| Intelligent Array System |
OCT 90 |
179 pages |
| Authors:
T. C. Bache; J. T. Anderson; D. Baumgardt; S. R. Bratt; W. E. Farrell; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
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 | This report presents a detailed description of the major product of this project, a computer hardware/software system called the Intelligent Array System (IAS). The IAS processes data from two high-frequency arrays (NORESS & ARCESS) in Norway to detect, locate and identify seismic events. The IAS computers and functions are distributed between the NORSAR Data Anlaysis Center (NDAC) near Oslo and the Center for Seismic Studies (Center) in Arlington, VA. The ... |
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| Shallow Sub-Bottom Reflectors in the Northeast Pacific: Distribution and Physical Properties |
14 APR 86 |
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| Authors:
W. E. Farrell; W. F. Monet; SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA
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 | This report discusses the affect the local geology and geophysics has on acoustic propagation in a region of the Northeast Pacific. Evidence for the existance of ash layers acting as significant acoustic reflectors is presented along with other physical property data (i.e., roughness spectrum and sediments thickness). Regional geology, deposition models and on-land analogs of similar depositional environments (presence of chert) are also presented. Keywords: Abyssal hill; Shallow sub-bottom reflectors; ... |
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| Automatic Seismic Discrimination System (ASDIS) |
OCT 1982 |
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| Authors:
W. E. Farrell; S-CUBED LA JOLLA CA
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| This report, contains most of the material usually found in a Computer Program Development Specification. It gives detailed requirements for a computer program which is to perform automatic seismic discrimination. The proposed computer program, an expansion of one currently in use at the Seismic Data Analysis Center, is logically divided into two parts. The first part makes measurements on seismograms (feature selection). The measured features include time domain amplitudes, frequency ... |
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| Surface Wave Path Corrections, Deterministic Discrimination and Body Wave Attenuation |
OCT 1982 |
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| Authors:
W. E. Farrell; J. L. Stevens; John M. Savino; B. Snkoller; L. B. Bache; S-CUBED LA JOLLA CA
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| Rayleigh waves from the Eastern Kazakh test site recorded at Seismic research Observatory receivers have been analysed for phase-velocity dispersion, group velocity dispersion and spectral amplitude. Linear inversion theory has been used to interpret these data as arising from waves propagating in plane- layered earth models. This yields the mean shear velocity and attenuation over each path as well as the moment of the source. Using the path models, synthetic ... |
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| Seismological Discrimination and Yield Determination Research |
JUN 1981 |
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| Authors:
T. C. Bache; T. G. Barker; N. Rimer; J. T. Cherry; W. E. Farrell; SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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| This report summarizes work conducted by Systems, Science and Software concerning the generation, propagation, detection and analysis of seismic waves by both nuclear explosions and earthquake sources. Specific topics covered included numerical simulation of the near field ground motion from earthquakes and explosions, automatic signal processing relating to the detection of seismic events and magnitude determination, a compilation of near source data and the synthesis of this data in terms ... |
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| Evaluation of the Mars Seismic Event Detector |
AUG 1980 |
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| Authors:
W. E. Farrell; J. Wang; R. C. Goff; C. B. Archambeau; SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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| The Systems, Science and Software (S(3)) Multiple Arrival Recognition System (MARS) was run on two detection test tapes supplied by the VELA seismological Center (VSC). The tapes contain nearly 45 hours of phase- randomized seismic noise in which a total of 268 events were added at varying signal levels. Compared against an algorithm using 'optimum filters' which was run at the VELA Seismic Center, the MARS detector achieved a 13 ... |
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| Block Motion Estimates from Seismological Observations of MIGHTY EPIC and DIABLO HAWK. |
01 JUL 1979 |
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| Authors:
T. C. Bache; W. E. Farrell; D. G. Lambert; SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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| Seismological observations of the underground explosions MIGHTY EPIC and DIABLO HAWK were used to infer the extent of the block motions associated with these events. The data were three-component velocity recordings from the nine station seismic network operated by Lawrence Livermore Laboratory (LLL) and Sandia Laboratories at ranges from 131 to 368 km. Five additional stations were fielded by Systems, Science and Software (S3) for DIABLO HAWK. The two events ... |
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| Seismic System Calibration: 1. Parametric Models |
FEB 1979 |
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| Authors:
W. E. Farrell; J. Berger; SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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| We describe linear models of the IDA (International Deployment of Accelerometers) and SRO (Seismic Research Observatories) feedback seismometers obtained by straightforward analysis of the control systems. The most important property of these models is the theoretical transfer function they yield, relating Earth acceleration to output voltage. The parameterization of the theoretical transfer function is described. Several uses of the system models and transfer function are discussed, but we conclude that ... |
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| Distribution and Statistical Analysis of Sea-Floor Relief in the Northeast Pacific, |
DEC 1965 |
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| Authors:
S. M. Smith; T. E. Chase; W. E. Farrell; I. L. Taylor; M. E. Weed; WESTERN ELECTRIC CO INC NEW YORK
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| Krause and Menard recently reported on an analysis of North Pacific seafloor topography which was made by visually selecting and measuring parameters of individual hills along profiles 60 miles in length. One of the major objectives of this project has been the attempt to find similar parameters to describe the topography that can be obtained without scanning the echograms for specific features. Because this was a pilot project with time ... |
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