The Rattlesnake Ash-Flow Tuff erupted 7.05±0.01 Ma from the western Harney Basin, southeastern Oregon. The location of the vent area is inferred based on vent-ward increases in size of pumices, in degree of welding, and in degree of post-emplacement crystallization. Today's outcrops cover 9000 km2 and estimated original outcrop coverage...
Aerial videography in combination with GPS were used to monitor the
active surge of Alaska's Bering Glacier. The large aerial extent of the study area and the
unpredictable weather in coastal Alaska required innovative techniques to be used in
order to successfully monitor the surge environment. A portable aerial videographic...
This project focuses on the classification of
vegetation as a habitat for wild turkeys. The
vegetation classification discussed here is only one
part of a study looking at habitat requirements,
seasonal use patterns, and brood-rearing habits of
wild turkeys in Southern Oregon. The vegetation
classification was performed for an area...
More efficient methods are needed for the in-situ evaluation of mass transfer parameters which describe the movement of solutes through aquifer material. The objective of this study was to develop a method for estimating diffusion rate and capacity coefficients using a single-well, "push-pull" tracer test. The method consists of the...
Outdoor recreational activities on public lands have increased dramatically in the past few
decades. Americans are logging millions of recreational visitor days (RVD's) participating in
activities such as hiking, biking, wildlife viewing, photography and many others. This increased
participation though is having detrimental effects on these lands and the agencies...
Louisiana Army Ammunition Plant (LAAP), located near Shreveport, Louisiana, is a
government-owned contractor-operated plant. Its purpose is to manufacture, load and
assemble ammunition items. Area P has been used over the past 40 years to dump
explosive-laden wastewater into 16 unlined lagoons. In 1989 LAAP was placed on the
National...
Water right marketing and transfers represent a resource reallocation
strategy that has received considerable attention in the American West owing to
nearly full appropriation of water in the region. Several western states permit
transfers between different uses and places of use thus allowing water to move to
higher-value economic activities....
Since the eruption of Mount St. Helens on May 18,1980, the rural communities within its shadow have experienced tremendous change. Tourism has become a highly visible and somewhat controversial component of change in the region, and its importance to local economies has increased. As a result of increased tourism development...
Three-dimensional gravity analysis is the process of removing the predictable
components from the free-air gravity anomalies and has proven to be useful for
interpreting the subsurface structures and active processes at mid-ocean ridges. The
three-dimensional effects of the seafloor and Moho topography, assuming a constant
crustal thickness and constant crust...
Surface and subsurface data from the Sulaiman thrust belt show that nearly all
the 10 km thick sequence of dominantly platform (>7 km) and molasse strata is detached
at the deformation front. These strata thicken tectonically to a minimum of 20 km in the
hinterland of the Sulaiman fold belt...
Because of declines in salmon populations in recent years, the health of salmon habitat, in particular, is the focus of many resource agencies. The objective of this study is to use GIS to predict the location of suitable habitat. With data from an extensive set of stream surveys, GIS was...
The purpose of this paper is to evaluate the extent to which ecological
principles were used in four documents of differing scope and intent, that address
management of forest resources and riparian zones in three National Forests of the
Pacific Northwest. We use the phrase "ecological principles" in a very...
Research Questions:
1) What are the characteristics of storm location and
frequency that distinguish interannual forcing events, (ENSO
periods) for the northwest Pacific Coast?
2) Are there differences in the spatial and temporal
characteristics of storm events, (location and frequency),
between interannual forcing periods and annual average
periods?
3) Are...
Instream flow protection in western prior appropriation states is a relatively new phenomenon.
Integrating instream flow protection measures with the older water law has been accomplished with varying
degrees of success. Idaho relies on appropriation of unappropriated water by the Idaho Water Resource Board
for protection of instream flows. Idaho's...
Eleven sedimentary and volcanic rock units are mapped and described in the thesis area, and chronicle the dynamic geologic history of the Tillamook embayment from the Oligocene through the middle Mlocene. The
oldest unit is the Zemorrian to early Saucesian Smuggler Cove formation, a bathyal tuffaceous mudstone with some thin-...
