Publications
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Contaminant transport in Massachusetts Bay
Construction of a new treatment plant and outfall to clean up Boston Harbor is currently one of the world's largest public works projects, costing about $4 billion. There is concern about the long-term impact of contaminants on Massachusetts Bay and adjacent Gulf of Maine because these areas are used extensively for transportation, recreation, fishing, and tourism, as well as waste disposal. Publi
Authors
Bradford Butman
Seismic noise on Rarotonga: Surface versus downhole
Seismic noise data are presented from the new Global Seismographic Network station, RAR, on the Island of Rarotonga in the South Pacific. Data from the first new borehole site in the GSN are compared with a surface vault installation. Initial indications from the data show that borehole siting on a small island significantly reduces long-period (>20 s) horizontal seismic noise levels during the da
Authors
Rhett Butler, C. R. Hutt
Strain accumulation across the Wasatch Fault near Ogden, Utah
Deformation of a 70 by 40‐km trilateration network spanning the north trending Wasatch fault near Ogden, Utah, has been monitored from 1972 through 1990. All but nine of the 200 measurements are consistent with deformation that is linear in time. We presume that those nine observations are contaminated by some blunder in making the measurements and that deformation is linear in time. The strain ra
Authors
James C. Savage, Michael Lisowski, W. H. Prescott
Interseismic deformation at the Nankai Trough, Japan, subduction zone
Uplift along the coast of southwestern Japan following the 1944 Tonankai (Ms = 8.0) and 1946 Nankaido (Ms = 8.2) earthquakes has been inferred from the 1950–1985 tide gage records. Although uplift rates vary with geographic position, the temporal dependence at each site can be described as the superposition of an exponentially decaying (time constant ∼5 years) transient, significant only in the fi
Authors
James C. Savage, Wayne R. Thatcher
Coulomb plasticity within the fault zone
We represent a well‐developed fault by a layer of granular material (fault gouge) confined between two competent fault blocks. Slip on such a fault involves plastic shearing of the fault gouge. That is, the fault gouge behaves as a Coulomb material, and the plastic flow is accomplished by slip on the two sets of Coulomb shears appropriate to the stress state and the frictional properties of the go
Authors
J. D. Byerlee, James C. Savage
Enhanced visualization for the interpretation of Magellan radar data: Supplement to the Magellan special issue
The differences of radar data from more familiar photographic images, coupled with the unique geologic characteristics of Venus's surface, can make interpretation of the standard Magellan data products difficult for both planetary scientists and nonspecialists. We describe a set of digital processing techniques for transforming individual remote‐sensing datasets in order to make the information th
Authors
Randolph L. Kirk, Laurence A. Soderblom, Ella M. Lee
The geology and distribution of impact craters on Venus: What are they telling us?
Magellan has revealed an ensemble of impact craters on Venus that is unique in many important ways. We have compiled a data base describing the 842 craters on 89% of Venus' surface mapped through orbit 2578. (The craters range in diameter from 1.5 to 280 km.) We have studied the distribution, size‐density, morphology, geology, and associated surface properties of these craters both in the aggregat
Authors
G. G. Schaber, R.G. Strom, H. J. Moore, Laurence A. Soderblom, Randolph L. Kirk, D.J. Chadwick, D.D. Dawson, Lisa R. Gaddis, J. M. Boyce, Joel F. Russell
Kenya Rift International Seismic Project, 1989–1990 experiment
Ever since Gregory's work at the turn of the century, the extensional structures extending through central Kenya have been recognized as the classic example of a continental rift zone. Because of the scale and variety of rift features present, this locality has fascinated geologists and geophysicists since its discovery.
Authors
G. Randy Keller, L.W. Braile, P.M. Davis, R.P. Meyer, Walter D. Mooney
Landslides triggered by Hurricane Hugo in eastern Puerto Rico, September 1989
On the morning of September 18, 1989, a category-four hurricane struck eastern Puerto Rico with a sustained wind speed in excess of 46 m/s. The 24-h rainfall accumulation from the hurricane ranged from 100 to 339 mm. Average rainfall intensities ranging from 34 to 39 mm/h were calculated for 4 and 6 h periods, respectively, at a rain gage equipped with satellite telemetry, and at an observer stati
Authors
Matthew C. Larsen, Angel J. Torres-Sanchez
Deep seismic sounding in northern Eurasia
For nearly 40 years, the former Soviet Union has carried out an extensive program of seismic studies of the Earth's crust and upper mantle, known as “Deep Seismic Sounding” or DSS [Piwinskii, 1979; Zverev and Kosminskaya, 1980; Egorkin and Pavlenkova, 1981; Egorkin and Chernyshov, 1983; Scheimer and Borg, 1985]. Beginning in 1939–1940 with a series of small-scale seismic experiments near Moscow, D
Authors
H. M. Benz, J. D. Unger, W.S. Leith, Walter D. Mooney, L. Solodilov, A.V. Egorkin, V.Z. Ryaboy
Comment and reply on "Archean and Proterozoic crustal evolution: Evidence from crustal seismology"
No abstract available.
Authors
T.F. Wever, R. Durrheim, Walter D. Mooney