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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Changes in the Seismicity and Focal Mechanism of Small Earthquakes Prior to an MS 6.7 Earthquake in the Central Aleutian Island Arc
On November 4 1977, a magnitude Ms 6.7 (mb 5.7) shallow-focus thrust earthquake occurred in the vicinity of the Adak seismographic network in the central Aleutian island arc. The earthquake and its aftershock sequence occurred in an area that had not experienced a similar sequence since at least 1964. About 13 1/2 months before the main shock, the rate of occurrence of very small magnitude earthqu
Authors
Serena Billington, E.R. Engdahl, Stephanie Price
The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado
No abstract available
Authors
T. J. Armbrustmacher
The Franciscan assemblage and related rocks in northern California: A reinterpretation
No abstract available.
Illustrated geomorphic classification of Icelandic volcanoes
In 1959, Sigurdur Thorarinsson published his first complete classification of the 13 principal types of basaltic volcanoes of Iceland (Figure 1). In 1968, Thorarinssonpublished a modification of his earlier classification scheme. Both landform classifications were based on the relationship of the type of eruptive products (lava, lava and tephra, or tephra), number of eruptions (one or more than on
Authors
Richard S. Williams, Elliot C. Morris
Survey for bright Mars-crossing asteroids
A new method of search for relatively bright Mars-crossing asteroids with the Palomar 46-cm Schmidt camera was initiated in 1980. Selected fields photographed with the 46-cm Schmidt were systematically reduced for all asteroids detected on the films. The 46-cm Schmidt fields have an effective diameter of 8 3/4 degrees. Kodak 11a-D film was exposed with a yellow plexiglass filter. The films were sc
Authors
Eugene Merle Shoemaker, Carolyn S. Shoemaker, E. F. Helin, S. J. Bus, R. F. Wolfe
Physical variables and the petroleum discovery process
No abstract available.
Authors
Emil D. Attanasi, L. J. Drew, David H. Root
A geochemical study of the Eyasi I skull; implications for the process of fossilization
No abstract available.
Authors
James L. Bischoff
Use of captive starlings to determine effects of pollutants on passerine reproduction
Three reproductive trials were conducted to develop techniques for propagation of captive starlings (Stumus vulgaris) which could determine the effects of environmental contaminants on passerine reproduction. Trials were conducted during the spring of 1979 in five adjacent 2.4 by 3 by 12-m outdoor wire pens containing four or ten pairs of starlings, a similar number of nest boxes, perches, water,
Authors
C. E. Grue, C.L. Christian
Geology and concepts of genesis of important types of uranium deposits
Uranium ore deposits occur in nearly every major rock type in the earth’s crust, and nearly all igneous, metamorphic, and sedimentary processes are capable of concentrating or dispersing uranium. However, only three types of deposits account for more than 70 percent of known Western World Reasonably Assured Resources (WWRAR): Precambrian quartz-pebble conglomerate type, Proterozoic unconformity ty
Authors
J. Thomas Nash, H.C. Granger, S.S. Adams
Cenozoic coccoliths from the Deep Sea Drilling Project
Coccoliths, as the dominant constituent of many Deep Sea Drilling Project cores, have provided the means of rapid and detailed biostratigraphic zonation to help guide ocean-sediment coring operations aboard D.V. Glomar Challenger. The Cenozoic has been divided into 50 to 60 zones and subzones which are most effective for middle- and low- latitude sites. Because key stratigraphic coccoliths have pr
Authors
David Bukry
Synthesis of silicoflagellate stratigraphy for maestrichtian to quaternary marine sediment
Cosmopolitan and low-latitude silicoflagellate distributions determined from Deep Sea Drilling Project cores are synthesized into a sequence of 23 biostratigraphic zones and subzones for tropical and subtropical ocean areas. The stratigraphic relation of major morphologic changes in silicoflagellates from all areas is summarized. Two new Neogene subzones, one new Paleogene subzone, one new species
Authors
David Bukry