Publications
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Quaternary-active faults and the role of inherited structures in the Sacramento-San Joaquin Delta, western Central Valley, northern California Quaternary-active faults and the role of inherited structures in the Sacramento-San Joaquin Delta, western Central Valley, northern California
Seismic sources and their associated hazards within the Sacramento-San Joaquin Delta region of north-central California are relatively poorly characterized as compared to other, more heavily studied regions of northern California, such as the San Francisco Bay Area. Here we present a synthesis of subsurface, bedrock geology, and geodetic datasets from the Delta and from the Coast Ranges...
Authors
Charles Cashman Trexler, Jack Willard, Belle E. Philibosian
Liquefaction timing and post-triggering seismic energy: A comparison of crustal and subduction zone earthquakes Liquefaction timing and post-triggering seismic energy: A comparison of crustal and subduction zone earthquakes
The objective of the study is to assess when liquefaction is triggered in a suite of ground motions following simplified approaches and measure the remaining post-triggering energy content of those ground motions. For liquefaction-induced deformations, current simplified analysis procedures do not directly incorporate temporal effects and rely on peak transient intensity measurements...
Authors
Trevor J. Carey, Atira Naik, Andrew James Makdisi, Henry Mason
Havasuw baj gwawg gnavg Havasuw baj gwawg gnavg
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 in the Havasupai language.
Authors
Carletta Tilousi, Jo Ellen Hinck
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 S. Jindal, Samuel P. D. Birch, Alexander G. Hayes, F. P. Ozyurt, A. Issah, S. Moruzzi, N. M. Barrington, Jason M. Soderblom, Randolph L. 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 A. Harris, Ahmed E. 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 Ellen 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 Ellen 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 C. 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 K. Saunders, Elizabeth S. Cochran, Julian Bunn, Annemarie S. Baltay Sundstrom, Sarah E. Minson, Colin T 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. J. Daubar, A. G. Hayes, Gail C. Collins, K. Craft, J. A. Rathbun, J.R. Spencer, D. Wyrick, Michael T. Bland, A. G. Davies, C. M. Ernst, Samuel Howell, Erin J. Leonard, Alfred S. McEwen, J. M. Moore, C. B. Phillips, L. Prockter, L. C. Quick, J. E. C. Scully, J. M. Soderblom, S. M. Brooks, M. Cable, M. E. Cameron, K. Chan, C. J. Chivers, M. Choukroun, Corey Cochrane, S. Diniega, A. J. Dombard, Catherine Elder, Christopher Gerekos, Christopher R. Glein, T Greathouse, C. Grima, Murthy Gudipati, K. L. Hand, C. Hansen, Paul Hayne, M. Hedman, K. Hughson, X. Jia, J. Lawrence, H. M. Meyer, H. L. Miller, Gerald Wesley 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 M. Hare, Randolph L. Kirk, Michael T. Bland, Donna M. Galuszka, Jason Laura, David Mayer, Bonnie L. Redding, Benjamin H Wheeler