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.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Incorporating uncertainty in susceptibility criteria into probabilistic liquefaction hazard analysis
Most conventional approaches for assessing liquefaction triggering hazards generally rely on simplified procedures that involve identifying liquefaction susceptible layers and calculating a factor of safety against liquefaction (FSL) in each layer. Such procedures utilize deterministic semi-empirical models for standard penetration test (SPT), cone penetrometer test (CPT), or shear wave velocity (
Authors
Andrew James Makdisi
Exploring the geology of the Midcontinent Rift under western Lake Superior using a preliminary velocity model of seismic line GLIMPCE C
Seismic-reflection data were collected in the 1980s as part of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) to investigate the 1.1 Ga Midcontinent Rift System (MRS). GLIMPCE Line C crosses western Lake Superior from north to south shores (Fig. 1 inset). Many previous workers have interpreted the MRS in Line C as an asymmetric central graben filled with 10–
Authors
V. J. S. Grauch, Samuel J. Heller, Esther K. Stewart, Laurel G. Woodruff
Subsurface characterization of the Duluth Complex and related intrusions from 3D modeling of gravity and magnetotelluric data
No abstract available.
Authors
Dana E. Peterson, Paul A. Bedrosian, Carol A. Finn
Asteroid impacts and cascading hazards
The initial effects from an asteroid impact are generally well characterized and include thermal radiation and blast waves. If the impactor is sufficiently large, either an earthquake or tsunami can also result, depending on whether the impact occurs over land or water. However, the longer-term effects that extend beyond the area initially affected are less well characterized. Because regional ef
Authors
Timothy N. Titus, D. G. Robertson, Joel B. Sankey, Larry G. Mastin
Successful hindcast of 7 years of mud morphodynamics influenced by salt pond restoration in south San Francisco Bay
Alviso Slough in South San Francisco Bay has been experiencing restoration of adjacent former salt-production ponds into muted tidal ponds, tidal ponds, and salt marsh. As a result, tidal prism through Alviso Slough has increased and mercury-contaminated sediment has been remobilized. We developed a 2D, high-resolution, process-based model (Delft3D FM-wave) to hindcast observed morpho-dynamic deve
Authors
Mick Van der Wegen, Johan Reyns, Bruce E. Jaffe, Amy C. Foxgrover, Fernanda Achete, Mark C. Marvin-DiPasquale, Theresa A. Fregoso, Judy Nam, Jessica Lovering
Contributions to uncertainty in runup forecasts
The U.S. Geological Survey (USGS) provides operational forecasts of total water levels (TWL) and coastal change. Uncertainties around forecast TWL are based on the temporal and spatial range of observed beach slopes near the forecast site. This paper investigates other sources of uncertainty that are not accounted for, focusing on four beaches where the USGS has deployed remote cameras, and on out
Authors
Christopher R. Sherwood, Alfredo Aretxabaleta, Peter A. Traykovski, Jin-Si R. Over, Erin Lyons, David S. Foster, Jennifer L. Miselis, Timothy Nelson, Erdinc Sogut
Karst terrain promotes thermal resiliency in headwater streams
The response of stream ecosystems to climate change will depend in part on groundwater processes that reduce the sensitivity of streams to atmospheric conditions. We investigated the thermal sensitivity of streams across a gradient of groundwater inputs defined by karst terrain (carbonate parent materials) in the headwaters of the Potomac River basin in eastern North America. We collected stream
Authors
Karmann G. Kessler, Karli M Rogers, Charles Marshak, Nathaniel P. Hitt
Waterfalls in reservoirs: Tracking the development of nickpoints in the sediments of declining reservoirs
Recent drought has resulted in dramatic lowering of the two largest water-storage reservoirs in the western United States: Lake Powell and Lake Mead. These decreases in reservoir elevations have resulted in the re-emergence of over 100 km of the Colorado and San Juan rivers at the upstream end of Lake Powell and over 80 km of the Colorado River at the upstream end of Lake Mead. Upon reservoir lowe
Authors
Paul Grams, Robert B. Tusso
Evaluating methods for applying fouling attenuation shifts to acoustic backscatter data used in suspended-sediment computations
No abstract available.
Authors
Zulimar Lucena, Michael T. Lee, Jeffery W. East
The evolution of natural and developed barriers under accelerating sea levels
Communities residing on barrier islands depend upon the ability of barriers to withstand forcings such as waves, sea-level rise, and storms, particularly under stresses from climate change. Using a barrier island evolution model, we compare barrier response to linear versus accelerating sea-level rise. Results suggest that barriers are more likely to drown under accelerating rather than linear sea
Authors
Rose Elizabeth Palermo, Andrew D. Ashton, Di Jin, Porter Hoagland, Jorge Lorenzo-Trueba
Exploring centennial barrier-inlet evolution: Insights from undeveloped and developed phases at Barnegat Inlet, New Jersey
This study aims to identify the natural processes and the subsequent responses to coastal engineering and development on the alongshore evolution of the IB-BI-LBI inlet-barrier system. The primary focus will be the quantification of barrier island and inlet sediment partitioning at decadal to centennial timescales, from 1839-1941. We analyze historical alongshore evolution and track coastal engine
Authors
Shane Nichols-O'Neill, Jorge Lorenzo-Trueba, Daniel J. Ciarletta, Jennifer L. Miselis
Stream corridor sources of suspended sediment and sediment-bound phosphorus from an urban tributary to the Great Lakes
Potential sources of suspended sediment and sediment-bound phosphorus (sedP) were studied in the Kinnickinnic River (51 square kilometers), a heavily urbanized tributary to Lake Michigan (90% urban land use) in Milwaukee, Wisconsin. The river is 60% concrete lined channels, with few unlined reaches. From September 2019 through August 2020, an integrated study of sediment budget and sediment finger
Authors
James Blount, Leah Lenoch, Faith Fitzpatrick