Article
Geochemistry & Geophysics
Erik K. Fredrickson, Joan S. Gomberg, William S. D. Wilcock, Susan L. Hautala, Albert J. Hermann, H. Paul Johnson
Summary: In subduction zones, seafloor pressure data are used to monitor tectonic deformation, but they are also influenced by oceanographic circulation-generated pressures. This study evaluates correction methods for these pressures and tests their impact on predicting slow slip events. The results show that subtracting the first mode of the pressure records and using depth-dependent spatial coherence proxies significantly reduce errors and improve detectability. However, abrupt pressure changes during seasonal transitions and instrumental drift remain challenges for accurate detection.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Gail L. Christeson, Sean P. S. Gulick, Maureen A. L. Walton, Ginger A. Barth
Summary: This study investigates the crustal structure of the Gulf of Alaska Seamount Province and reveals that variations in crustal thickness and lithospheric thickness play a significant role in the magmatic underplating at seamounts and seamount provinces.
Article
Environmental Sciences
Kelly K. Hastings, Thomas S. Gelatt, John M. Maniscalco, Lauri A. Jemison, Rod Towell, Grey W. Pendleton, Devin S. Johnson
Summary: The North Pacific marine heatwave from 2014 to 2016 had widespread and persistent impacts on the Gulf of Alaska and California Current ecosystems, leading to reduced survival rates of Steller sea lions. The survival of adult females in the eastern areas was significantly lower during the heatwave, while the survival of Kodiak and Sugarloaf females was also affected. The response of Steller sea lions to the heatwave varied regionally.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Julie Heggdal Velle, Maureen H. Walczak, Brendan Reilly, Guillaume St-Onge, Joseph S. Stoner, Stewart Fallon, Alan C. Mix, Christina Belanger, Matthias Forwick
Summary: The study investigated high-resolution paleomagnetic records of sediments from the south Alaska continental slope, suggesting that Site U1419 provides the ability to study paleomagnetic secular variation. Due to various factors, sediments at this site are not suitable for paleointensity studies, but the inclination record is deemed reliable to some extent and offers insights into regional geomagnetic variations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Engineering, Marine
Mohammad Heidarzadeh, Iyan E. Mulia
Summary: The July 2020 tsunami in Alaska exhibited very long period waves (51-64 min) and a small coastal amplitude (-0.5 m), likely attributed to the deep focal depth of the earthquake and the extremely shallow water around the source region.
Article
Fisheries
Lauri L. Sadorus, Esther D. Goldstein, Raymond A. Webster, William T. Stockhausen, Josep V. Planas, Janet T. Duffy-Anderson
Summary: This study utilized individual-based biophysical modeling and spatial modeling to reveal larval dispersal and young fish migration pathways of Pacific halibut between the Gulf of Alaska and the eastern Bering Sea. The results showed that the Aleutian Islands act as barriers but larger island passes facilitate connectivity between these ecosystems, with spawning location influencing the degree of connectivity. The patterns of larval dispersal and post-settlement migrations suggest circular, multi-life stage connectivity between these ecosystems regardless of climatic variability.
FISHERIES OCEANOGRAPHY
(2021)
Article
Geochemistry & Geophysics
Song Xu, Zhihui Zou, Xiaoming Tang
Summary: The LWD acoustic technology is used to measure formation velocities/slownesses, and the MDP method accurately determines wave slowness from the LWD acoustic data. The corrected results can be applied to synthetic seismograms and porosity prediction analyses.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Lorena M. Rios-Mendoza, Jorge Feliciano Ontiveros-Cuadras, Daniela Leon-Vargas, Ana Carolina Ruiz-Fernandez, Martin Rangel-Garcia, Libia Hascibe Perez-Bernal, Joan-Albert Sanchez-Cabeza
Summary: Microplastics (MPs) were studied in beach sands, surface waters, and suspended sediments in Mazatl'an, Mexico. The study found that MP contamination is influenced by rainfall and population density, with the most abundant shapes being white/clear fragments and fibers. The highest MP fluxes were observed in suspended sediments during the rainfall season.
