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Articles 1 - 12 of 12
Full-Text Articles in Earth Sciences
Earthquake And Tsunami Forecasts: Relation Of Slow Slip Events To Subsequent Earthquake Rupture, Timothy H. Dixon, Yan Jiang, Rocco Malservisi, Robert Mccaffrey, Nicholas Voss, Marino Protti, Victor Gonzalez
Earthquake And Tsunami Forecasts: Relation Of Slow Slip Events To Subsequent Earthquake Rupture, Timothy H. Dixon, Yan Jiang, Rocco Malservisi, Robert Mccaffrey, Nicholas Voss, Marino Protti, Victor Gonzalez
School of Geosciences Faculty and Staff Publications
The 5 September 2012 Mw 7.6 earthquake on the Costa Rica subduction plate boundary followed a 62-y interseismic period. High-precision GPS recorded numerous slow slip events (SSEs) in the decade leading up to the earthquake, both up-dip and down-dip of seismic rupture. Deeper SSEs were larger than shallower ones and, if characteristic of the interseismic period, release most locking down-dip of the earthquake, limiting down-dip rupture and earthquake magnitude. Shallower SSEs were smaller, accounting for some but not all interseismic locking. One SSE occurred several months before the earthquake, but changes in Mohr–Coulomb failure stress were probably too small to …
Redox Chemistry In The Phosphorus Biogeochemical Cycle, Matthew A. Pasek, Jacqueline M. Sampson, Zachary Atlas
Redox Chemistry In The Phosphorus Biogeochemical Cycle, Matthew A. Pasek, Jacqueline M. Sampson, Zachary Atlas
School of Geosciences Faculty and Staff Publications
The element phosphorus (P) controls growth in many ecosystems as the limiting nutrient, where it is broadly considered to reside as pentavalent P in phosphate minerals and organic esters. Exceptions to pentavalent P include phosphine—PH3—a trace atmospheric gas, and phosphite and hypophosphite, P anions that have been detected recently in lightning strikes, eutrophic lakes, geothermal springs, and termite hindguts. Reduced oxidation state P compounds include the phosphonates, characterized by C−P bonds, which bear up to 25% of total organic dissolved phosphorus. Reduced P compounds have been considered to be rare; however, the microbial ability to use reduced P …
The Biogeochemical Cycling Of Zinc And Zinc Isotopes In The North Atlantic Ocean, Tim M. Conway, Seth G. John
The Biogeochemical Cycling Of Zinc And Zinc Isotopes In The North Atlantic Ocean, Tim M. Conway, Seth G. John
School of Geosciences Faculty and Staff Publications
Zinc (Zn) is a marine micronutrient, with an overall oceanic distribution mirroring the major macronutrients, especially silicate. Seawater Zn isotope ratios (δ66Zn) are a relatively new oceanographic parameter which may offer insights into the biogeochemical cycling of Zn. To date, the handful of published studies of seawater δ66Zn show the global deep ocean to be both remarkably homogeneous (approximately +0.5‰) and isotopically heavier than the marine sources of Zn (+0.1 to +0.3‰). Here we present the first high‐resolution oceanic section of δ66Zn, from the U.S. GEOTRACES GA03 North Atlantic Transect, from Lisbon to …
A Seasonally Modulated Earthquake Swarm Near Maupin, Oregon, Jochen Braunmiller, John L. Nabelek, Anne M. Trehu
A Seasonally Modulated Earthquake Swarm Near Maupin, Oregon, Jochen Braunmiller, John L. Nabelek, Anne M. Trehu
School of Geosciences Faculty and Staff Publications
From December 2006 to November 2011, the Pacific Northwest Seismic Network (PNSN) reported 467 earthquakes in a swarm 60 km east of Mt Hood near the town of Maupin, Oregon. The swarm included 20 MD ≥ 3.0 events, which account for over 80 per cent of the cumulative seismic moment release of the sequence. Relocation of 45 MD≥ 2.5 earthquakes and moment tensor analysis of nine 3.3 ≤ Mw ≤ 3.9 earthquakes reveals right-lateral strike-slip motion on a north-northwest trending, 70° west dipping, 1 km2 active fault patch at about 17 km depth. The swarm started …
Monitoring Powdery Mildew Of Winter Wheat By Using Moderate Resolution Multi-Temporal Satellite Imagery, Jingcheng Zhang, Ruiliang Pu, Lin Yuan, Jihua Wang, Wenjiang Huang, Guijun Yang
Monitoring Powdery Mildew Of Winter Wheat By Using Moderate Resolution Multi-Temporal Satellite Imagery, Jingcheng Zhang, Ruiliang Pu, Lin Yuan, Jihua Wang, Wenjiang Huang, Guijun Yang
School of Geosciences Faculty and Staff Publications
Powdery mildew is one of the most serious diseases that have a significant impact on the production of winter wheat. As an effective alternative to traditional sampling methods, remote sensing can be a useful tool in disease detection. This study attempted to use multi-temporal moderate resolution satellite-based data of surface reflectances in blue (B), green (G), red (R) and near infrared (NIR) bands from HJ-CCD (CCD sensor on Huanjing satellite) to monitor disease at a regional scale. In a suburban area in Beijing, China, an extensive field campaign for disease intensity survey was conducted at key growth stages of winter …
Organizing A Study Abroad Trip—A Faculty Perspective, Jennifer Collins
Organizing A Study Abroad Trip—A Faculty Perspective, Jennifer Collins
School of Geosciences Faculty and Staff Publications
No abstract provided.
