Results
626 - 650 of 881 Items << < 21 22 23 24 25 26 27 28 29 30 > >>
626 - 650 of 881 Items << < 21 22 23 24 25 26 27 28 29 30 > >>
|
A free-air gravity anomaly map of the area between 10°-17°N and
90°-101°W shows distinctive positive and negative anomalies which
parallel the Tehuatepec Ridge. The positive anomaly approximately
overlies the topographic expression of the ridge....
1975-07-17 (iso8601)
|
|
Detailed current profiles between the sediment-water interface
and 20 cm above it reveal a viscous sublayer in the bottom boundary
layer on the Oregon continental shelf. Data from three field experiments
are used to test fundamental assumptions...
1981-09-04 (iso8601)
|
|
Motivated by the general objective of pursuing oceanographic process and data assimilation studies of the complex, nonlinear eddy and jet current fields observed over the continental shelf and slope off the west coast of the United States, we...
1990-07 (iso8601)
|
|
Since 2003, 39 small earthquakes have been detected offshore central Oregon in the nominally locked part of the Cascadia subduction zone, where very little seis- mic activity has been recorded in spite of a paleo-seismic record of great subduction...
2011-08-16 (iso8601)
|
|
Data from Geostationary Operational Environmental
Satellites are used to study the seasonal evolution of
temperature fronts in the northern California Current
System (CCS), focusing on the interactions with
topographic features. Fronts first...
2005 (iso8601)
|
|
Anthropogenic nitrogen (N) deposition has had substantial impacts on forests of North America. Managers
seek to monitor deposition to identify areas of concern and establish critical loads, which define the
amount of deposition that can be...
2013-07-15 (iso8601)
|
|
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh...
1986-05-29 (iso8601)
|
|
This study was designed to provide a physical and ecological analysis of paired
watersheds in the semi-arid western juniper (Juniperus occidentalis) woodlands of
Central Oregon. Instrumentation and monitoring was accomplished in Jensen and Mays...
1996-01-26 (iso8601)
|
|
Newberry Volcano in central Oregon formed at the intersection of extensional fault systems defining the Basin and Range extensional province, the Cascades Graben and the Brothers Fault Zone. A unique structural orientation characterizes each fault...
2012-04-20 (iso8601)
|
|
We characterized the structure and composition of unmanaged riparian forests in three river basins in Oregon’s coastal mountains. Our objective was to evaluate stand attributes at three spatial scales: streamside (site), drainage network (stream...
1999 (iso8601)
|
|
Fire history and fire regimes were reconstructed for a 450 km² area in the central
western Oregon Cascades, using tree-ring analysis of fire scars and tree origin years at
137 sampled clearcuts. I described temporal patterns of fire frequency,...
1998-08-24 (iso8601)
|
|
The links between forests, streamflow, and climate are poorly understood. Despite hundreds of studies over the past 60 years, fundamental questions of forests' effects on the hydrologic cycle remain unanswered. The hydrological cycle involves...
2009-06-17T17:39:11Z (iso8601)
|
|
During the last decades, there has been increasing interest in ground-based
mechanized harvesting systems in the western United States as harvest of second growth
increased. A major reason for that interest is that labor productivity using...
1998-01-15 (iso8601)
|
|
Stream buffer strips are an important tool for protecting the stream environment. This research documents the losses from 40 stream buffer strips, in the Western Cascades of Oregon, established 1 to 15 years before the study. Predictive equations...
1977-06-22 (iso8601)
|
|
Many topographic units in the state of Oregon have been only partially explored botanically and very few areas have been collected intensively. Two such areas were selected and a detailed investigation was made of the vegetation. Fairview Mountain...
1949-04-16 (iso8601)
|
|
Throughout the 20th century, windthrow has affected forests in the Bull Run watershed, a 26,500 ha basin that is the principal water source for the city of Portland, Oregon. Windthrow from storms in 1973 and 1983 was mapped into a geographic...
1996-05-10 (iso8601)
|
|
Four formations of the Cretaceous Nanaimo Group crop out on Galiano Island and on Parker and Gossip Islands, nearby. These formations are: early Campanian Geoffrey Formation which encloses a tongue of the Northumberland Formation; early Campanian...
1976-06-03 (iso8601)
|
|
Rio Grande, New Mexico. Shows plan and profile of the Rio Grande from Otowi Station to Embudo Creek. Topography by D. H. Griswold, G. R. Griswold, and W. C. G. Senkpiel. Surveyed in 1933-1935. 1 plan sheet & 1 profile sheet. Sheet 1 of 2.
2024-05-05
|
|
58 x 47 cm., on sheet 74 x 84 cm., folded in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Bedrock geology mapped by B.C. Burchfiel, 1961, and by E.J. McKay and K.A. Sargent, 1965-66. Surficial geology mapped by A.T. Fernald,...
1970-05-05
|
|
57 x 46 cm., on sheet 83 x 91 cm., folded in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Geology mapped in 1963." Includes 2 colored cross sections, index map, text, and quadrangle location map. "Prepared in cooperation with...
1966-05-05
|
|
37 x 50 cm. Relief shown by hachures and spot heights "Atlas sheet no. 77(B)." "Issued May 7th 1877." "Expeditions of 1871 & 1786 under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army." "Weyss, Herman & Lang, del." "By...
1877-05-07
1881-06-30 |
|
At bottom of map: 'Base compiled from plane-table sheets, topographic maps of U.S. Geological Survey, railroad alignments, and General Land Office data.' Relief shown by hachures and spot heights. Shows township and range grid. Covers from...
2024-05-05
2024-05-05 |
|
Reconnaissance map of eastern Nevada.
1869-05-05
|
|
Map showing the locations of springs, wells, and waterlines in Las Vegas in 1940.
1940-05-01
|
