Unified Interior Regions

Region 10: California-Great Basin

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Filter Total Items: 144
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Year Published: 2021

Ocean floor manganese deposits

Much of the dissolved Mn delivered to the oceans is slowly oxidized and precipitated alongside varying amounts of Fe into Mn and ferromanganese (FeMn) mineral deposits that occur extensively in the deep ocean wherever sediment accumulation is low and substrate is available. FeMn crusts grow as pavements on rock outcrops throughout the...

Mizell, Kira; Hein, James R.
Mizell, K., and Hein, J.R., 2020, Ocean floor manganese (Mn) deposits, in Elias S., and Alderton, D., (eds.), Encyclopedia of Geology, 2nd edition: Elsevier, p. 993-1001, https://doi.org/10.1016/B978-0-08-102908-4.00030-8.

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Year Published: 2021

Systematic characterization of morphotectonic variability along the Cascadia convergent margin: Implications for shallow megathrust behavior and tsunami hazards

Studies of recent destructive megathrust earth­quakes and tsunamis along subduction margins in Japan, Sumatra, and Chile have linked forearc mor­phology and structure to megathrust behavior. This connection is based on the idea that spatial varia­tions in the frictional behavior of the megathrust influence the tectono-morphological evolution of...

Watt, Janet; Brothers, Daniel

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Year Published: 2021

Sediment dynamics of a divergent bay–marsh complex

Bay–marsh systems, composed of an embayment surrounded by fringing marsh incised by tidal channels, are widely distributed coastal environments. External sediment availability, marsh-edge erosion, and sea-level rise acting on such bay–marsh complexes may drive diverse sediment-flux regimes. These factors reinforce the ephemeral and dynamic nature...

Nowacki, Daniel J. ; Ganju, Neil Kamal

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Year Published: 2021

Amazon sediment transport and accumulation along the continuum of mixed fluvial and marine processes

Sediment transfer from land to ocean begins in coastal settings and, for large rivers such as the Amazon, has dramatic impacts over thousands of kilometers covering diverse environmental conditions. In the relatively natural Amazon tidal river, combinations of fluvial and marine processes transition toward the ocean, affecting the transport and...

Nittrouer, Charles A.; DeMaster, David J.; Kuehl, Steven A.; Figueiredo, Alberto G.; Sternberg, Richard W.; Faria, L. Ercilio C.; Silveira, Odete M.; Allison, Meade A.; Kineke, Gail C.; Ogston, Andrea S.; Souza Filho, Pedro W.M.; Asp, Nils E.; Nowacki, Daniel J. ; Fricke, Aaron T.

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Year Published: 2020

Coastal permafrost erosion

Highlights• Since the early 2000s, erosion of permafrost coasts in the Arctic has increased at 13 of 14 sites with observational data that extend back to ca. 1960 and ca. 1980, coinciding with warming temperatures, sea ice reduction, and permafrost thaw.• Permafrost coasts along the US and Canadian Beaufort Sea experienced the largest increase in...

Jones, Benjamin M.; Irrgang, Anna M; Farquharson, Louise M.; Lantuit, Hugues; Whalen, Dustin; Ogorodov, Stanislav; Grigoriev, Mikhail; Tweedie, Craig E.; Gibbs, Ann E.; Strzelecki, Matt C; Baranskaya, Alisa; Belova, Nataliya; Sinitsyn, Anatoly; Kroon, Art; Maslakov, Alexey; Vieira, Gonçalo; Grosse, Guido; Overduin, Paul; Nitze, Ingmar; Maio, Christopher V.; Overbeck, Jacquelyn R.; Bendixen, Mette; Zagórski, Piotr; Romanovsky, Vladimir

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Year Published: 2020

Changing storm conditions in response to projected 21st century climate change and the potential impact on an arctic barrier island–lagoon system—A pilot study for Arey Island and Lagoon, eastern Arctic Alaska

Executive SummaryArey Lagoon, located in eastern Arctic Alaska, supports a highly productive ecosystem, where soft substrate and coastal wet sedge fringing the shores are feeding grounds and nurseries for a variety of marine fish and waterfowl. The lagoon is partially protected from the direct onslaught of Arctic Ocean waves by a barrier island...

Erikson, Li H.; Gibbs, Ann E.; Richmond, Bruce M.; Storlazzi, Curt D.; Jones, Benjamin M.; Ohman, Karin
Erikson, L.H., Gibbs, A.E., Richmond, B.M., Storlazzi, C.D., Jones, B.M., and Ohman, K.A., 2020, Changing storm conditions in response to projected 21st century climate change and the potential impact on an arctic barrier island–lagoon system—A pilot study for Arey Island and Lagoon, eastern Arctic Alaska: U.S. Geological Survey Open-File Report 2020–1142, 68, p., https://doi.org/10.3133/ofr20201142.

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Year Published: 2020

Probabilistic application of an integrated catchment-estuary-coastal system model to assess the evolution of inlet-interrupted coasts over the 21st century

Inlet-interrupted sandy coasts are dynamic and complex coastal systems with continuously evolving geomorphological behaviors under the influences of both climate change and human activities. These coastal systems are of great importance to society (e.g., providing habitats, navigation, and recreational activities) and are affected by both oceanic...

Bamunawala, J.; Dastgheib, Ali; Ranasinghe, Roshanka; van der Spek, Ad; Maskey, Shreedhar; Murray, A. Brad; Barnard, Patrick L.; Duong, Trang Minh; Sirisena, T.A.J.G.

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Year Published: 2020

Sphalerite oxidation in seawater with covellite: Implications for seafloor massive sulfide deposits and mine waste

Metal sulfide minerals exist in several marine environments and are in thermodynamic disequilibrium with oxygenated seawater from the time of their formation. Oxidation is both ubiquitous and heterogeneous, as observational and experimental evidence demonstrates that sulfide minerals may oxidize completely on decadal timescales (hydrothermal...

Gartman, Amy; Whisman, Samantha P.; Hein, James R.

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Year Published: 2020

Seismic attenuation monitoring of a critically stressed San Andreas fault

We show that seismic attenuation ( ) along the San Andreas fault (SAF) at Parkfield correlates with the occurrence of moderate‐to‐large earthquakes at local and regional distances. Earthquake‐related  anomalies are likely caused by changes in permeability from dilatant static stress changes, damage by strong shaking from local...

Malagnini, Luca; Parsons, Thomas E.

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Year Published: 2020

Focused fluid flow and methane venting along the Queen Charlotte fault, offshore Alaska (USA) and British Columbia (Canada)

Fluid seepage along obliquely deforming plate boundaries can be an important indicator of crustal permeability and influence on fault-zone mechanics and hydrocarbon migration. The ~850-km-long Queen Charlotte fault (QCF) is the dominant structure along the right-lateral transform boundary that separates the Pacific and North American tectonic...

Prouty, Nancy G.; Brothers, Daniel; Kluesner, Jared; Barrie, J. Vaughn; Andrews, Brian D.; Lauer, Rachel; Greene, Gary; Conrad, James E.; Lorenson, Thomas; Law, Michael D.; Sahy, Diana; Conway, Kim; McGann, Mary; Dartnell, Peter

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Year Published: 2020

Geomorphic and sedimentary effects of modern climate change: Current and anticipated future conditions in the western United States

Hydroclimatic changes associated with global warming over the past 50 years have been documented widely, but physical landscape responses are poorly understood thus far. Detecting sedimentary and geomorphic signals of modern climate change presents challenges owing to short record lengths, difficulty resolving signals in stochastic natural systems...

East, Amy E.; Sankey, Joel B.