Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Earth Sciences (6)
- Geophysics and Seismology (6)
- Physical Sciences and Mathematics (6)
- Geology (4)
- Engineering (2)
-
- Glaciology (2)
- Ancient History, Greek and Roman through Late Antiquity (1)
- Anthropology (1)
- Archaeological Anthropology (1)
- Arts and Humanities (1)
- Civil Engineering (1)
- Civil and Environmental Engineering (1)
- Classics (1)
- Geological Engineering (1)
- Geomorphology (1)
- Geotechnical Engineering (1)
- History of Art, Architecture, and Archaeology (1)
- Indigenous Studies (1)
- Race, Ethnicity and Post-Colonial Studies (1)
- Sedimentology (1)
- Social and Behavioral Sciences (1)
- Structural Engineering (1)
- Institution
- Publication
Articles 1 - 11 of 11
Full-Text Articles in Entire DC Network
Utilizing The Hvsr Second Peak For Surface Wave Inversions In The Mississippi Embayment, Ashraf Kamal Himel
Utilizing The Hvsr Second Peak For Surface Wave Inversions In The Mississippi Embayment, Ashraf Kamal Himel
Graduate Theses and Dissertations
Ambient noise data from 24 sites within the Mississippi Embayment were analyzed to estimate the fundamental frequency using the horizontal to vertical spectral ratio (HVSR) method. The fundamental frequency ranged from 0.17 to 3.43 Hz for the tested sites. At seventeen of the sites, a second higher frequency HVSR peak, which ranged from 0.617 Hz to 2.154 Hz, was observed in addition to the fundamental HVSR peak. The second peak frequency in the HVSR curve has been attributed by previous researchers as either an odd harmonic of the fundamental peak or a shallow impedance contrast from the Memphis sand layer …
Holocene Formation And Evolution Of Horn Island, Mississippi, Usa, Nina Gal
Holocene Formation And Evolution Of Horn Island, Mississippi, Usa, Nina Gal
Master's Theses
Horn Island, one of the most stable barriers along the Mississippi-Alabama chain, provides critical habitat, helps regulate estuarine conditions in the Mississippi Sound, and reduces wave energy and storm surge for the mainland. This study integrates 2,200 km of high-resolution geophysics, 35 sediment cores, and 15 radiocarbon ages to better understand the formation and evolution of the island in response to sea-level rise, storms, and antecedent geology. The Biloxi and Pascagoula incised valleys converge at Horn Island and have played a profound role in the evolution of the system. Within the incised valleys, numerous shallow paleochannels between 4 and 9 …
Characterizing Spatial And Temporal Changes And Driving Factors Of Groundwater And Surface-Water Interactions Within The Mississippi Portion Of The Mississippi Alluvial Plain, Courtney Killian
Theses and Dissertations
The Mississippi Alluvial Plain, a robust agricultural region in the South-Central United States, provides commodities across the United States and around the world. Water for irrigation, which is necessary due to irregular rainfall patterns during the growing season, is withdrawn largely from the Mississippi River Valley Alluvial aquifer, one of the most intensely used aquifers in the United States. The groundwater-dependent region has observed recent declines in groundwater and streamflow levels, raising concerns about the availability and use of fresh-water resources. Declining water levels have prompted investigation into the current understanding of groundwater and surface-water interaction. Previous research does not …
Dynamic Rupture Modeling Of Induced Earthquakes In Oklahoma, Elizabeth Ann Gilmour
Dynamic Rupture Modeling Of Induced Earthquakes In Oklahoma, Elizabeth Ann Gilmour
Electronic Theses and Dissertations
Since 2008, seismicity has increased in Oklahoma due to high-volume fluid injection. We examine the impact of pore pressure and tectonic factors on the magnitude and the potential for larger earthquakes Dynamic rupture models are performed on 10 km faults with varying input parameters. A neural network trained to approximate the results of the models predicts the moment magnitude of a rupture with 74% accuracy. Fault roughness and normal stresses are negatively correlated with moment magnitude, while the pore pressure has no correlation. We use the trained neural network with a Markov Chain Monte Carlo (MCMC) to find distributions of …
Detection Of Bedrock Fractures And Joints Beneath Cover: Geophysical Approaches To An Engineering Geology Problem, Muthanna Yousif Yaqoob Aldiney
Detection Of Bedrock Fractures And Joints Beneath Cover: Geophysical Approaches To An Engineering Geology Problem, Muthanna Yousif Yaqoob Aldiney
Dissertations
This research used geophysical methods to detect the presence of sub-vertical failure planes, their direction(s), and their frequency in bedrock beneath soil or glacial drift overburden. Azimuthal measurements using the seismic, electrical resistivity (ER), and electromagnetic conductivity were made to evaluate which techniques might provide the best indication of the bedrock joints, faults, or shear zones. Measurements were made at multiple sites near each of three locations: Jackson, Alpena, and Grand Ledge, Michigan. The first two are former limestone quarries and the third is underlain by sandstone. Seismic measurements began with one or two linear refraction spreads, used to establish …
Earthen Monuments And Social Movements In Eastern North America: Adena-Hopewell Enclosures On Kentucky’S Bluegrass Landscape, Edward Ross Henry
Earthen Monuments And Social Movements In Eastern North America: Adena-Hopewell Enclosures On Kentucky’S Bluegrass Landscape, Edward Ross Henry