MARINE POLLUTION BULLETIN
(2021)
Article
Geochemistry & Geophysics
Yuhji Yamamoto, Hiroto Fukami, Peter C. Lippert
Summary: This study provides new insights into relative paleointensity (RPI) variations by conducting rock magnetic and paleomagnetic measurements on Eocene marine sediments. The results show that RPI fluctuates within each chron and is influenced by inhomogeneous rock magnetic properties. The study also establishes a stacked RPI curve for Chron 18 and compares it with records from the equatorial Pacific, revealing similar characteristics.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Oceanography
Szymon Surma, Evgeny A. Pakhomov, Tony J. Pitcher
Summary: This study examines the importance of Pacific herring as a key forage fish in the southeastern Gulf of Alaska using ecosystem models. The results indicate that the energy content of herring plays a critical role in determining its importance in the food chain. The depletion of herring has negative impacts on predators but positive impacts on zooplankton.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Fisheries
Sarah C. Stienessen, Christopher N. Rooper, Thomas C. Webe, Darin T. Jones, Jodi L. Pirtle, Christopher D. Wilson
Summary: This study used multibeam sonar data and video analysis to verify the effectiveness of seafloor characteristics in predicting habitat trawlability through various models. The results showed that Sb oblique is the most important feature in discriminating between trawlable and untrawlable habitat, which can help improve habitat-specific estimates of biomass of marine fish species.
Article
Environmental Sciences
John F. Piatt, David C. Douglas, Mayumi L. Arimitsu, Michelle L. Kissling, Erica N. Madison, Sarah K. Schoen, Kathy J. Kuletz, Gary S. Drew
Summary: Kittlitz's Murrelets nest in glaciated or recently deglaciated landscapes during summer and forage in adjacent marine waters. Their post-breeding migration patterns indicate a movement towards the Bering Sea and Arctic Ocean, with stopovers along the way. Ship-based surveys confirm their migration into the Arctic Ocean in autumn and their wintering in the Bering Sea before returning to breeding grounds.
Article
Geosciences, Multidisciplinary
Ahmed E. Radwan
Summary: This study modeled the vertical distribution of pore and fracture pressures in the El Morgan oil Field in the Gulf of Suez region using a combination of data and industry-standard methods. Important parameters such as lithostatic gradient and fracture pressure were analyzed, providing valuable design references for petroleum development.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geology
Evi Wubben, Tjerk Veenstra, Jakub Witkowski, Isabella Raffi, Frederik Hilgen, Remco Bos, Joost van Dijk, Ymke Lathouwers, Bianca Spiering, Laurens Vennema, Zongyi Wang, Francesca Sangiorgi, Appy Sluijs
Summary: This study provides a high-resolution record of the tropical paleoclimate during the Miocene Climatic Optimum (MCO) in the eastern equatorial Atlantic Ocean. By analyzing sediment samples from Ocean Drilling Program (ODP) Site 959, the researchers established an orbitally resolved age model and identified key events such as the onset of the MCO and changes in productivity.
NEWSLETTERS ON STRATIGRAPHY
(2023)
Article
Marine & Freshwater Biology
V. I. Radchenko, A. N. Kanzeparova, A. A. Somov, I. V. Grigorov
Summary: The distribution and abundance of four common myctophid fish species in the upper epipelagic layer of the northeastern North Pacific in winter were analyzed based on research surveys in the Gulf of Alaska in 2019 and 2020. The myctophid community in this layer is dominated by the blue lanternfish. Juvenile northern lampfish accounted for the highest percentage in winter catches, likely transported by the Subarctic Current to the Bering Sea. The study also discusses the daily vertical migrations of common myctophid species, confirming their functional role in marine communities.
