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Filter Total Items: 1407
Bathymetric and acoustic-backscatter mapping of Lake Sammamish, Washington, during USGS field activity 2021-656-FA Bathymetric and acoustic-backscatter mapping of Lake Sammamish, Washington, during USGS field activity 2021-656-FA
In 2021, scientists from the U.S. Geological Survey (USGS) acquired bathymetric and acoustic-backscatter data within Lake Sammamish, Washington. Mapping was completed to find evidence of past earthquakes such as underwater landslides and is part of a larger USGS project to understand the overall geologic hazards history of the Cascadia Margin region. The survey was conducted using the...
Authors
Peter Dartnell, Daniel S. Brothers, Brian Sherrod, Gerry Hatcher, Daniel Powers, Jenna Hill, Jackson Currie, Peter Dal Ferro
Mineralization processes at Escanaba Trough Mineralization processes at Escanaba Trough
Escanaba Trough off northern California is the southernmost and only sediment covered segment of the Gorda Ridge. Hydrothermal mineralization was first discovered in Escanaba Trough in 1985, and subsequent investigations included the delineation of the NESCA (northern Escanaba) and SESCA (southern Escanaba) sections of Escanaba Trough, as well as drilling by Ocean Drilling Program (ODP)...
Authors
Amy Gartman, Jaycee Janet Favela, Katlin Bowman Adamczyk, John Jamieson, Rob Zierenberg, Isobel Yeo
Complex sound scattering layer and water-column dynamics over a mesophotic coral ecosystem: Southwest Puerto Rico, U.S.A. Complex sound scattering layer and water-column dynamics over a mesophotic coral ecosystem: Southwest Puerto Rico, U.S.A.
A nearly 5-month record of high-resolution temperature and acoustic backscatter profiles from the upper insular slope off southwest Puerto Rico reveals complex sound scattering layer (SSL) dynamics over a mesophotic coral ecosystem (MCE). The SSLs exhibited both diel and reverse diel vertical migration, thin layer (
Authors
Olivia Cheriton, Curt Storlazzi, Clark Sherman, Kurt Rosenberger, Nikolaos Schizas
An exploration of the relative influence of physical models for Omori’s law An exploration of the relative influence of physical models for Omori’s law
Omori’s law states that the rate of aftershocks decays as a function of inverse time. There are multiple physical explanations that we reduce into a nonlinear mixed effects relation of three terms: (1) a Rate/State expression that can account for static/dynamic and viscoelastic triggering caused directly by the mainshock, (2) a fluid diffusion triggering term, and (3) a randomized...
Authors
Thomas Parsons, Eric Geist, L. Malagnini
Extremophile hotspots linked to containerized industrial waste dumping in a deep-sea basin Extremophile hotspots linked to containerized industrial waste dumping in a deep-sea basin
Decaying barrels on the seafloor linked to DDT contamination have raised concerns about the public health implications of decades old industrial waste dumped off the coast of Los Angeles. To explore their contents, we collected sediment cores perpendicular to five deep-sea barrels. The concentration of DDT and its breakdown products were highly elevated relative to control sites yet did...
Authors
Johanna Gutleben, Sheila Podell, Kira Mizell, Douglas Sweeney, Carlos Neira, Lisa Levin, Paul Jensen
Analysis of a human-mediated microbioinvasion: The global spread of the benthic foraminifer Trochammina hadai Uchio, 1962 Analysis of a human-mediated microbioinvasion: The global spread of the benthic foraminifer Trochammina hadai Uchio, 1962
A non-indigenous species (NIS) of benthic foraminifera was first identified in a core collected in 1993 in San Francisco Bay, California, USA, and subsequently identified as Trochammina hadai Uchio, 1962. Archived samples and literature reviews were used to determine that the species, which is native to Asia, arrived in San Francisco Bay between the early 1960s and 1983. Through...
Authors
Mary McGann, Maria Holzmann, Vincent Bouchet, Sibelle Disaró, Patricia Eichler, David Haig, Stephen Himson, Hiroshi Kitazato, Jean-Charles Pavard, Irina Polovodova Asteman, Andre Rodrigues, Clement Tremblin, Masashi Tsuchiya, Mark Williams, Phoebe O'Brien, Josefin Asplund, Malou Axelsson, Thomas Lorenson
Mitigating flood risks in urban estuaries: Tidal dynamics, shoreline hardening, nature-based solutions, and floodgates in San Francisco Bay Mitigating flood risks in urban estuaries: Tidal dynamics, shoreline hardening, nature-based solutions, and floodgates in San Francisco Bay
Hydrodynamic models are valuable tools for understanding the primary factors influencing daily and peak water levels and for guiding discussions on potential adaptation strategies for managing flood risk in coastal areas. This analysis uses the Delft3D San Francisco Bay-Delta Community Model to simulate water levels and incorporates the effects of a number of adaptation measures in the...
