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...