Publications
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Coastal processes and morphology of the Bering Sea coast of Alaska
No abstract available.
Authors
A. H. Sallenger, J. R. Dingler, R. E. Hunter
Age of graben systems on the moon
The study focuses on the time of formation of the graben. An attempt is made to determine whether the graben are restricted to geologic units of certain ages, and whether and at what time graben formation ceased. It is shown that (1) most preserved graben formed considerably later than the impacts that formed the basins; (2) graben are faults that are reactivated along older basin concentric and r
Authors
Baerbel K. Lucchitta, Jessica A. Watkins
Geomagnetic paleointensities from radiocarbon‐dated lava flows on Hawaii and the question of the Pacific nondipole low
Radiocarbon ages have been published for nine basaltic lava flows on the island of Hawaii; the ages range from 2600 to somewhat older than 17,900 years B.P. By using the Thelliers' method in vacuum, geomagnetic paleointensity values were obtained from eight of the lavas; the ninth proved unsuitable. The paleointensities for the four youngest flows (2600–4600 years B.P.) yield virtual dipole moment
Authors
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California
Paleomagnetic studies show that a normal polarity event within the Matuyama reversed polarity epoch is recorded by one of the volcanic units on Cobb Mountain in northern California. K-Ar age determinations show that this event has an age of 1.12 ± 0.02 m.y. and clearly preceded the Jaramillo normal polarity event. These data provide the first confirmation from a subaerial volcano that a brief pola
Authors
Edward A. Mankinen, J.M. Donnelly, C. S. Grommé
Morphology of chasma walls, Mars
The landforms developed on the walls of the Valles Marineris system of chasmas are of three major types, which are locally transitional. The most common type is composed of steep spurs and gullies. The dominant process in the formation or modification of this type appears to be the downslope movement of. material under the influence of gravity, resulting in the accumulation of extensive talus depo
Authors
Baerbel K. Lucchitta
Preliminary catalog of earthquakes in northern Imperial Valley, California, January 1, 1977 to March 31, 1977
The northern section of the Imperial Valley region in Southern California is an area of known geothermal resources and an area of high seismicity. To study in detail the relationship between geothermal areas and earthquakes, the U.S. Geological Survey has been monitoring seismicity in the Imperial Valley with a sixteen station network since 1973. Six new stations were added to the network in Novem
Authors
Madeline Schnapp, Gary S. Fuis
Playback Station #2 for Cal Net and 5-day-recorder tapes
A second system (Playback Station #2) has been set up to play back Cal Net 1" tapes and 5-day-recorder 1/2" tapes. As with the first playback system (Playback Station #1) the tapes are played back on a Bell and Howell VR3700B tape deck and the records are written out on a 16-channel direct-writing Siemens "0scillomink." Separate reproduce heads, tape guides, and tape tension sensor rollers are req
Authors
Jerry P. Eaton
Proceedings of Conference IV: the use of volunteers in the Earthquake Hazards Reduction Program, convened under the auspices of National Earthquake Hazards Reduction Program, 2-3 February, 1978, Menlo Park, California
There are tens of thousands of people in the United States who could
play an important voluntary role in reducing earthquake hazards and are
probably willing to do so. Under the Earthquake Hazard Reduction Act of
1977 the Federal government is significantly increasing its effort "to
reduce the risk of life and property from future earthquakes in the
United States through the establishment and main
Five-day recorder seismic system
The 10-day recorder seismic system used by the USGS since 1965 has been modified substantially to improve its dynamic range and frequency response, to decrease its power consumption and physical complexity, and to make its recordings more compatible with other NCER systems to facilitate data processing. The principal changes include:
1. increasing tape speed from 15/160 ips to 15/80 ips (red
Authors
Ed Criley, Jerry P. Eaton, Jim Ellis
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: December 1978
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory; therefore it should be regarded as preliminary.
Authors
J.B. Townshend, J.E. Papp, S.P. Tilton
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: November 1978
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory; therefore it should be regarded as preliminary.
Authors
J.B. Townshend, J.E. Papp, S.P. Tilton
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: October 1978
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory; therefore it should be regarded as preliminary.
Authors
J.B. Townshend, J.E. Papp, S.P. Tilton