Authors
Kees Nederhoff, Rohin Saleh, Patrick L. Barnard, Mark Stacey
Comparison of creek and bay influences on salt marsh sediment budget and deposition patterns Comparison of creek and bay influences on salt marsh sediment budget and deposition patterns
The resilience of salt marshes with low organic production depends on their effective capture and retention of mineral sediment from adjacent waters. Little prior work has directly compared mechanisms of sediment import from wave-influenced marsh boundaries against those of tidal creeks. We used simultaneous deployment of net-deposition tiles and oceanographic sensors to identify the...
Authors
Lukas WinklerPrins, Jessica Lacy, Mark Stacey, Karen M. Thorne, McKenna Bristow, Scott Jones
Land-based nutrient flux to a fringing reef: Insights from Ofu Island, American Samoa Land-based nutrient flux to a fringing reef: Insights from Ofu Island, American Samoa
Submarine groundwater discharge (SGD) is a critical driver of nutrient transport in coral reef ecosystems, shaping water quality, primary productivity, and overall reef health. This study quantifies SGD fluxes and associated nutrient dynamics in two reef flat pools within the Ofu Unit of the National Park of American Samoa: Papaloloa and Fatuana. A multi-method approach integrating...
Authors
Nancy Prouty, Ferdinand Oberle, Olivia Cheriton, Lauren Toth, Eric K. Brown, Curt Storlazzi
Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s Contributions of erosion, deposition, and human activities to a change in sand storage in the bed of San Francisco Bay, California, 1980s to 2010s
This study by the U.S. Geological Survey (USGS) provides estimates of the change in sand storage in bed sediments from the 1980s to 2010s in the San Francisco Bay area, California. The study is part of a larger project called “Research to Understand Impacts of Bay Sand Mining on Sand Transport in San Francisco Bay and the Outer Coast” that has the goal of providing information for the...
Authors
Theresa Fregoso, Bruce Jaffe, Amy Foxgrover, Donald Woodrow, Bethany Kharrazi, Kevin Orzech
Benchmarking shoreline prediction models over multi-decadal timescales Benchmarking shoreline prediction models over multi-decadal timescales
Robust predictions of shoreline change are critical for sustainable coastal management. Despite advancements in shoreline models, objective benchmarking remains limited. Here we present results from ShoreShop2.0, an international collaborative benchmarking workshop, where 34 groups submitted shoreline change predictions in a blind competition. Subsets of shoreline observations at an...
Authors
Yongjing Mao, Giovanni Coco, Sean Vitousek, Jose Antolinez, Georgios Azorakos, Masayuki Banno, Clément Bouvier, Karin R. Bryan, Laura Cagigal, Kit Calcraft, Bruno Castelle, Xinyu Chen, Maurizio D'Anna, Lucas de Freitas Pereira, Iñaki de Santiago, Aditya N. Deshmukh, Bixuan Dong, Ahmed Elghandour, Amirmahdi Gohari, Eduardo Gomez-de la Peña, Mitchell Harley, Michael Ibrahim, Déborah Idier, Camilo Jaramillo Cardona, Changbin Lim, Ivana Mingo, Julian O'Grady, Daniel Pais, Oxana Repina, Arthur Robinet, Dano Roelvink, Joshua Simmons, Erdinc Sogut, Katie Wilson, Kristen Splinter
Seasonal rotation of California pocket beaches Seasonal rotation of California pocket beaches
Pocket beaches are short, headland-bound coastal landforms that may exhibit shoreline rotation in response to time-varying wave conditions. Here we examine the presence, location and style of pocket beach rotation along the 1700 km coast of California using a comprehensive 22-year satellite-derived shoreline dataset. These analyses identify 23 pocket beaches that exhibit annual cycles of...
Authors
Jonathan Warrick, Daniel Buscombe, Kilian Vos, Andrew C. Ritchie, Bob Battalio