Ragay Gulf and Burias Pass are among the traditional fishing grounds of the
country being considered by the government for an integrated approach to fishery
management (Smith, et al., 1980; Samson, et al., 1977, World Bank, 1976). The
Department of Marine Fisheries, College of Fisheries, University of the Philippines in...
The National Oceanic and Atmospheric Administration (NOAA) Coastal Change Analysis Program (C-CAP) is developing a nationally standardized database on landcover and habitat change in the coastal regions of the United States. The Willapa Bay eelgrass mapping project was granted to the Columbia River Estuary Study Task force (CREST) of Astoria,...
Purpose
The purpose of this project is to aid the Umpqua Regional Council of Governments as
they try to identify buildable lands in Douglas County, Oregon particularly in the cities of
Reedsport and Sutherlin. This project will help Reedsport upgrade its recently completed
Buildable Lands Inventory and provide Sutherlin with...
This project explores the impact of land use decisions on dune processes at the
Oregon National Guard's Camp Rilea. located on the north coast of Oregon. It
used a combined analysis of historical and modern data sources to assess the
impact of land use practices. Historical sources including the journals...
Oregon's agricultural land use goal, (Goal 3), was
established to protect farm land. Land designated as
Exclusive Farm Use is subject to various use provisions and
permit review criteria. Golf courses are permitted in the
EFU zone when they will not significantly change, or increase
the cost of, accepted farming...
A strong concern has been expressed with the siting of
container nurseries on high quality farmland in the Willamette
Valley. There have been claims that the nurseries don't use
the on site soil and potentially remove the soil on which they
locate permanently from crop production. This study has gathered...
The Absaroka volcanic province is the largest of Eocene volcanic fields in the northern Cordillera of the western U.S., and consists of 25,000 km2 of lava flows, shallow intrusions, ash-flow tuffs and volcaniclastic deposits. It is aligned with northwest-trending Precambrian lineaments, and includes the remains of at least ten volcanic...
The pattern of ownership imposed on the-forest landscape of Western
Oregon defines the boundaries in which differences in jurisdiction, regulation, and
land use operate. Road building is controlled by these factors, and in turn has an
effect on the cumulative effects of human utilization of the forest. This study
examined...
When the Spatial Data Transfer Standard is adopted as a Federal
Information Processing Standard, a Quality Report containing sections on lineage,
accuracy, logical consistency, and completeness will be required of agencies
producing digital cartographic data. This Quality Report diverges significantly from
the "U.S. National Map Accuracy Standards", in place for...
This study addressed the effects of hilislope and fiuvial processes on spatial
patterns of stream bed particle size at the watershed, reach and within-reach scales.
The study was conducted in Lookout Creek watershed, a fifth-order, 64 km2 basin in
the Western Cascades mountains of Oregon. Stream bed particle size was...
The purpose of this project, therefore, is to develop a GIS for a small
geographical area that is currently of high priority to the GLT. The development of this GIS will be documented in a sequential fashion, so that it may serve as a
framework for future endeavors. This paper...
This thesis explores the genesis of the ecoregion concept,
examines the conceptual development of ecoregion classification
systems, investigates applications of ecoregion classification
systems for a broad range of purposes, and discusses the prospects
for the further evolution of this concept. An ecoregion is an area
that exhibits patterns of homogeneity...
The key to developing successful environmental interpretation is sound
planning. This paper is a discussion of the principles of environmental interpretation
and how they apply to the planning process. The Coburg Wetland is a 21 acre
reserve located on the west side of lnterstate-5 in Coburg, Oregon. The city of...
The Calvin impact crater is an isolated, nearly circular subsurface structure of Late
Ordovician age in southwestern Michigan. The crater is defined by 110 on and gas test wells, has a rim to rim diameter of 6.2 km, an overall dimensional diameter of 8.5 km and
consists of a central...
The main theme of this research is the application of geographic techniques in a study involving environmental monitoring and analysis of the associations between landscape and in-stream characteristics in the Pacific Northwest. The geographic techniques used in this study include (1) geographic information systems (GIS) coupled with statistical analysis and...
