| VELA Network Evaluation and Automatic Processing Research. |
22 NOV 1978 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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 | The second part of the work performed covered as follows: Evaluated SRO and ASRO stations by expanding the data base of operational stations to include at least one calendar year of data to determine the detection and discrimination capability of the stations, and to determine the performance characteristics of the detector used at the stations. Performed research on signal detection by investigating techniques to reduce the false alarms of detectors ... |
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| Relationships Between Noise and mb Bias Applied to Seismic Station Site Selection and Performance Evaluation. |
23 MAR 1978 |
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| Authors:
Donald L. Dietz; Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| An analysis of forty-six stations with known m sub b bias, noise amplitude, and tectonic structure showed that a relationship exists among these three parameters. A wide range of slopes in the relationship of noise magnitude and bias were examined. A slope of one applied to several normal groupings of noise levels provided a precise means of predicting the performance of seismic stations within large geographical areas. This interpretation resulted ... |
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| VELA Network Evaluation and Automatic Processing Research. |
03 JAN 1978 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| Work in the following areas is summarized: (1)SRO Evaluation; (2)Detection, Waveform Extraction, and Magnitude Estimation; (3)Event Identification Study; (4)Surface Wave Study; and (5)Seismic Data Management. |
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| VELA Network Evaluation and Automatic Processing Research. |
01 JUL 1977 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| This report summarizes work in the following areas: (1) Evaluation of ILPA and SRO data; (2) Development of detection methods; (3) Methods of extracting long-period event waveforms; (4) Interactive seismic signal processing; and (5) Determining path corrections and extracting source parameters from long-period data. |
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| VELA Network Evaluation and Automatic Processing Research. |
04 APR 1977 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| This second quarterly report summarizes progress under the VELA Network and Automatic Processing research Program. Work in the following areas is summarized: (1) Evaluation of ILPA and SRO data; (2) Development of detection methods; (3) Methods of extracting long-period event waveforms; (4) Interactive seismic signal processing; (5) Determining path corrections and extracting source parameters from long-period data. |
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| VELA Network Evaluation and Automatic Processing Research. |
06 JAN 1977 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| This first quarterly report summarizes progress under the VELA Network and Automatic Processing Research Program. Work in the following areas is summarized: evaluation of ILPA and SRO data, development of detection methods, methods of extracting long-period event waveforms, interactive seismic signal processing, determining path corrections and extracting source, and parameters from long-period data. |
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| Design, Simulated Operation, and Evaluation of a Short-Period Seismic Discrimination Processor in the Context of a World-Wide Seismic Surveillance System. |
29 OCT 1976 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| A brief summary of a series of system studies describes the data flow, file structures, and data processing required to operate a world-wide seismic surveillance network. One of the design problems in developing a surveillance mode of operation is to provide the seismic analyst-computer interaction needed to efficiently perform discrimination processing to effectively classify events as earthquakes or explosions. Efficiency is required to keep up with the daily load of ... |
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| Application of P-Wave Spectral Measurements to Short-Period Discrimination. |
31 JUL 1975 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| A method was developed for computing the displacement spectrum of earthquake dislocations and presumed explosions with greater accuracy. Measurements of corner frequencies and displacement amplitudes are considerably less ambiguous than those derived from conventional spectra. The relatively narrowband system response is apparently correctly accounted for in the equations for ground displacement, so that the displacement spectra are in principal valid up to 10 Hz. Presently, roundoff errors compounded by estimation ... |
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| Feasibility of Interactive Data Processing in a Seismic Surveillance System. |
31 DEC 1974 |
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| Authors:
Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| An interactive data processing system enables a seismic data analyst to interrupt and modify the automatic processing of seismic data. It results in increased efficiency of retrieving desired seismic data. Also, it results in increased capability of the analyst to accurately describe and document seismic events. Principles are described to effectively design software for a seismic interactive data processing system. A set of tasks were described in detail as promising ... |
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| Simulation of a World-Wide Seismic Surveillance Network. |
31 DEC 1974 |
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| Authors:
Edward M. Shoup; Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| This study, conducted by Texas Instruments Incorporated, over the period 1 February 1974 to 31 December 1974, extends earlier studies concerning the design and evaluation of a global seismic surveillance system by providing a closer simulation of the physical network for testing alternatives, developing specifications and assessing capability. The simulator employs finite-difference models of major network elements such as communications and signal processing elements. Simulation results were obtained on reliability, ... |
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| Aspects of Information Feedback and Parameter Update Design for a Seismic Surveillance System. |
31 DEC 1974 |
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| Authors:
Rudolf Unger; Stephen S. Lane; Robert L. Sax; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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| An information feedback and parameter update design study is presented as an extension of an earlier study of a seismic surveillance system. Based on system concepts developed in the previous study, this report gives an overview of system interactions, and discusses the problems related to detection threshold control and the computation and application of beamforming and event classification parameter corrections. |
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Reports by Author
