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Articles 31 - 33 of 33
Full-Text Articles in Entire DC Network
The Role Of Geology And Engineering Properties Of The Gettysburg Formation In The Geomorphic Form Of The Susquehanna River At Highspire, Pennsylvania., Joan L. Hawk
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Gettysburg Formation preserves the sedimentological record of the Late Triassic – Early Jurassic filling of the Newark-Narrow Neck-Gettysburg rift basin and subsequent intrusion by diabase. In the study area, bedrock is exposed only on the floor of the Susquehanna River. Exploratory borings drilled across the river, as part of a geotechnical investigation to obtain data for design of a foundation system for a replacement of the existing bridge carrying the Pennsylvania Turnpike (S.R. 0076) over the Susquehanna River, provided an opportunity to document the general stratigraphy of the surficial materials and the Gettysburg Formation in areas inaccessible to previous …
Structural Geometry Of The Jura-Cretaceous Rift Of The Middle Magdalena Valley Basin, Colombia., Luisa F. Rolon
Structural Geometry Of The Jura-Cretaceous Rift Of The Middle Magdalena Valley Basin, Colombia., Luisa F. Rolon
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Middle Magdalena Valley (MMV) basin, Colombia, evolved to its actual configuration through several stages closely linked with the tectonic events of the northwest corner of South America. Early Jurassic extensional deformation related to the break-up of Pangea, resulted in the development of rift structures in the MMV basin area. The syn-rift infill consists of fluvial and lacustrine sedimentary rocks (Jordán, Girón and Santos formations), overlain by limestones and shales (Basal Lime Group). Irregular discontinuous reflectors, rotated by normal faults and increasing thickness towards the south-east, characterize the Jurassic syn-rift section. In Early Aptian, a post-rift phase controlled by thermal …
Fine-Scale Structure Of The San Andreas Fault Zone And Location Of The Safod Target Earthquakes, C. Thurber, S. Roecker, H. Zhang, S. Baher, W. Ellsworth
Fine-Scale Structure Of The San Andreas Fault Zone And Location Of The Safod Target Earthquakes, C. Thurber, S. Roecker, H. Zhang, S. Baher, W. Ellsworth
United States Geological Survey: Staff Publications
We present results from the tomographic analysis of seismic data from the Parkfield area using three different inversion codes. The models provide a consistent view of the complex velocity structure in the vicinity of the San Andreas, including a sharp velocity contrast across the fault. We use the inversion results to assess our confidence in the absolute location accuracy of a potential target earthquake. We derive two types of accuracy estimates, one based on a consideration of the location differences from the three inversion methods, and the other based on the absolute location accuracy of ‘‘virtual earthquakes.’’ Location differences are …