Equal value gray scales are frequently employed by cartographers to choose gray tone area
symbols. Several researchers have tried to quantify perceived gray tone as a function of percent area inked or
reflectance but results have varied. The influence of pattern and texture on gray tone perception is considered
a...
On November 6, 1988, two strong earthquakes (Mw: 7.0 and 6.8) separated
by about 13 minutes occurred in Yunnan Province, China. The aftershocks located
by Kunming Telemetered Seismic Network form a lineament approximately 120 km
long and 20 km wide with the long dimension oriented approximately N30°W. The
epicenter of...
Methane flux was measured from northern Alaska Arctic Coastal Plain wetlands to assess the spatial and temporal variability of Arctic tundra emissions during the summers of 1987 through 1990. Initially, the role of vegetation in the release of methane from substrate to atmosphere was assessed. Methane emissions were shown to...
Eighty-seven brachiopod species are described and illustrated from a brachiopod fauna of the Cape Phillips Formation of Baillie Hamilton Island, Arctic Canada. Two new
families, Wangyuiidae and Rhynchotretidae, are proposed. Six new genera and forty-five
new species are recognized. New genera comprise: Flabellitesia, Wangyuia,
Pseudomendacella, Eoplectodonta (Paranisopleurella), Johnsonatrypa, and
Dicoelospirifer....
The middle to upper Eocene Tillamook Volcanics form the basement in the Rock Creek - Rocky Point area. These tholeiitic to alkalic basalts, basaltic andesites, and andesites were erupted as shield volcanoes seaward of the strandline ontop of an older deep-marine mudstone unit (Yamhill Formation) and an accreted portion of...
Since 1979, over $114 million of natural gas has been produced at the Mist Gas Field, currently the only commercial gas field in the Pacific Northwest. In the Mist Gas Field, the sandstone-dominated Clark and Wilson member of the upper Eocene Cowlitz
Formation is the reservoir and the overlying upper...
The Whittier fault forms the central part of a fault system extending
from the East Montebello fault at Whittier Narrows to the Elsinore fault,
which is traced as far as the Mexican border. The Whittier fault forms a
restraining bend in this fault system, resulting in uplift of the Puente...
The northern Los Angeles basin is influenced by two structural styles: the west-trending compressional Transverse Ranges to the north, and the strike-slip Peninsular Ranges to the south. The interaction of these two structural styles has resulted in a complex fold fault belt at the northern margin of the Los Angeles...
Both travel times and amplitudes of large offset refracted and reflected arrivals
observed during GLIMPCE (Great Lakes International Multidisciplinary Program on
Crustal Evolution) along line A in Lake Superior have been modeled using two-dimensional
ray tracing techniques. Forward modeling was used to iteratively refine an
initial velocity model that was...
Surface geology, seismic data, petroleum exploratory well data, and water well data
have been used to analyze the structural and tectonic history of the southern Willamette
Valley. Tertiary strata beneath the southern Willamette Valley appear to have had an early
Cascade or Clarno volcanic source to the east by the...
Surface-geology, oil-well, seismic-reflection, and magnetostratigraphic data are
integrated to evaluate structural style and shortening rate at the Himalayan front (Sub-Himalaya) of northwest India. The Sub-Himalaya, between the Main Boundary thrust
and the Himalayan Frontal fault, is the actively deforming front of the Himalaya. At
certain locations, the Himalayan Frontal fault...
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...
The mechanisms of pool maintenance were investigated in a small (width = 10 m,
drainage area = 18 km2), gravel-bed stream where pools are commonly associated with
large, in-channel obstructions. Measurements of boundary shear stress, scour and fill of
the stream bed, and bedload transport rate and grain-size distribution were...
Stream management and design recommendations related to the Salmon Habitat Recovery Program in the Pacific Northwest require area specific information concerning appropriate methods of stream classification, bankfull discharge recurrence intervals, and hydraulic geometry relationships. New region specific information, based on field measurements, is presented here. The Rosgen Classification of Natural...