The earthquake sequence near Danville, California, 1970
W.H.K. Lee, M.S. Eaton, E. E. Brabb
1971, Bulletin of the Seismological Society of America (61) 1771-1794
Several thousand small earthquakes, with magnitudes ranging up to 4, occurred near Danville, California, during May, June, and July 1970. Seven temporary seismographs were installed near the epicentral region to augment an existing telemetered network within 1 day after the first felt earthquake. The dense concentration of 10 seismographs within...
Investigations at active volcanoes
Thomas L. Wright
1971, Eos, Transactions, American Geophysical Union (52) 57-62
The field of volcanology has expanded greatly in the years 1967–1970, and work on active volcanoes has kept pace with this expansion. I have restricted this summary and the accompanying bibliography to studies by U.S.‐based investigators of active or potentially active volcanoes. I have been immeasurably aided in writing this...
Origin of the differentiated and hybrid lavas of Kilauea Volcano, Hawaii
Thomas L. Wright, Richard S. Fiske
1971, Journal of Petrology (12) 1-65
Kilauea Volcano has erupted lava from its summit caldera and from two rift zones that extend from the summit towards the east and south-west. Lavas erupted from the summit of the volcano differ from each other principally in their content of olivine and define lines of ‘olivine control’ on magnesia...
Interpretation of an aeromagnetic strip across the northwestern United States
Isidore Zietz, B. Carter Hearn, Michael W. Higgins, G. D. Robinson, Donald A. Swanson
1971, Bulletin of the Geological Society of America (82) 3347-3372
This report discusses the results of aeromagnetic survey bounded by latitudes 45°30′ N. and 47°00′ N. and extending from the Rocky Mountains, to approximately 120 mi offshore in the Pacific Ocean. East of the Rocky Mountains, a larger area has been surveyed in the Great Plains bounded approximately by latitudes...
Small plate tectonics in the northeastern Pacific
Eli A. Silver
1971, Bulletin of the Geological Society of America (82) 3491-3496
Lithospheric plate motions in the northeastern Pacific were complicated at about 2.5 m.y. B.P. by the movement along a major northeast-trending fault cutting Cascadia Basin. An estimate of the slip rate along this fault gives critical information on the relative motions of four geometrically interdependent...
Upper Cenozoic basalts with high Sr87/Sr86 and Sr/Rb ratios, southern Great Basin, western United States
Carl E. Hedge, Donald C. Noble
1971, Bulletin of the Geological Society of America (82) 3503-3509
Upper Cenozoic basalts from southwestern Nevada and east-central California are unusually rich in both strontium (~ 1,200 ppm) and Sr87 (initial Sr87/Sr86 ~ 0.707). The average Rb/Sr ratio of these basalts is too low to have generated the observed Sr87/Sr86 ratio during the 4.6 b.y. of the Earth's...
Thin skin distension in Tertiary rocks of southeastern Nevada: Reply
R. Ernest Anderson
1971, Bulletin of the Geological Society of America (82) 3533-3536
No abstract available....
Status of engineering geologic and environmental geologic mapping in the United States
Dorothy H. Radbruch
1971, Bulletin of the International Association of Engineering Geology (4) 4-14
1. Engineering geologic maps in the United States may be one map prepared as part of a larger study of environmental geology, individual areal geologic maps containing additional engineering geologic data, or engineering geologic maps of single construction sites.2. No systematic methodology for engineering geologic or environmental geologic maps has...
Fur catch in the United States, 1970
U.S. Bureau of Sport Fisheries and Wildlife
1971, Wildlife Leaflet 499
No abstract available....
Thin skin distension in Tertiary rocks of southeastern Nevada: Discussion
George A. Thompson
1971, Bulletin of the Geological Society of America (82) 3529-3531
No abstract available....
Tertiary igneous chronology of the Great Basin of western United States — Implications for tectonic models
Edwin H. McKee
1971, Bulletin of the Geological Society of America (82) 3497-3501
The chronology of igneous activity in the Great Basin of western United States is used as a time framework for a simple plate model. This chronology suggests that a plate (Farallon plate) became underthrust to sufficient depth by the middle Tertiary to trigger the eruption...
The impact of the introduction of duck virus enteritis (duck plague) to the commercial duck industry and other waterfowl in the United States
John W. Walker, William D. Urban, H.E. Nadler, Louis N. Locke
1971, Conference Paper, XIV World's poultry congress
No abstract available....
Ground-water pumpage in parts of Merced, Madera, Fresno, Kings, and Tulare Counties, California, 1962-66
Hugh T. Mitten, William Ogilbee
1971, Report
Quantitative estimates of ground-water pumpage from the principal ground-water basins in California are necessary for future appraisal studies, for constructing hydrologic models, and for systematic planning of water use and conservation. Methods of estimating pumpage for this report are based on metered pumpages, on electric-power consumption and fuel consumption by...
