. A semi-automated approach of mapping karst features provides a dataset that minimizes …

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Ecological Controls On The Campanian Distribution Of Hesperornis (Aves: Hesperornithiformes) In The Western Interior Seaway, Blake Chapman Jan 2021

Ecological Controls On The Campanian Distribution Of Hesperornis (Aves: Hesperornithiformes) In The Western Interior Seaway, Blake Chapman

Master's Theses or Doctor of Nursing Practice

The epicontinental Western Interior Seaway (WIS) of Late Cretaceous North America provided a unique marine habitat for cephalopods, fish, marine reptiles, and the foot-propelled diving seabird Hesperornis. While several predator-prey relationships among Hesperornis or other hesperornithiforms and other WIS animals have been hypothesized based on gut contents, bite marks, and coprolites/colonites, ecological relationships have not been quantitatively tested. Paleontological species distribution modeling (SDM) studies have focused on extinct non-marine taxa and marine invertebrates, with only two marine vertebrate studies of extant taxa. Here, two SDM methods were used to test the influence of vertebrate faunas, sedimentary rock type, paleogeography, …

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Policy Analysis Of Emissions Cap And Trade: The United State And The European Union, Drew Bealby Jan 2021

Policy Analysis Of Emissions Cap And Trade: The United State And The European Union, Drew Bealby

Master's Theses or Doctor of Nursing Practice

Effects of climate change are appearing each day therefore proactive steps need to be made to reduce these effects. The National Aeronautics and Space Administration (NASA) notes that humans producing greenhouse gases (GHGs) such as carbon dioxide (CO2), methane, and nitrous oxide are the main reason the Earth’s overall temperature is rising (NASA 2019). A policy analysis was done on the European Union Emissions Trading Scheme (EU ETS) along with comparisons to the United States’ emissions policies that are in place currently. The European Union (E.U.) itself is both an economic and political union of 27 countries in …

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Elevating Dissolved Oxygen—Reflections On Developing And Using Long-Term Data, Nancy N. Rabalais Jan 2021

Elevating Dissolved Oxygen—Reflections On Developing And Using Long-Term Data, Nancy N. Rabalais

Gulf and Caribbean Research

This prospectus took me about as long to generate as my 36—year record of working on the issue of northern Gulf of Mexico (nGOM) oxygen deficiency, or so I felt. There was so much to cover, but I focused on the issue of hypoxia on the Louisiana continental shelf from the early 1980s to present and my participation in the research and outreach. Not that I was ignoring other aspects of my academic research career (e.g., stone crab populations and their differences in physiology and larval development along the nGOM coast; settlement of crab megalopae, especially blue crabs, on artificial …

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