Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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Seismic hazard classifications and Vs30 in Connecticut using MASW and HVSR methods Seismic hazard classifications and Vs30 in Connecticut using MASW and HVSR methods
Five new seismic hazard classifications for Hartford County, Connecticut (CT), were proposed by New England State Geologists (NESG) in an effort to improve the current USGS Seismic Hazard Map. These classes were derived from mapped surficial materials, but in situ information is required to verify this approach. Therefore, active and passive surface wave techniques were performed at...
Authors
Sarah L C Morton, John W. Lane, Margaret A. Thomas, Lanbo Liu
Probabilistic models of seafloor composition using multispectral acoustic backscatter: The benthic detectorists Probabilistic models of seafloor composition using multispectral acoustic backscatter: The benthic detectorists
We describe and compare two probabilistic models for task-specific seafloor characterization based on multispectral backscatter. We examine whether generative or discriminative approaches to supervised seafloor characterization do better at harnessing the greatly increased information about seafloor substrate composition that is encoded in the backscattering response across multiple...
Authors
Daniel D. Buscombe, Paul E. Grams, Matthew Kaplinski
Characterizing the Los Angeles Aqueduct crossing of the San Andreas Fault for improved earthquake resilience Characterizing the Los Angeles Aqueduct crossing of the San Andreas Fault for improved earthquake resilience
The five-mile-long Elizabeth Tunnel, which crosses the San Andreas fault (SAF) zone near Lake Hughes, California, is part of the Los Angeles Aqueduct (LAA) that delivers water from Owens Valley to the City of Los Angeles. Geologic characterization of the Elizabeth Tunnel alignment is focused on developing a better understanding of fault displacement hazards at the SAF crossing to support...
Authors
Scott Lindvall, Scott Kerwin, Chris Heron, Craig A. Davis, Jeff Tyson, Jim Chestnut, Kevin Mass, Mike Farr, Katherine M. Scharer, Devin McPhillips
The science, engineering applications, and policy implications of simulation-based PSHA The science, engineering applications, and policy implications of simulation-based PSHA
We summarize scientific methods for developing probabilistic seismic hazard assessments from 3-D earthquake ground motion simulations, describe current use of simulated ground motions for engineering applications, and discuss on-going efforts to incorporate these effects in the U.S. national seismic hazard model. The 3-D simulations provide important, additional information about...
Authors
Morgan P. Moschetti, Sandra P. Chang, C.B Crouse, Arthur D. Frankel, Robert Graves, H Puangnak, Nico Luco, Christine A. Goulet, Sanaz Rezaeian, Allison Shumway, Peter M. Powers, Mark D. Petersen, Scott Callaghan, T.H. Jordan, Kevin R. Milner
Application of electromagnetic induction to develop a precision irrigation framework to facilitate smallholder dry season farming in the Nasia-Kparigu area of northern Ghana Application of electromagnetic induction to develop a precision irrigation framework to facilitate smallholder dry season farming in the Nasia-Kparigu area of northern Ghana
No abstract available.
Authors
Jeremy M Fontaine, Alexander Percy, Erasmus K Oware, Patience Bosompemaa, Vincent Gbedzi, John W. Lane
A novel technique for precision geometric correction of jitter distortion for the Europa Imaging System and other rolling shutter cameras A novel technique for precision geometric correction of jitter distortion for the Europa Imaging System and other rolling shutter cameras
We use simulated images to demonstrate a novel technique for mitigating geometric distortions caused by platform motion (“jitter”) as two-dimensional image sensors are exposed and read out line by line (“rolling shutter”). The results indicate that the Europa Imaging System (EIS) on NASA’s Europa Clipper can likely meet its scientific goals requiring 0.1-pixel precision. We are therefore...
Authors
Randolph L. Kirk, Makayla Shepherd, Stuart Sides