Tectonics of the Mendocino triple junction
Eli A. Silver
1971, Bulletin of the Geological Society of America (82) 2965-2977
Interpretation of reflection profiles and of the magnetic anomaly pattern over the Gorda Basin and Escarpment gives broad agreement with the triple junction model of McKenzie and Morgan (1969). However, the basin has undergone internal deformation, a local departure from rigid plate tectonics, and the...
Age of the Mesozoic oceanic crust in the California Coast Ranges
Marvin A. Lanphere
1971, Bulletin of the Geological Society of America (82) 3209-3211
K-Ar ages of approximately 155 m.y. were measured on minerals from ophiolites at two localities in the California Coast Ranges. Upper Jurassic rocks of the Great Valley sequence are in depositional contact with underlying ophiolites, which are interpreted as Mesozoic oceanic crust that formed during...
Mobility of uranium and thorium in glassy and crystallized silicic volcanic rocks
J. N. Rosholt, Prijana, Donald C. Noble
1971, Economic Geology (66) 1061-1069
No abstract available....
Effects of karst features on circulation of water in carbonate rocks in coastal areas
V. T. Stringfield, H. E. LeGrand
1971, Journal of Hydrology (14) 139-157
The normal balance between fresh water in coastal aquifers and sea water applies also to carbonate-rock aquifers that have been karstified, but there are local modifications in the balance that need to be considered. Uneven distribution of permeability, expressed by a network of...
Mean annual precipitation and precipitation depth-duration-frequency data for the San Francisco Bay region, California
S. E. Rantz
1971, Basic Data Contribution 32
This report presents precipitation data for the San Francisco Bay region in a form suitable for use as criteria for both drainage design and the study of the stability of land slopes. The data presented include (1) an isohyetal map showing long-term mean annual precipitation and (2) a table of...
EROS — New observation vantage points and processes
Raymond W. Fary Jr.
1971, Conference Paper
The EROS Program objective is to utilize aircraft and spacecraft remote-sensing technology as complementary parts of integrated data collection, processing, and dissemination systems to support resources research and management functions of the Department of the Interior. The Program develops and coordinates research in the applications of new sensors for resources...
Third International Seminar for Hydrology Professors
Lynn M. Shown
1971, Eos Science News (52) 723-723
The Third International Seminar for Hydrology Professors was held at Purdue University in Lafayette, Indiana. There were 72 U.S. participants from 25 States and 19 participants from 15 other countries as follows: three from Canada; two each from Costa...
The problem of groundwater discharge into the seas
B.I. Kudelin, I.S. Zekster, A.V. Meskheteli, S.A. Brusilovsky, F.W. Trainer
1971, Eos, Transactions, American Geophysical Union (52) 717-722
Introductory Note: The dynamic equilibrium of the various factors involved in the world water balance or budget is the central scientific problem of the International Hydrological Decade. One of the potentially vital elements of the balance is groundwater discharge to the oceans. To paraphrase the authors of the following Russian...
Earth-science studies of a nuclear test area in the western Aleutian Islands: Supplementary hydrologic information: Discussion
W. C. Ballance, L. M. Gard
1971, Bulletin of the Geological Society of America (82) 2963-2963
No abstract available....
Age and chemistry of tertiary volcanic rocks in north-central Arizona and relation of the rocks to the Colorado Plateaus
Edwin H. McKee, Charles A. Anderson
1971, Geological Society of America Bulletin (82) 2767-2782
During late Miocene (14.8 m.y.) to early Pliocene (10.1 m.y.) time, local latite and widespread basaltic flows accumulated with associated continental sedimentary deposits in north-central Arizona. Some of these rocks were displaced and tilted by normal faults, and new drainage, now occupied in part by basalt flows of late Pliocene...
Metamorphism of Precambrian granitic xenoliths in a mica peridotite at Rose Dome, Woodson County, Kansas: Part 2, petrologic and mineralogic studies
Paul C. Franks, M. E. Bickford, Holly C. Wagner
1971, Bulletin of the Geological Society of America (82) 2869-2889
Field, drill-core, petrographic, and mineralogic studies show that the Precambrian granitic rocks exposed on Rose Dome, Woodson County, Kansas, were emplaced as inclusions of basement rock in a mica peridotite magma that intruded the Pennsylvanian section of Rose Dome during Late Cretaceous time. High temperatures of the alkaline ultramafic magma...
A method for discriminating between biogenic and chemical origins of the ore-stage pyrite in a roll-type uranium deposit
C. G. Warren
1971, Economic Geology (66) 919-928
Some roll-type uranium deposits are marginal to an altered tongue in sandstone beds that originally contained more-or-less uniformly distributed pyrite. Mineralizing solutions percolated through the sandstone, oxidized nearly all the pre-existing pyrite, and then redeposited part of the pyrite downstream in an embryonic ore zone....
