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  • Regional scale sandbar variability : observations from the U.S. Pacific Northwest

    Creator:
    Di Leonardo, Diana R.
    Abstract:
    Understanding sandbar dynamics and variability is integral to developing a predictive capacity for nearshore flows, sediment transport, morphological change, and ultimately for determining coastline exposure to damaging storm waves. Along the high-energy U.S. Pacific Northwest (PNW) coast, sandbars typically dominate the bathymetry of the active zone. Here we report on...
    Resource Type:
    Masters Thesis
    Full Text:
    . ........................................................................................... 54 Regional Scale Sandbar Variability: Observations from the U.S. Pacific Northwest

  • The effects of the Mazama tephra-falls : a geoarchaeological approach

    Creator:
    Matz, Stephan E.
    Abstract:
    About 7,000 years ago two major tephra-falls blanketed the Pacific Northwest in volcanic ash. These two tephra-falls, identified as the Llao and climatic tephra-falls, were a part of the eruptive events that led up to the collapse of Mount Mazama to form Crater Lake in the southern Oregon Cascades. The...
    Resource Type:
    Masters Thesis
    Full Text:
    , and human populations of the Pacific Northwest. Such a complex study has unique needs and must be

  • Developing climate records from speleothems, Oregon Caves National Monument, Oregon

    Creator:
    Vacco, David A.
    Abstract:
    A stalagmite (sample OCNM8-02A) collected from Oregon Caves National Monument (OCNM) was sampled for stable isotope ratios in order to develop a record of Pacific Northwest climate history. Nine U-series dates indicate that the record spans the time period - 13.5 - 9.5 ka. The stalagmite growth rate varied from...
    Resource Type:
    Masters Thesis
    Full Text:
    indicates that the climate of the Pacific Northwest during the last deglaciation changed synchronously

  • Structure and seismic hazards of the offshore Cascadia forearc and evolution of the Neogene forearc basin

    Creator:
    McNeill, Lisa C.
    Abstract:
    The Cascadia subduction zone has been characterized as a typical Chilean-type subduction zone based on qualitative comparisons of plate age and convergence rate, with simple forearc structure. However, the discovery of unusual structural styles of deformation, variations in the morphology of the forearc, and its absence of seismic activity suggest...
    Resource Type:
    Dissertation
    Full Text:
    potential seismic and tsunami hazards that the communities of the Pacific Northwest may face from this

  • Changing landscape, climate, and life during the age of mammals: interpreting paleontology, evolving ecosystems, and climate change in the Cenozoic fossil parks

    Creator:
    Kenworthy, Jason P.
    Abstract:
    This thesis develops a manual for interpreters at six National Park Service areas established to preserve and interpret fossils of the Cenozoic Era: Fossil Butte National Monument (Wyoming), John Day Fossil Beds National Monument (Oregon), Badlands National Park (South Dakota), Florissant Fossil Beds National Monument (Colorado), Agate Fossil Beds National...
    Resource Type:
    Masters Thesis
    Full Text:
    operated along the Pacific Northwest coast for more than 100 million years (Box 4.4) ... 92 4.8 Location

  • Past climate variability in southwestern Oregon and relationships with regional and hemispheric climate

    Creator:
    Ersek, Vasile
    Abstract:
    This dissertation presents the results of three studies that assessed climate variability on short and long timescales in western United States. The growth of carbonate formations in caves (speleothems) is used to infer the timing and amplitude of past climate variability. We first assess the controls on speleothem growth for...
    Resource Type:
    Dissertation
    Full Text:
    ). The seasonal and annual climate of the Pacific Northwest (PNW) is strongly influenced by atmosphere

  • Submarine earthquakes, volcanic eruptions and ambient noise in the Northeast Pacific

    Creator:
    Haxel, Joseph H.
    Abstract:
    Passive hydrophone technologies and a variety of acoustic methods are applied in the deep-ocean and shallow water coastal environments of the northeast Pacific. A catalog derived from U.S. Navy regional hydrophone array recordings of acoustic T- phases from seafloor earthquakes is examined, describing space/time patterns through empirical orthogonal function analysis...
    Resource Type:
    Dissertation
    Full Text:
    map of the Pacific Northwest coast showing the location of the study (right

  • From the Shoreface to the Foredunes : Coastal Morphodynamics Across the Land-Sea Interface

    Creator:
    Cohn, Nicholas T.
    Abstract:
    Coastal flooding and erosion are major concerns for low lying coastal communities -- particularly in light of accelerated sea level rise and climate change. To improve quantitative understanding of the physical drivers of both flooding and coastal landscape change, this dissertation explores coastal morphodynamics bridging the land-sea interface on modally...
    Resource Type:
    Dissertation
    Date Created:
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.1 (a) Regional map of the U.S. Pacific Northwest with the two field sites iden- tified. Zoomed

  • Acoustic monitoring of earthquakes along the Blanco Transform Fault Zone and Gorda plate and their tectonic implications

    Creator:
    Dziak, Robert P.
    Abstract:
    Hydroacoustic tertiary (T-) waves are seismically generated acoustic waves that propagate over great distances in the ocean sound channel with little loss in signal strength. Hydrophone recorded T-waves can provide a lower earthquake detection threshold and an improved epicenter location accuracy for oceanic earthquakes than land-based seismic networks. Thus detection...
    Resource Type:
    Dissertation
    Full Text:
    location of NE Pacific ocean earthquakes along the Blanco Transform Fault (BTFZ) and Gorda plate using the

  • Magnetotelluric Constraints on Lithospheric Properties in the Southeastern United States

    Creator:
    Murphy, Benjamin S.
    Abstract:
    By inverting EarthScope long-period magnetotelluric (MT) data from the southeastern United States (SEUS), we obtain electrical conductivity images that provides key insights into the geodynamics of this region. Significantly, we resolve a highly electrically resistive block that extends to mantle depths beneath the modern Piedmont and Coastal Plain physiographic provinces....
    Resource Type:
    Dissertation
    Full Text:
    modern Piedmont and Coastal Plain physiographic provinces. As high resistivity values in mantle