Publications
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Honolulu Magnetic Observatory Honolulu Magnetic Observatory
Tucked in a grove of thorny mesquite trees, on an ancient coral reef on the south side of the Hawaiian island of Oahu, west of Pearl Harbor, a small unmanned observatory quietly records the Earth’s time-varying magnetic field. The Honolulu Magnetic Observatory is 1 of 14 that the U.S. Geological Survey Geomagnetism Program operates at various locations across the United States and its...
Authors
Jeffrey J. Love, Carol Finn
The extreme space weather event in September 1909 The extreme space weather event in September 1909
We evaluate worldwide low-latitude auroral activity associated with the great magnetic storm of September 1909 for which a minimum Dst value of −595 nT has recently been determined. From auroral observations, we calculate that the equatorward boundary of the auroral oval in the 1909 event was in the range from 31°–35° invariant latitude (assuming auroral height of 400 km) to 37°–38° (800...
Authors
Hisashi Hayakawa, Yusuke Ebihara, Edward W. Cliver, Kentaro Hattori, Shin Toriumi, Jeffrey J. Love, Norio Umemura, Kosuke Namekata, Takahito Sakaue, Takuya Takahashi, Kazunari Shibata
Revisiting earthquakes in the Los Angeles, California, basin during the early instrumental period: Evidence for an association with oil production Revisiting earthquakes in the Los Angeles, California, basin during the early instrumental period: Evidence for an association with oil production
A total of seven independent ML ≥ 4.0 earthquakes occurred in the Los Angeles, California, basin, during the early instrumental period between 1932 and 1952, the largest of which was the 1933 Long Beach earthquake. Revising available macroseismic and instrumental data for a total of 6 4.0 ≤ ML ≤ 5.1 events between 1938 and 1944, we conclude that early instrumental locations can be...
Authors
Susan E. Hough, Roger Bilham
Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic Margin Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic Margin
The Cape Fear Slide is one of the largest (>25 000 km3) submarine slope failure complexes on the US Atlantic margin. Here we use a combination of new high-resolution multichannel seismic data (MCS) from the National Science Foundation Geodynamic Processes at Rifting and Subducting Margins (NSF GeoPRISMS) Community Seismic Experiment and legacy industry MCS to derive detailed stratigraphy...
Authors
Jenna C. Hill, Daniel S. Brothers, Matthew J. Hornbach, Derek E. Sawyer, Donna J. Shillington, Anne Becel
Degradation of 100‐m‐scale rocky ejecta craters at the InSight Landing Site on Mars and implications for surface processes and erosion rates in the hesperian and amazonian Degradation of 100‐m‐scale rocky ejecta craters at the InSight Landing Site on Mars and implications for surface processes and erosion rates in the hesperian and amazonian
Rocky ejecta craters (RECs) at the Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) landing site on Elysium Planitia, Mars, provide constraints on crater modification and rates for the Hesperian and Amazonian. The RECs are between 10 m and 1.2 km in diameter and exhibit five classes of preservation. Class 1 represents pristine craters with sharp...
Authors
J. Sweeney, N. H Warner, V. Ganti, Matthew P. Golombek, M. P. Lamb, Robin L. Fergason, Randolph L. Kirk
Inhibition of grain boundary sliding creep in fine-grained ice by inter-granular particles: Implications for planetary ice masses Inhibition of grain boundary sliding creep in fine-grained ice by inter-granular particles: Implications for planetary ice masses
Ice in both terrestrial and planetary settings often contains rock particles. Here we present an experimental investigation of the influence of intergranular particles on the rheological behavior of ice. Experiments were performed on samples fabricated from 10‐μm ice powders +1‐μm graphite or 0.8‐μm alumina particles and subjected to elevated confining pressures. A critical particle...
Authors
Chao Qi, Laura A. Stern, Asmin Pathare, William B. Durham, David L. Goldsby
Unmanned aerial systems capabilities of the U.S. Geological Survey Woods Hole Coastal and Marine Science Center Unmanned aerial systems capabilities of the U.S. Geological Survey Woods Hole Coastal and Marine Science Center
Unmanned aerial system (UAS) technology provides a rapid and low-cost solution for mapping coastal environments and assessing short- and long-term changes. The interdisciplinary nature of the data collected and the breadth of applications make UAS technology applicable to multiple scientific investigations. The Aerial Imaging and Mapping (AIM) group at the U.S. Geological Survey (USGS)...