Digital Dissection – Using Contrast‐Enhanced Computed Tomography Scanning To Elucidate Hard‐ And Soft‐Tissue Anatomy In The Common Buzzard Buteo Buteo, Stephan Lautenschlager, Jen A. Bright, Emily J. Rayfield
Digital Dissection – Using Contrast‐Enhanced Computed Tomography Scanning To Elucidate Hard‐ And Soft‐Tissue Anatomy In The Common Buzzard Buteo Buteo, Stephan Lautenschlager, Jen A. Bright, Emily J. Rayfield
School of Geosciences Faculty and Staff Publications
Gross dissection has a long history as a tool for the study of human or animal soft‐ and hard‐tissue anatomy. However, apart from being a time‐consuming and invasive method, dissection is often unsuitable for very small specimens and often cannot capture spatial relationships of the individual soft‐tissue structures. The handful of comprehensive studies on avian anatomy using traditional dissection techniques focus nearly exclusively on domestic birds, whereas raptorial birds, and in particular their cranial soft tissues, are essentially absent from the literature. Here, we digitally dissect, identify, and document the soft‐tissue anatomy of the Common Buzzard (Buteo buteo) …
Vhub: A Knowledge Management System To Facilitate Online Collaborative Volcano Modeling And Research, José L. Palma, Leah Courtland, Sylvain J. Charbonnier, Riccardo Tortini, Greg A. Valentine
Vhub: A Knowledge Management System To Facilitate Online Collaborative Volcano Modeling And Research, José L. Palma, Leah Courtland, Sylvain J. Charbonnier, Riccardo Tortini, Greg A. Valentine
School of Geosciences Faculty and Staff Publications
Knowledge of volcanic systems and the hazards they produce is rapidly advancing as internet resources become more readily accessible, new and more sensitive field techniques are developed, and ever greater amounts of data are collected. Such rapid advances drive the need for an online collaborative knowledge management system that enables the sharing of volcanological information, and modeling and analysis tools. Vhub (http://vhub.org) is a community cyberinfrastructure platform designed for collaboration in volcanology research, education, outreach, and discovery that complements existing volcano databases and other cyberinfrastructure projects. Vhub is unique in its functionality as a nucleus for the creation …
A Method For Estimating Ice Mass Loss From Relative Insar Observations: Application To The Vatnajökull Ice Cap, Iceland, Wenliang Zhao, Falk Amelung, Timothy H. Dixon, Shimon Wdowinski, Rocco Malservisi
A Method For Estimating Ice Mass Loss From Relative Insar Observations: Application To The Vatnajökull Ice Cap, Iceland, Wenliang Zhao, Falk Amelung, Timothy H. Dixon, Shimon Wdowinski, Rocco Malservisi
School of Geosciences Faculty and Staff Publications
We present a new method for estimating ice mass loss from glaciers and ice sheets using Interferometric Synthetic Aperture Radar (InSAR) time‐series data. We use a linear inversion method based on observations of nearby bedrock uplift and a solution for surface loading of an elastic half‐space. The method assumes that mass loss is focused on lower elevation terminal regions of the glacier or ice sheet, and that there is an exponential decrease in thinning rate toward the higher elevation interior. We apply the method to uplift rates between 1995 and 2009 near Vatnajökull, Iceland. The data reveal up to 13 …
Integrating People And Place: A Density-Based Measure For Assessing Accessibility To Opportunities, Mark Horner, Joni A. Downs
Integrating People And Place: A Density-Based Measure For Assessing Accessibility To Opportunities, Mark Horner, Joni A. Downs
School of Geosciences Faculty and Staff Publications
Mobile object analysis is a well-studied area of transportation and geographic information science (GIScience). Mobile objects may include people, animals, or vehicles. Time geography remains a key theoretical framework for understanding mobile objects' movement possibilities. Recent efforts have sought to develop probabilistic methods of time geography by exploring questions of data uncertainty, spatial representation, and other limitations of classical approaches. Along these lines, work has blended time geography and kernel density estimation in order to delineate the probable locations of mobile objects in both continuous and discrete network space. This suite of techniques is known as time geographic density estimation …
City Of Tampa Urban Forest Management, Monitoring And Policy, Shawn M. Landry, Robert J. Northrop, Michael G. Andreu, Kathy Beck
City Of Tampa Urban Forest Management, Monitoring And Policy, Shawn M. Landry, Robert J. Northrop, Michael G. Andreu, Kathy Beck
School of Geosciences Faculty and Staff Publications
No abstract provided.
Searching For Cold-Adapted Microorganisms In The Underground Glacier Of Scarisoara Ice Cave, Romania, Alexandra Maria Hillebrand-Voiculescu, Corina Itcus, Ioan Ardelean, Denisa Pascu, Aurel Persoiu, Andreea Rusu, Traian Brad, Elena Popa, Bogdan P. Onac, Christina Purcarea
Searching For Cold-Adapted Microorganisms In The Underground Glacier Of Scarisoara Ice Cave, Romania, Alexandra Maria Hillebrand-Voiculescu, Corina Itcus, Ioan Ardelean, Denisa Pascu, Aurel Persoiu, Andreea Rusu, Traian Brad, Elena Popa, Bogdan P. Onac, Christina Purcarea
School of Geosciences Faculty and Staff Publications
Scarisoara Ice Cave (Romania) hosts one of world’s largest and oldest underground glacier. While no studies were carried out on the existence of microorganisms in this cave’s ice block, our interest is to investigate the presence of microorganisms and their chronological distribution in the cave’s subterranean ice in relationship with past climatic changes. Samples were collected from ice layers of different age (from present to ~900 cal. yrs. BP), and the diversity of embedded microbial communities was assessed by classical cultivation and molecular techniques. The microorganisms from icesediments were cultivated at 4 °C and 15 °C, in the presence and …