RUSSIAN JOURNAL OF MARINE BIOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Catherine H. Ross, Daniel F. Stockli, Cornelia Rasmussen, Sean P. S. Gulick, Sietze J. de Graaff, Philippe Claeys, Jiawei Zhao, Long Xiao, Annemarie E. Pickersgill, Martin Schmieder, David A. Kring, Axel Wittmann, Joanna Morgan
Summary: Determining the nature and age of the Chicxulub impact target rock is crucial for understanding the evolution of the Maya Block basement. The data from Expedition 364 shed light on the pre-impact tectonic evolution of the Chicxulub target rocks, suggesting the existence of a continental volcanic arc in the Maya Block.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Sietze J. de Graaff, Pim Kaskes, Thomas Dehais, Steven Goderis, Vinciane Debaille, Catherine H. Ross, Sean P. S. Gulick, Jean-Guillaume Feignon, Ludovic Ferriere, Christian Koeberl, Jan Smit, Nadine Mattielli, Philippe Claeys
Summary: This study characterizes the petrography and geochemistry of rocks and impactites from the Chicxulub impact structure in Mexico, aiming to investigate the components involved in impact melt formation and the emplacement processes at Chicxulub. The different impactite units are interpreted as different stages of impact melt rock injection and surface deposition during crater formation. The geochemical characterization of pre-impact lithologies provides insights into the composition of the impact melt rock units.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Pim Kaskes, Sietze J. de Graaff, Jean-Guillaume Feignon, Thomas Dehais, Steven Goderis, Ludovic Ferriere, Christian Koeberl, Jan Smit, Axel Wittmann, Sean P. S. Gulick, Vinciane Debaille, Nadine Mattielli, Philippe Claeys
Summary: This study presents a new classification of a similar to 100-m-thick crater suevite sequence, providing valuable insights into the formation and sedimentary processes of suevite on top of the Chicxulub peak ring. The data set obtained from this study sheds light on the dynamics and timing of proximal marine cratering processes following a large impact event.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
L. Hernandez-Terrones, L. Martinez, J. Szamotulski, E. Gonzalez-Partida, J. V. Morgan, C. M. Lowery, S. P. S. Gulick, M. Rebolledo-Vieyra, D. Kring
Summary: The aim of this study is to evaluate fluid circulation and determine the composition of hydrothermal fluids in the Chicxulub crater after the impact. The results show that the temperature and composition of the fluids changed as they migrated through the crater rocks, and post-impact fluid circulation modified the temperature distribution.
APPLIED GEOCHEMISTRY
(2022)
Article
Geochemistry & Geophysics
C. G. Nixon, D. R. Schmitt, R. Kofman, J. Lofi, S. P. S. Gulick, S. Saustrup, G. L. Christeson, D. A. Kring
Summary: This study conducted a vertical seismic profile in a borehole to better understand the seismic reflectivity and in situ seismic properties of the Chicxulub impact structure peak ring. The results showed that the strong seismic reflection event observed in the seismic reflection data was caused by discontinuities in the elastic impedance. The seismic wavefield below the reflection event was chaotic, indicating high levels of scattering. Shear wave speeds and damage parameters were also determined, which can aid in calibrating impact models and assessing levels of fracturing.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Dan Bassett, Adrien Arnulf, Stuart Henrys, Dan Barker, Harm Avendonk, Nathan Bangs, Shuichi Kodaira, Hannu Seebeck, Laura Wallace, Andrew Gase, Thomas Luckie, Katie Jacobs, Brook Tozer, Ryuta Arai, David Okaya, Kimi Mochizuki, Gou Fujie, Yojiro Yamamoto
Summary: Marine multichannel and wide-angle seismic data were used to study the crustal structure along a 530 km margin-parallel transect of the Hikurangi subduction zone. The research found that the subducting Hikurangi Plateau crust is about 1 km thicker and has slightly higher mantle velocities beneath the south/central Hikurangi compared to the north Hikurangi. In the overthrusting plate, there is a significant reduction in forearc wavespeeds from south to north, accompanied by a change in seismic reflection character. The study suggests that the geological architecture of the overthrusting plate contributes to spatial variability in the location of shallow frictional transitions along the Hikurangi margin, impacting seismic and tsunami hazard.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Brandon Shuck, Sean P. S. Gulick, Harm J. A. Van Avendonk, Michael Gurnis, Rupert Sutherland, Joann Stock, Erin Hightower
Summary: This study reveals the spatial-temporal evolution of stress during subduction initiation and suggests an accelerated transition to self-sustaining subduction. In contrast to previous hypotheses, the study proposes a four-dimensional evolution where horizontal forces initially dominate but vertical forces accelerate over time and facilitate the development of self-sustaining subduction.
