Publications
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Airborne dust plumes lofted by dislodged ice blocks at Russell crater, Mars Airborne dust plumes lofted by dislodged ice blocks at Russell crater, Mars
Linear dune gullies on poleward‐facing Martian slopes are enigmatic. Formation by CO2‐ice block or snow cornice falls has been proposed based on optical imagery of bright, high‐albedo features inside gully channels. Because these features often resemble patchy frost residue rather than three‐dimensional blocks, more evidence is needed to support the ice‐block formation mechanism...
Authors
Cynthia Dinwiddie, Timothy N. Titus
Extreme Quaternary plate boundary exhumation and strike slip localized along the southern Fairweather fault, Alaska, USA Extreme Quaternary plate boundary exhumation and strike slip localized along the southern Fairweather fault, Alaska, USA
The Fairweather fault (southeastern Alaska, USA) is Earth’s fastest-slipping intracontinental strike-slip fault, but its long-term role in localizing Yakutat–(Pacific–)North America plate motion is poorly constrained. This plate boundary fault transitions northward from pure strike slip to transpression where it comes onshore and undergoes a 6–8 km/m.y. exhumation rates that increases in...
Authors
Richard O. Lease, Peter J. Haeussler, Robert C. Witter, Daniel F. Stockli, Adrian Bender, Harvey Kelsey, Paul O’Sullivan
Amateur radio operators help fill earthquake donut holes Amateur radio operators help fill earthquake donut holes
If you’ve ever seen tall antennas rising from everyday residences in your community and wondered what they are for, it could be that those homes belong to ham radio enthusiasts who enjoy communicating with each other over the airwaves. In addition to having fun with their radios and finding camaraderie, many ham radio operators are also prepared to help neighbors and authorities...
Authors
David J. Wald, Vince Quitoriano, Oliver Dully
Response study of a 51-story-tall Los Angeles, California building inferred from motions of the Mw7.1 July 5, 2019 Ridgecrest, California earthquake Response study of a 51-story-tall Los Angeles, California building inferred from motions of the Mw7.1 July 5, 2019 Ridgecrest, California earthquake
A 51-story building in downtown Los Angeles that is equipped with a seismic monitoring accelerometric array recorded the Mw7.1 Ridgecrest, California earthquake of July 5, 2019. The building is a dual-core reinforced-concrete shear-wall and perimeter-column structure with ~ 80% of floors constructed as post-tensioned flat slabs, which makes it a trending design. Using system...
Authors
Mehmet Celebi, Dan Swensen, Hamid Haddadi
A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing A 100-km wide slump along the upper slope of the Canadian Arctic was likely preconditioned for failure by brackish pore water flushing
Exploration of the continental slope of the Canadian Beaufort Sea has revealed a remarkable coalescence of slide scars with headwalls between 130 and 1100 m water depth (mwd). With increased depth, the scars widen and merge into one gigantic regional slide scar that is more than 100 km wide below ~1100 mwd. To understand the development of these features, five sites were investigated...
Authors
C. K. Paull, S.R. Dallimore, D.W. Caress, R. Gwiazda, E. Lundsten, K. Anderson, H. Melling, Y.K. Jin, M.J. Duchesne, Kang S-G., S. Kim, M. Riedel, E.L. King, Thomas Lorenson
Evolution of fluid transmissivity and strength recovery of shear fractures under hydrothermal conditions Evolution of fluid transmissivity and strength recovery of shear fractures under hydrothermal conditions
Geothermal systems rely on the presence of long-lived and high-volume, permeable fracture systems. The creation, reactivation, and sustainability of these systems depend on complex coupling among thermal, hydraulic, mechanical, and chemical (THMC) processes occurring in geothermal reservoirs. In part due to a paucity of experimental data, the evolution of fractures at geothermal...
Authors
Tamara Nicole Jeppson, David A. Lockner, Brian D. Kilgore, Nicholas M. Beeler, Joshua M. Taron
Long-term changes in kelp forests in an inner basin of the Salish Sea Long-term changes in kelp forests in an inner basin of the Salish Sea
Kelp forests form an important biogenic habitat that responds to natural and human drivers. Global concerns exist about threats to kelp forests, yet long-term information is limited and research suggests that trends are geographically distinct. We examined distribution of the bull kelp Nereocystis luetkeana over 145 years in South Puget Sound (SPS), a semi-protected inner basin in a...