Authors
Sandra Brosnahan, Christopher R. Sherwood
Do low-cost seismographs perform well enough for your network? An overview of laboratory tests and field observations of the OSOP Raspberry Shake 4D Do low-cost seismographs perform well enough for your network? An overview of laboratory tests and field observations of the OSOP Raspberry Shake 4D
Seismologists have recently begun utilizing low-cost nodal sensors in dense deployments to sample the seismic wavefield at unprecedented spatial resolution. Earthquake Early Warning Systems (EEWS) and other monitoring networks (e.g. wastewater injection) would additionally benefit from network densification; however, current nodal systems lack power systems and/or real-time data...
Authors
Robert E. Anthony, Adam T. Ringler, David C. Wilson, Emily Wolin
Uncertainty in United States coastal wetland greenhouse gas inventorying Uncertainty in United States coastal wetland greenhouse gas inventorying
Coastal wetlands store carbon dioxide (CO2) and emit CO2 and methane (CH4) making them an important part of greenhouse gas (GHG) inventorying. In the contiguous United States (CONUS), a coastal wetland inventory was recently calculated by combining maps of wetland type and change with soil, biomass, and CH4 flux data from a literature review. We assess uncertainty in this developing...
Authors
James Holmquist, Lisamarie Windham-Myers, Blanca Bernal, Kristin B. Byrd, Steve Crooks, Meagan Gonneea Eagle, Nathan Herold, Sara Knox, Kevin D. Kroeger, John McCombs, J. Patrick Megonigal, Lu Meng, James Morris, Ariana Sutton-Grier, Tiffany Troxler, Donald Weller
Spatiotemporal analysis of the Foreshock-Mainshock-Aftershock sequence of the 6 July 2017 M5.8 Lincoln, Montana, earthquake Spatiotemporal analysis of the Foreshock-Mainshock-Aftershock sequence of the 6 July 2017 M5.8 Lincoln, Montana, earthquake
A MW 5.8 earthquake occurred on 6 July 2017 at 12.2 km depth, 11 km southeast of Lincoln in west central Montana. No major damage or injuries were reported; however, the widely felt mainshock generated a prolific aftershock sequence with more than 1200 located events through the end of 2017. The Lincoln event is the latest in a series of moderate-to-large earthquakes that have affected...
Authors
Nicole D McMahon, William L. Yeck, Michael C. Stickney, Richard C. Aster, Hilary R Martens, Harley M. Benz
Contribution of hurricane-induced sediment resuspension to coastal oxygen dynamics Contribution of hurricane-induced sediment resuspension to coastal oxygen dynamics
Hurricanes passing over the ocean can mix the water column down to great depths and resuspend massive volumes of sediments on the continental shelves. Consequently, organic carbon and reduced inorganic compounds associated with these sediments can be resuspended from anaerobic portions of the seabed and re-exposed to dissolved oxygen (DO) in the water column. This process can drive DO...
Authors
Laura Bianucci, Karthik Balaguru, Richard W. Smith, Ruby Leung, Julia M. Moriarty
Natural climate solutions for the United States Natural climate solutions for the United States
Limiting climate warming to
Authors
Joseph E. Fargione, Steven Bassett, Timothy Boucher, Scott D. Bridgham, Richard T. Conant, Susan C. Cook-Patton, Peter W. Ellis, Alessandra Falcucci, James W. Fourqurean, Trisha Gopalakrishna, Huan Gu, Benjamin Henderson, Matthew D. Hurteau, Kevin D. Kroeger, Timm Kroeger, Tyler J. Lark, Sara M. Leavitt, Guy Lomax, Robert I. McDonald, Patrick Megonigal, Daniela A. Miteva, Curtis J. Richardson, Jonathan Sanderman, David Shoch, Seth A. Spawn, Joseph W. Veldman, Christopher A. Williams, Peter B. Woodbury, Chris Zganjar, Marci Baranski, Patricia Elias, Richard A. Houghton, Emily Landis, Emily McGlynn, William H. Schlesinger, Juha V. Siikamaki, Ariana Sutton-Grier, Bronson W. Griscom