Arts & Sciences Electronic Theses and Dissertations
Geometric earthen enclosures are some of the best known pre-Columbian monuments in North America. Across the Eastern Woodlands, many have been preserved as state and national parks. However, their chronological placement is poorly understood as they relate to the rise of complex social behaviors associated with the Adena-Hopewell florescence (500 BC–AD 500) in the Middle Ohio Valley. This is especially true for communities who built smaller enclosures referred to by archaeologists as ‘scared circles’. To better understand the timing, tempo, and nature of their construction I examined the Bluegrass Region in Central Kentucky using aerial and terrestrial remote sensing methods …
A Geophysical Delineation Of A Normal Fault Within The Gulf Coastal Plain, Montgomery County, Texas, Danielle Minteer
A Geophysical Delineation Of A Normal Fault Within The Gulf Coastal Plain, Montgomery County, Texas, Danielle Minteer
Electronic Theses and Dissertations
The Gulf Coast of Texas has been a known hydrocarbon basin for many years with various structural trapping mechanisms such as anticlines, faults and salt domes. While most large salt domes have been extensively studied in the Gulf Coastal Plain, many smaller normal faults have not been studied in detail. This research study employs an integrated geophysical approach to mapping the Big Barn fault in Montgomery County, Texas. This fault is located on the Gulf Coastal Plain and is approximately 20 miles north of Houston, Texas. Most normal faults in the Gulf Coastal Plain formed as a result of the …
Mapping Bedrock Topography Of The Portage And Schoolcraft Nw 7.5’ Quadrangles, Kalamazoo Co. Mi, Using The Hvsr Passive Seismic Method, Benjamin B. Seiderman
Mapping Bedrock Topography Of The Portage And Schoolcraft Nw 7.5’ Quadrangles, Kalamazoo Co. Mi, Using The Hvsr Passive Seismic Method, Benjamin B. Seiderman
Masters Theses
This study utilizes the Horizontal to Vertical Spectral Ratio (HVSR) technique to map bedrock topography in the Portage and Schoolcraft NW quadrangles, Kalamazoo Co., MI, looking for buried bedrock valleys. Glacial sediment-landform assemblages dominate the study area, due to multiple advances of the Laurentide Ice Sheet (LIS). Tunnel valleys, which are one type of buried valley, are eroded by subglacial meltwater and commonly filled with the coarser varieties of glacial outwash, making them potential aquifers. The HVSR technique measures the ratio of horizontal to vertical ground motion, excited by ambient seismic noise, resulting in a peak at the resonance frequency. …
Geologic Mapping Of The Bronson North And Bronson South 7.5-Minute Quadrangles, Branch County, Michigan, Karl John Backhaus
Geologic Mapping Of The Bronson North And Bronson South 7.5-Minute Quadrangles, Branch County, Michigan, Karl John Backhaus
Masters Theses
This study contributes to a better understanding of the glacial history of southwest Michigan through detailed surficial geologic and bedrock topography mapping within the Bronson North and Bronson South Quadrangles in Branch County, Michigan. This project was supported during the summer of 2017 by the USGS EDMAP program in conjunction with the Michigan Geological Survey. Hand-auger borings, grain size analysis tests, passive seismic depth-to-bedrock measurements, and ground penetrating radar transects were collected for this study. There are 350 feet of bedrock relief from west to east across the quadrangles, including a bedrock cuesta of Mississippian Coldwater Shale. This cuesta underlies …
Pushing The Limits: Testing, Magnetometry And Ontario Lithic Scatters, John E. Dunlop
Pushing The Limits: Testing, Magnetometry And Ontario Lithic Scatters, John E. Dunlop
Electronic Thesis and Dissertation Repository
Lithic scatters, small ephemeral clusters of stone artifacts on cultivated surfaces, lie on the periphery of archaeology. These sites are often too ephemeral to be fully understood through standardized fieldwork methodologies mandated in Ontario CRM archaeology and yet, they are widely regarded as worth documenting with hundreds now recorded. In this thesis, it is argued that what are small artifact scatters on the surface can belie more complex subsurface finds of significant cultural and historical value. As such, there is a need to reconsider the approaches made to the investigation of these sites. Geophysical techniques applied early in a scatter’s …
Gis-Based Spatial Analysis Coupled With Geophysical Imaging To Identify And Evaluate Factors That Control The Formation Of Karst Sinkholes In Southwestern Missouri, Shishay T. Kidanu
Gis-Based Spatial Analysis Coupled With Geophysical Imaging To Identify And Evaluate Factors That Control The Formation Of Karst Sinkholes In Southwestern Missouri, Shishay T. Kidanu
Doctoral Dissertations
"Sinkholes are inherent features of the karst terrain underlying much of Greene County, Missouri. These features present hazards and engineering challenges to existing infrastructure unknowingly constructed on a seemingly benign ground surface. The primary objective of this research was to investigate the physical processes chiefly responsible for triggering the seemingly random distribution of sinkholes in the study area. This research employed an integrated approach encompassing regional scale GIS-based spatial analyses and site-specific geophysical data. GIS-based spatial analysis was employed to identify significant physical factors that appeared to influence the formation and distribution of sinkholes. Seven out of the twelve most …