Authors
H.D. Berry, T.F. Mumford, M. Calloway, L. Ferrier, B. Christiaen, P. Dowty, Eric E. Grossman, Nathan R. vanArendonk
The Mars 2020 Perseverance rover mast camera zoom (Mastcam-Z) multispectral, stereoscopic imaging investigation The Mars 2020 Perseverance rover mast camera zoom (Mastcam-Z) multispectral, stereoscopic imaging investigation
Mastcam-Z is a multispectral, stereoscopic imaging investigation on the Mars 2020 mission’s Perseverance rover. Mastcam-Z consists of a pair of focusable, 4:1 zoomable cameras that provide broadband red/green/blue and narrowband 400-1000 nm color imaging with fields of view from 25.6° × 19.2° (26 mm focal length at 283 μrad/pixel) to 6.2° × 4.6° (110 mm focal length at 67.4 μrad/pixel)...
Authors
J. F. Bell, J. N. Maki, G. L. Mehall, M. A. Ravine, M. A. Caplinger, Z. J. Bailey, S. Brylow, J. A. Schaffner, K. M. Kinch, M. B. Madsen, A. Winhold, A. G. Hayes, P. Corlies, C. Tate, M. Barrington, E. Cisneros, E. Jensen, Katy L. Parise, Kelon Crawford, C. Rojas, L. Mehall, J. Joseph, J. B. Proton, N. Cluff, R. G. Deen, B. Betts, Edward A. Cloutis, A. J. Coates, Anthony Colaprete, K. S. Edgett, B. L. Ehlmann, Sarah A. Fagents, J. P. Grotzinger, C. Hardgrove, Kenneth E. Herkenhoff, Briony H. N. Horgan, R. Jaumann, J. R. Johnson, M. T. Lemmon, G. Paar, M Caballo-Perucha, S. Gupta, C Traxler, F. Preusker, M. S. Rice, M. S. Robinson, N. Schmitz, R. Sullivan, M. J. Wolff
The contribution of currents, sea-swell waves, and infragravity waves to suspended-sediment transport across a coral reef-lagoon system. The contribution of currents, sea-swell waves, and infragravity waves to suspended-sediment transport across a coral reef-lagoon system.
Coral reefs generate substantial volumes of carbonate sediment, which is redistributed throughout the reef‐lagoon system. However, there is little understanding of the specific processes that transport this sediment produced on the outer portions of coral reefs throughout a reef‐lagoon system. Furthermore, the separate contributions of currents, sea‐swell waves, and infragravity waves to...
Authors
Andrew Pomeroy, Curt D. Storlazzi, Kurt J. Rosenberger, Ryan Lowe, Jeff Hansen, Mark L. Buckley
Electrical conductivity of the lithosphere-asthenosphere system Electrical conductivity of the lithosphere-asthenosphere system
Electromagnetic geophysical methods image the electrical conductivity of the subsurface. Electrical conductivity is an intrinsic material property that is sensitive to temperature, composition, porosity, volatile and/or melt content, and other physical properties relevant to the solid Earth. Therefore, imaging the electrical structure of the crust and mantle yields valuable information...
Authors
Samer Naif, Kate Selway, Benjamin Scott Murphy, Gary D. Egbert, Anne Pommier
The application of ensemble wave forcing to quantify uncertainty of shoreline change predictions The application of ensemble wave forcing to quantify uncertainty of shoreline change predictions
Reliable predictions and accompanying uncertainty estimates of coastal evolution on decadal to centennial time scales are increasingly sought. So far, most coastal change projections rely on a single, deterministic realization of the unknown future wave climate, often derived from a global climate model. Yet, deterministic projections do not account for the stochastic nature of future...
Authors
Sean Vitousek, Laura Cagigal, Jennifer Montano, Ana Rueda, Fernando Mendez, Giovanni Coco, Patrick L. Barnard
Availability of subsurface water-ice resources in the northern mid-latitudes of Mars Availability of subsurface water-ice resources in the northern mid-latitudes of Mars
Multiple nations and private entities are pushing to make landing humans on Mars a reality. The majority of proposed mission architectures envision ‘living off the land’ by leveraging Martian water-ice deposits for fuel production and other purposes. Fortunately for mission designers, water ice exists on Mars in plentiful volumes. The challenge is isolating accessible ice deposits within...
Authors
Gareth A Morgan, Nathaniel E Putzig, Matthew R Perry, Hanna G Sizemore, Ali M Bramson, Eric I Petersen, Zach M Bain, David M H Baker, Marco Mastrogiuseppe, Rachel H Hoover, Isaac B. Smith, Asmin V Pathare, Colin M. Dundas, Bruce A Campbell