Publications
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Measuring erosional and depositional patterns across Comet 67P's imhotep region Measuring erosional and depositional patterns across Comet 67P's imhotep region
Comet 67P/Churyumov-Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology, where the southern hemisphere exhibits more erosional features than the northern hemisphere due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from the southern hemisphere through sublimation and a significant fraction...
Authors
Abhinav Jindal, Samuel Birch, Alexander Hayes, F. Ozyurt, A. Issah, S. Moruzzi, N. Barrington, Jason Soderblom, Randolph Kirk, R. Marschall, J.-B. Vincent
Rupture jumping and seismic complexity in models of earthquake cycles for fault stepovers with off‐fault plasticity Rupture jumping and seismic complexity in models of earthquake cycles for fault stepovers with off‐fault plasticity
Fault stepovers are prime examples of geometric complexity in natural fault zones that may affect seismic hazard by determining whether an earthquake rupture continues propagating or abruptly stops. However, the long‐term pattern of seismicity near‐fault stepovers and underlying mechanisms of rupture jumping in the context of earthquake cycles are rarely studied. Leveraging a hybrid...
Authors
Shumon Mia, Mohamed Abdelmeguid, Ruth Harris, Ahmed Elbanna
Conceptual risk framework—Havasupai perspective Conceptual risk framework—Havasupai perspective
The conceptual risk framework, previously developed by the U.S. Geological Survey, for uranium mining was updated to include indigenous knowledge components informed by the Havasupai Tribe perspective. This General Information Product was designed to show the contaminant risk framework from the Havasupai perspective.
Authors
Carletta Tilousi, Jo Hinck
Contaminant exposure framework—Havasupai perspective Contaminant exposure framework—Havasupai perspective
The conceptual risk framework, previously developed by the U.S. Geological Survey, for uranium mining was updated to include indigenous knowledge components informed by the Havasupai Tribe perspective. This General Information Product was designed to show the contaminant exposure framework from the Havasupai perspective.
Authors
Carletta Tilousi, Jo Hinck
GRACE and GRACE Follow-On gravity observations of intermediate-depth earthquakes contrasted with those of shallow events GRACE and GRACE Follow-On gravity observations of intermediate-depth earthquakes contrasted with those of shallow events
Earthquakes involve mass redistribution within the solid Earth and the ocean, and as a result, perturb the Earth's gravitational field. For most of the shallow ( 8.0, the GRACE satellite gravity measurements suggest considerable volumetric disturbance of rocks. At a spatial scale of hundreds of km, the effect of volumetric change exceeds gravity change by vertical deformation; for...
Authors
Shin-Chan Han, Jeanne Sauber, Taco Broerse, Frederick Pollitz, Emile Okal, Taehwan Jeon, Ki-Weon Seo, Richard Stanaway
Rotation of the microplates within the plate boundary in southwestern United States Rotation of the microplates within the plate boundary in southwestern United States
I investigate the long‐term, rigid motions of the 20 microplates identified by McCaffrey (2005,https://doi.org/10.1029/2004jb003307) within the Pacific‐North America plate boundary in southwestern United States. Those motions are described by the Euler vectors ( Ωi0 for the ith microplate) given by McCaffrey for each microplate. McCaffrey noticed that the Euler poles for those...
Authors
James Savage
Incorporating intensity distance attenuation into PLUM ground-motion-based earthquake early warning in the United States: The APPLES configuration Incorporating intensity distance attenuation into PLUM ground-motion-based earthquake early warning in the United States: The APPLES configuration
We develop Attenuated ProPagation of Local Earthquake Shaking (APPLES), a new configuration for the United States West Coast version of the Propagation of Local Undamped Motion (PLUM) earthquake early warning (EEW) algorithm that incorporates attenuation into its ground-motion prediction procedures. Under APPLES, instead of using a fixed radius to forward-predict observed peak ground...
