Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2494
Recent landslides in Alameda County, California (1940-71): An estimate of economic losses and correlations with slope, rainfall, and ancient landslide deposits Recent landslides in Alameda County, California (1940-71): An estimate of economic losses and correlations with slope, rainfall, and ancient landslide deposits
No abstract available.
Authors
Tor Helge Nilsen, Fred A. Taylor, Earl E. Brabb
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center
The area of influence of an exploratory hole The area of influence of an exploratory hole
A method is presented for calculating the area of influence of exploratory drill holes by using the size and shape of resource targets. The solution presented is for elliptical and circular targets, but the method is applicable to any shaped target. The degree to which points have been explored depends upon their distance away from a drill hole and the possible orientations of the target...
Authors
D.A. Singer, L. J. Drew
Area of influence of exploratory drill holes under conditions of errors of recognition Area of influence of exploratory drill holes under conditions of errors of recognition
No abstract available.
Authors
Donald A. Singer
Natural remanent magnetization, mag¬netic properties, and oxidation of titanomagnetite in basaltic rocks from DSDP Leg 34 Natural remanent magnetization, mag¬netic properties, and oxidation of titanomagnetite in basaltic rocks from DSDP Leg 34
We have made paleomagnetic measurements and investigated the magnetic mineralogy of 24 samples of basalt and diabase from Sites 319, 320, and 321 on the Nazca plate. Sample distributions, locations, and ages of overlying sediments are as follows: Site 319, Hole 319, lat 13°01.04'S, long 101°31.46'W, 2 samples, early Miocene (N8); Site 319, Hole 319A, (same coordinates and age), 12...
Authors
C. Sherman Gromme, Edward A. Mankinen
Effect of geologic structure and metamorphic fluids on seismic behavior of the San Andreas fault system in central and northern California Effect of geologic structure and metamorphic fluids on seismic behavior of the San Andreas fault system in central and northern California
No abstract available.
Authors
William P. Irwin, Ivan Barnes
Chino Valley formation (Cambrian?) in northwestern Arizona Chino Valley formation (Cambrian?) in northwestern Arizona
A thin persistent unit (maximum thickness 13 m) of probable Cambrian age in the Chino Valley region of northwestern Arizona consists of three laterally equivalent, mutually exclusive lithofacies. These are, from west to east, lithic sandstone, pebble to boulder conglomerate, and dolomite. The unit, named the Chino Valley Formation, is younger than middle Middle Cambrian and older than...
Authors
Richard Hereford
The Oligocene volcanic center at Eureka, Nevada The Oligocene volcanic center at Eureka, Nevada
A volcanic center covering an area of about 80 km2 near Eureka, Nev., and active in the early Oligocene, is characterized by rhyolitic, rhyodacitic. and andesitic pyroclastic rocks, lava flows, and shallow intrusive bodies. These rocks were emplaced as intertonguing and interpenetrative units during a 5-m.y. interval; most of the volcanism was in the last 3 million years of this period...
Authors
M.C. Blake, E.H. McKee, Richard F. Marvin, Miles L. Silberman, Thomas B. Nolan
Discussion on K-Ar relations of granodiorite emplacement and tungsten and gold mineralization near the Getchell Mine, Humboldt County, Nevada: A reply Discussion on K-Ar relations of granodiorite emplacement and tungsten and gold mineralization near the Getchell Mine, Humboldt County, Nevada: A reply
No abstract available.
Authors
B. R. Berger, M.L. Silberman, Randolph A. Koski
Preparation and use of isopleth maps of landslide deposits: Comment and reply: REPLY Preparation and use of isopleth maps of landslide deposits: Comment and reply: REPLY
No abstract available.
Authors
R. H. Wright, R. H. Campbell, T. H. Nilsen
Recurrent geothermally induced debris avalanches on Boulder Glacier, Mount Baker, Washington Recurrent geothermally induced debris avalanches on Boulder Glacier, Mount Baker, Washington
Avalanches of snow, firn and hydrothermally altered rock and mud have been released six times since 1958 from Sherman Peak, part of the crater rim south of the main summit of Mount Baker, Wash. The avalanches traveled nearly identical paths 2.0-2.6 km down Boulder Glacier on the east slope of the volcano. Debris from at least one past avalanche can be seen as a thin bed of acidic mud in...
Authors
David Frank, Austin Post, Jules D. Friedman
A review of recently active faults in Taiwan A review of recently active faults in Taiwan
Six faults associated with five large earthquakes produced surface displacements ranging from 1 to 3 m in the period 1906 through 1951. Four of the ruptures occurred in the western coastal plain and foothills, and two occurred in the Longitudinal Valley of eastern Taiwan. Maps are included showing the locations and dimensions of the displacements. The published geological literature...
Authors
Manuel G. Bonilla
Studies for seismic zonation of the San Francisco Bay region Studies for seismic zonation of the San Francisco Bay region
The analyses presented in the preceding six papers show that the geologic setting of the San Francisco Bay region has a dominant influence on potential earthquake hazards. The strong correlation between geologic conditions and the amount of earthquake damage in 1906 emphasizes the importance of this influence and demonstrates the need for seismic zonation. Seismic zonation can provide...
Authors
Roger D. Borcherdt