Article
Geosciences, Multidisciplinary
Maureen A. L. Walton, Sean P. S. Gulick, Peter J. Haeussler
Summary: This study presents an improved tectonic framework for the Yakutat area in southeastern Alaska, based on marine geophysical data collected in 2012. By combining various data sources, the researchers were able to update the fault map, develop a structural model of Yakutat Bay, and assess the uncertainties of previous geologic coseismic uplift measurements. The results provide valuable insights into earthquake hazards in the region.
Article
Chemistry, Physical
Xiongyu Chen, Chang Da, Daniel C. Hatchell, Hugh Daigle, John-Richard Ordonez-Varela, Christophe Blondeau, Keith P. Johnston
Summary: The surface of silica nanoparticles (NP) was modified with two amino ligands to achieve colloidal stability and interfacial activity. The modified NP, when combined with a like-charged diamine surfactant, resulted in ultra-stable CO2 foam at low NP concentrations.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Geology
Cole M. Speed, John M. Swartz, Sean P. S. Gulick, John A. Goff
Summary: This study reveals the preservation and stratigraphic expression of coastal geomorphic features through the analysis of seismic reflection data. It also proposes recognition criteria for the seismic stratigraphic expression of coastal floodplain channels.
Article
Geochemistry & Geophysics
Sietze J. de Graaff, Catherine H. Ross, Jean-Guillaume Feignon, Pim Kaskes, Sean P. S. Gulick, Steven Goderis, Thomas Dehais, Vinciane Debaille, Ludovic Ferriere, Christian Koeberl, Nadine Mattielli, Daniel F. Stockli, Philippe Claeys
Summary: The study presents the first ages of pre-impact magmatic dikes preserved in Chicxulub's peak ring, providing insights into the subsurface composition and evolutionary history of the Yucatan Peninsula. The dating results reveal two age groups, Carboniferous dacites (328-318 Ma) and Jurassic dolerites (169-159 Ma), suggesting the presence of previously unsampled magmatic phases. The investigation of isotopic compositions further indicates that the dolerites contributed significantly to the Chicxulub impact melt rock, representing a pervasive Jurassic magmatic phase associated with the opening of the Gulf of Mexico.
Article
Geosciences, Multidisciplinary
Jacob T. Burstein, John A. Goff, Sean P. S. Gulick, Christopher Lowery, Patricia Standring, John Swartz
Summary: Understanding the role of antecedent topography in the evolution of barrier islands is valuable for preparing coastal communities for future impacts of climate change. This study investigates the stratigraphic framework of the Trinity River incised valley offshore Galveston, Texas to examine the influence of antecedent topography on the evolution of an early Holocene barrier island system. The findings highlight the central role of the geometry and elevation of the underlying antecedent topography in promoting both initiation and stabilization of the barrier island system.
Article
Geochemistry & Geophysics
David Fukuyama, Hugh C. Daigle, Michael A. Nole, Wen Song
Summary: Short-range diffusion and long-range advection are the main mechanisms for transporting methane. This study introduces a new mechanism, density-driven convection, which is driven by hydrate formation and salt exclusion in the pore water. The study demonstrates the rapid transport of aqueous methane throughout the sand layer with convection compared with diffusion.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Christina M. Verhagen, Ji-In Jung, Sonia M. Tikoo, Axel Wittmann, David A. Kring, Stefanie Brachfeld, Laying Wu, Dale H. Burns, Sean P. S. Gulick
Summary: Using advanced microscopy techniques, this study investigated the nature and occurrence of primary and secondary Fe-oxide and Fe-sulfide minerals in the suevite of the Chicxulub impact crater. The results showed decomposition and dissolution patterns of large primary Fe-oxides and the presence of sub-micrometer Fe-oxide crystals concentrated within clay. Secondary Fe-sulfide minerals, associated with Ni- and Co-rich phases, were also found. These findings provide insights into hydrothermal trends and the remobilization of Fe and associated elements in suevites.
Meeting Abstract
Geochemistry & Geophysics
S. P. S. Gulick, N. McCall, C. Ross, D. Stockli, C. Rasmussen, G. L. Christeson, M. Hesse, M. Malenda, E. L. Lopes, T. M. Chaffee, S. M. Tikoo-Schantz, T. Vanorio, J. V. Morgan
METEORITICS & PLANETARY SCIENCE
(2022)