Publications
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Data report for the TACT 1987 seismic refraction survey: Fairbanks North and Olnes deployments
No abstract available.
Authors
Mark R. Goldman, G. S. Fuis, J. H. Luetgert, D.J. Geddes
Geology of the Gulf of the Farallones National Marine Sanctuary
No abstract available.
Authors
Herman A. Karl
Lava-flow characterization at Pisgah Volcanic Field, California, with multiparameter imaging radar
Multi-incidence-angle (in the 25° to 55° range) radar data acquired by the NASA/JPL Airborne Synthetic Aperture Radar (AIRSAR) at three wavelengths simultaneously and displayed at three polarizations are examined for their utility in characterizing lava flows at Pisgah volcanic field, California. Pisgah lava flows were erupted in three phases; flow textures consist of hummocky pahoehoe, smooth pah
Authors
Lisa R. Gaddis
40Ar/39Ar dating of the Jaramillo normal subchron and the Matuyama and Brunhes geomagnetic boundary
No abstract available.
Authors
G. A. Izett, J.D. Obradovich
The world landslide problem
Thousands of people may be killed by landslides each year and property damage may be in the tens of billions of dollars, but the techniques for recognizing and coping with landslides are well developed. Landslides are generally more manageable and predictable than earthquakes, volcanic eruptions, and some storms, but only a few countries have taken advantage of this knowledge to reduce landslide h
Authors
E. E. Brabb
Speculations on continental crustal evolution
The evolution of the continental crust is a topic that has challenged Earth scientists since the earliest hypotheses of crustal evolution were put forth by such luminaries as Hutton, the 18th century Scottish scientist, and later by Stille (Germany), Argand (France), and Dana (United States). Recent geophysical observations provide important constraints on hypotheses of crustal evolution, and the
Authors
R. Meissner, Walter D. Mooney
The velocity field along the San Andreas Fault in central and southern California
The velocity field within a 100‐km‐broad zone centered on the San Andreas fault between the Mexican border and San Francisco Bay has been inferred from repeated surveys of trilateration networks in the 1973–1989 interval. The velocity field has the appearance of a shear flow that remains parallel to the local strike of the fault even through such major deflections as the big bend of the San Andrea
Authors
Michael Lisowski, James C. Savage, W. H. Prescott
Strain accumulation in western Washington
The Juan de Fuca plate is subducted beneath the North American plate off the coast of Washington at a rate of about 40 mm/yr N68°E. The average principal strain rates (extension reckoned positive) measured in northwestern Washington are as follows: Olympic peninsula 25 km south of Port Angeles from 1982 through 1990, and and near Seattle from 1972 through 1985, and . Both strain measurements ar
Authors
James C. Savage, Michael Lisowski, W. H. Prescott
Tide gage measurements of uplift along the south coast of Alaska
Annual mean sea levels along the south coast of Alaska are used to measure uplift along the Alaska‐Aleutian subduction zone. Oceanographic effects are removed from the observed annual mean sea levels by subtracting a correction that is proportional to the sea level fluctuations observed in southeast Alaska. That correction is effective in reducing fluctuations in the observed, annual mean sea leve
Authors
James C. Savage, George Plafker
Criticism of some forecasts of the National Earthquake Prediction Evaluation Council
The Working Group on California Earthquake Probabilities has assigned probabilities for rupture in the interval from 1988 to 2018 to various segments of the San Andreas fault on the basis of the lognormal distribution of recurrence times of characteristic earthquakes postulated by Nishenko and Buland (1987). I question the validity of those probabilities on the basis of three separate arguments: (
Authors
James C. Savage
Continental crustal evolution observations
How has the continental crust evolved? What are the primary processes responsible for its composition, structure, and mode of deformation? What role do fluids play in deep crustal processes? In the last dozen years, geophysicists have obtained images of the deep continental crust that can be used to examine these questions and refine geologic models of crustal evolution. In this report we summariz
Authors
Walter D. Mooney, R. Meissner
Strain accumulation along the Denali Fault at the Nenana River and Delta River Crossings, Alaska
Surveys of trilateration networks across the Denali fault at the Nenana River in 1982, 1984, and 1988 and at the Delta River in 1975, 1979, 1982, and 1984 indicate a minor (0.10±0.04 μstrain/yr) northeastward uniaxial extension. The component of right‐lateral shear‐strain accumulation across the fault is not significant at the two‐standard‐deviation level. At the Delta River network the strain acc
Authors
James C. Savage, Michael Lisowski