Authors
Jessie Saunders, Elizabeth Cochran, Julian Bunn, Annemarie Baltay Sundstrom, Sarah Minson, Colin O’Rourke
Planned geological investigations of the Europa Clipper mission Planned geological investigations of the Europa Clipper mission
Geological investigations planned for the Europa Clipper mission will examine the formation, evolution, and expression of geomorphic structures found on the surface. Understanding geologic features, their formation, and any recent activity are key inputs in constraining Europa’s potential for habitability. In addition to providing information about the moon’s habitability, the geologic...
Authors
I. Daubar, A. Hayes, Gail Collins, K. Craft, J. Rathbun, J.R. Spencer, D. Wyrick, Michael Bland, A. Davies, C. Ernst, Samuel Howell, Erin Leonard, Alfred McEwen, J. Moore, C. Phillips, L. Prockter, L. Quick, J. Scully, J. Soderblom, S. Brooks, M. Cable, M. Cameron, K. Chan, C. Chivers, M. Choukroun, Corey Cochrane, S. Diniega, A. Dombard, Catherine Elder, Christopher Gerekos, Christopher Glein, T Greathouse, C. Grima, Murthy Gudipati, K. Hand, C. Hansen, Paul Hayne, M. Hedman, K. Hughson, X. Jia, J. Lawrence, H. Meyer, H. Miller, Gerald Patterson, D Persaud, S. Piqueux, K. Retherford, Kirk Scanlan, P. Schenk, B. Schmidt, D. Schroeder, Gregor Steinbrugge, A. Stern, Gabriel Tobie, Paul Withers, D. A. Young, B. Buratti, Haje Korth, D. Senske, Robert Pappalardo
Current status of the community sensor model standard for the generation of planetary digital terrain models Current status of the community sensor model standard for the generation of planetary digital terrain models
The creation of accurate elevation models (topography) from stereo images are critical for a large variety of geospatial activities, including the production of digital orthomosaics, change detection, landing site analysis, geologic mapping, rover traverse planning, and spectral analysis. The United Stated Geological Survey, Astrogeology Science Center, continues to transition the...
Authors
Trent Hare, Randolph Kirk, Michael Bland, Donna Galuszka, Jason Laura, David Mayer, Bonnie Redding, Benjamin Wheeler
Stress-driven recurrence and precursory moment-rate surge in caldera collapse earthquakes Stress-driven recurrence and precursory moment-rate surge in caldera collapse earthquakes
Predicting the recurrence times of earthquakes and understanding the physical processes that immediately precede them are two outstanding problems in seismology. Although geodetic measurements record elastic strain accumulation, most faults have recurrence intervals longer than available measurements. Foreshocks provide the principal observations of processes before mainshocks, but...
Authors
Paul Segall, Mark V. Matthews, David Shelly, Taiyi Wang, Kyle Anderson
Forecasting storm-induced coastal flooding for 21st century sea-level rise scenarios in the Hawaiian, Mariana, and American Samoan Islands Forecasting storm-induced coastal flooding for 21st century sea-level rise scenarios in the Hawaiian, Mariana, and American Samoan Islands
Oceanographic, coastal engineering, ecologic, and geospatial data and tools were combined to evaluate the increased risks of storm-induced coastal flooding in the populated Hawaiian, Mariana, and American Samoan Islands as a result of climate change and sea-level rise. We followed a hybrid (dynamical and statistical) downscaling approach to map flooding due to waves and storm surge at 10...
Authors
Curt Storlazzi, Borja Reguero, Camila Gaido L., Kristen Alkins, Chris Lowry, Cornelis Nederhoff, Li Erikson, Andrea C. O'Neill, Michael Beck
Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model Earthquake rupture forecast model construction for the 2023 U.S. 50‐State National Seismic Hazard Model Update: Central and eastern U.S. fault‐based source model
As part of the U.S. Geological Survey’s 2023 50‐State National Seismic Hazard Model (NSHM), we make modest revisions and additions to the central and eastern U.S. (CEUS) fault‐based seismic source model that result in locally substantial hazard changes. The CEUS fault‐based source model was last updated as part of the 2014 NSHM and considered new information from the Seismic Source
Authors
Allison Shumway, Mark Petersen, Gabriel Toro, Peter Powers, Jason Altekruse, Julie Herrick, Kenneth S. Rukstales, Jessica Jobe, Alexandra Hatem, Demi Girot