Publications
Filter Total Items: 7239
Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California
The purpose of this work is to identify genetic affinities among 48 crude oil samples from the onshore and offshore Santa Maria basins. A total of 21 source-related biomarker and stable carbon isotope ratios among the samples were assessed to assure that they were unaffected by secondary processes. Chemometric analysis of these data identifies six oil families with map and stratigraphic distributi
Authors
Kenneth E. Peters, Paul G. Lillis, Thomas Lorenson, J. E. Zumberge
Planetary geologic mapping—Program status and future needs
The United States Geological Survey’s (USGS) Planetary Geologic Map Coordination Group (Flagstaff, Ariz.) surveyed planetary geoscience map makers and users to determine the importance, relevance, and usability of such products to their planetary science research and to current and future needs of the planetary science community. This survey was prepared because the planetary science community lac
Authors
James A. Skinner, Alexandra E. Huff, Corey M. Fortezzo, Tenielle Gaither, Trent M. Hare, Marc A. Hunter, Holly Buban
Combining dynamic rupture simulations with ground motion data to characterize seismic hazard from Mw 3-5.8 earthquakes in Oklahoma and Kansas
Many seismically active areas suffer from a lack of near‐source ground‐motion recordings, making ground‐motion prediction difficult at distances within ∼40 km∼40 km from an earthquake. We aim to aid the development of near‐source ground‐motion prediction equations (GMPEs) by generating synthetic ground‐motion data via simulation. Building on previous work using point‐source moment tensor sources
Authors
Samuel Bydlon, Kyle Withers, Eric M. Dunham
Shallow geology, sea-floor texture, and physiographic zones of the inner continental shelf from Aquinnah to Wasque Point, Martha’s Vineyard, and Eel Point to Great Point, Nantucket, Massachusetts
A series of interpretive maps that describe the shallow geology, distribution, and texture of sea-floor sediments, and physiographic zones of the sea floor along the south and west shores of Martha’s Vineyard and the north shore of Nantucket, Massachusetts, were produced by using high-resolution geophysical data (interferometric and multibeam swath bathymetry, light detection and ranging (lidar) b
Authors
Elizabeth A. Pendleton, Wayne E. Baldwin, Seth D. Ackerman, David S. Foster, Brian D. Andrews, William C. Schwab, Laura L. Brothers
Morphodynamics of a field of crescent-shaped rippled scour depressions: Northern Monterey Bay, CA
Despite the prevalence of rippled scour depression (RSD) on the world's continental shelves and their importance as nursery habitats for many commercially-important species, the processes responsible for their formation and geomorphic evolution are still not well understood. Most studies that focused on RSD evolution have been based on data acquired over multiple years to decades, and often during
Authors
Kurt J. Rosenberger, Curt D. Storlazzi, Peter Dartnell
Slough evolution and legacy mercury remobilization induced by wetland restoration in South San Francisco Bay
Coastal wetlands have a long history of degradation and destruction due to human development. Now recognized as one of the most productive ecosystems in the world, substantial efforts are being made to restore this critical habitat. While wetland restoration efforts are generally viewed as beneficial in terms of providing wildlife habitat and flood control, they are often accompanied by dramatic p
Authors
Amy C. Foxgrover, Mark C. Marvin-DiPasquale, Bruce E. Jaffe, Theresa A. Fregoso
The limits of earthquake early warning accuracy and best alerting strategy
We explore how accurate earthquake early warning (EEW) can be, given our limited ability to forecast expected shaking even if the earthquake source is known. Because of the strong variability of ground motion metrics, such as peak ground acceleration (PGA) and peak ground velocity (PGV), we find that correct alerts (i.e., alerts that accurately predict the observed ground motion above a predeterm
Authors
Sarah E. Minson, Annemarie S. Baltay, Elizabeth S. Cochran, Thomas C. Hanks, Morgan T. Page, Sara McBride, Kevin R. Milner, Men-Andrin Meier
Rupture model of the M5.8 Pawnee, Oklahoma earthquake from regional and teleseismic waveforms
The 2016 M5.8 Pawnee, Oklahoma earthquake is the largest earthquake to have been induced by wastewater disposal. We infer the coseismic slip history from analysis of apparent source time functions and inversion of regional and teleseismic P‐waveforms, using aftershocks as empirical Green's functions. The earthquake nucleated on the shallow part of the fault, initially rupturing towards the surface
Authors
Morgan P. Moschetti, Stephen H. Hartzell, R. B. Herrmann
Organic geochemical investigation of far‐field tsunami deposits of the Kahana Valley, O'ahu, Hawai'i
Far‐field tsunami deposits observed in the Kahana Valley, O'ahu, Hawai'i (USA), were investigated for their organic‐geochemical content. During short high‐energy events, (tsunamis and storms) organic and chemical components are transported with sediment from marine to terrestrial areas. This study investigates the use of anthropogenic based organic geochemical compounds (such as polycyclic aromati
Authors
Piero Bellanova, Mike Frenken, Bruce M. Richmond, Jan Schwarzbauer, SeanPaul La Selle, Frances Griswold, Bruce E. Jaffe, Alan R. Nelson, Klaus Reicherter
Unravelling the complexity of magma plumbing at Mount St. Helens: A new trace element partitioning scheme for amphibole
Volcanoes at subduction zones reside above complex magma plumbing systems, where individual magmatic components may originate and interact at a range of pressures. Because whole-rock compositions of subduction zone magmas are the integrated result of processes operating throughout the entire plumbing system, processes such as mixing, homogenisation and magma assembly during shallow storage can ove
Authors
Madeleine C. S. Humphreys, George F. Cooper, Jing Zhang, Matthew W. Loewen, Adam J. R. Kent, Colin G. Macpherson, Jon P. Davidson
Marshes are the new beaches: Integrating sediment transport into restoration planning
Recent coastal storms and associated recovery efforts have led to increased investment in nature-based coastal protection, including restoration of salt marshes and construction of living shorelines. In particular, many of these efforts focus on increasing vertical elevation through sediment nourishment, where sediment is removed from the tidal channel and placed on the marsh plain, or preventing
Authors
Neil K. Ganju
Rayleigh wave ellipticity measurement uncertainty across the IRIS/USGS and New China Digital Seismograph Networks
Long-period Rayleigh wave horizontal to vertical amplitude (H/V) ratios at a station provide information about local earth structure that is complementary to phase velocity. However, a number of studies have observed that significant scatter appears in these measurements making it difficult to use H/V ratio measurements to resolve earth structure. Some of the scatter in these measurements has been
Authors
Adam T. Ringler, David C. Wilson, Walter Zürn, Robert E. Anthony