Publications
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Crustal refraction profile of the Long Valley caldera, California, from the January 1983 Mammoth Lakes earthquake swarm Crustal refraction profile of the Long Valley caldera, California, from the January 1983 Mammoth Lakes earthquake swarm
Seismic-refraction profiles recorded north of Mammoth Lakes, California, using earthquake sources from the January 1983 swarm complement earlier explosion refraction profiles and provide velocity information from deeper in the crust in the area of the Long Valley caldera. Eight earthquakes from a depth range of 4.9 to 8.0 km confirm the observation of basement rocks with seismic...
Authors
James H. Luetgert, Walter D. Mooney
How the geomagnetic field vector reverses polarity How the geomagnetic field vector reverses polarity
A highly detailed record of both the direction and intensity of the Earth's magnetic field as it reverses has been obtained from a Miocene volcanic sequence. The transitional field is low in intensity and is typically non-axisymmetric. Geomagnetic impulses corresponding to astonishingly high rates of change of the field sometimes occur, suggesting that liquid velocity within the Earth's...
Authors
M. Prevot, E. A. Mankinen, C. S. Grommé, R. S. Coe
An assessment of the near-surface accuracy of the international geomagnetic reference field 1980 model of the main geomagnetic field An assessment of the near-surface accuracy of the international geomagnetic reference field 1980 model of the main geomagnetic field
The new International Geomagnetic Reference Field (IGRF) model of the main geomagnetic field for 1980 is based heavily on measurements from the MAGSAT satellite survey. Assessment of the accuracy of the new model, as a description of the main field near the Earth's surface, is important because the accuracy of models derived from satellite data can be adversely affected by the magnetic...
Authors
N.W. Peddie, A.K. Zunde
Why deposits of longitudinal dunes are rarely recognized in the geologic record Why deposits of longitudinal dunes are rarely recognized in the geologic record
Dunes that are morphologically of linear type, many of which are probably of longitudinal type in a morphodynamic sense, are common in modern deserts, but their deposits are rarely identified in aeolian sandstones. One reason for non-recognition of such dunes is that they can migrate laterally when they are not exactly parallel to the long-term sand-transport direction, thereby...
Authors
David M. Rubin, Ralph E. Hunter
Saudi Arabian seismic-refraction profile: A traveltime interpretation of crustal and upper mantle structure Saudi Arabian seismic-refraction profile: A traveltime interpretation of crustal and upper mantle structure
The crustal and upper mantle compressional-wave velocity structure across the southwestern Arabian Shield has been investigated by a 1000-km-long seismic refraction profile. The profile begins in Mesozoic cover rocks near Riyadh on the Arabian Platform, trends southwesterly across three major Precambrian tectonic provinces, traverses Cenozoic rocks of the coastal plain near Jizan, and...
Authors
Walter D. Mooney, M. E. Gettings, H. R. Blank, J. H. Healy
Feasibility of a nationwide program for the identification and delineation of hazards from mud flows and other landslides; Chapter A, Landslide classification for identification of mud flows and other landslides Feasibility of a nationwide program for the identification and delineation of hazards from mud flows and other landslides; Chapter A, Landslide classification for identification of mud flows and other landslides
No abstract available.
Authors
Russell H. Campbell, David J. Varnes, Robert W. Fleming, Monty A. Hampton, David B. Prior, Dwight A. Sangrey, Donald R. Nichols, Earl E. Brabb
Report on recommended list of structures for seismic instrumentation in San Bernardino County, California Report on recommended list of structures for seismic instrumentation in San Bernardino County, California
No abstract available.
Authors
G. Brady, Mehmet Çelebi, C. Rojahn, Wilfred Iwan, G. Hart, G. Pardoen, L. Schoelkopf, R. Haskell, K. Topping, Erdal Safak, R.P. Maley
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1985 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1985
No abstract available.
Authors
John B. Townshend, J.E. Papp, E.A. Sauter, L.Y. Torrence, P.A. Franklin
Steens Mountain geomagnetic polarity transition is a single phenomenon Steens Mountain geomagnetic polarity transition is a single phenomenon
[No abstract available]
Authors
C. S. Grommé, E. A. Mankinen, M. Prevot, R. S. Coe
A general earthquake-observation system (GEOS) A general earthquake-observation system (GEOS)
Microprocessor technology has permitted the development of a General Earthquake-Observation System (GEOS) useful for most seismic applications. Central-processing-unit control via robust software of system functions that are isolated on hardware modules permits field adaptability of the system to a wide variety of active and passive seismic experiments and straightforward modification...
Authors
R. D. Borcherdt, Joe B. Fletcher, E.G. Jensen, G.L. Maxwell, J.R. VanSchaack, R.E. Warrick, E. Cranswick, M.J.S. Johnston, R. McClearn
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, July 1985 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, July 1985
No abstract available.
Authors
John B. Townshend, J.E. Papp, E.A. Sauter, L.Y. Torrence, P.A. Franklin
A drowned Holocene barrier spit off Cape Ann, Massachusetts A drowned Holocene barrier spit off Cape Ann, Massachusetts
Seismic profiles and bathymetric contours reveal a drowned barrier spit on Jeffreys Ledge off Cape Ann, Massachusetts. Seaward-dipping internal reflectors indicate that a regressive barrier formed during the early Holocene low sea-level stillstand. Preservation of the barrier spit may have been favored by its large size (as much as 20 m thick), by an ample sediment supply from...
Authors
Robert N. Oldale