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Digitale Medien

Migration of seismic data (1994)

Bonomi, Ernesto ; Cabitza, Gabriella

Springer

Journal of statistical physics 76 (1994), S. 703-723

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ISSN: 1572-9613

Schlagwort(e): Seismology ; migration ; scalar wave equation ; parallel computing

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Prospecting for oil and gas resources poses the problem of determining the geological structure of the earth's crust from indirect measurements. Seismic migration is an acoustic image reconstruction technique based on the inversion of the scalar wave equation. Extensive computation is necessary before reliable information can be extracted from large sets of recorded data. In this paper a collection of “industrial” migration techniques, each giving rise to a data parallel algorithm, is outlined. Computer simulations on synthetic seismic data illustrate the problem and the approach.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02188682

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2

Digitale Medien

Focus-of-attention techniques in the automatic interpretation of seismograms (1991)

Chiaruttini, Claudio

Springer

Pure and applied geophysics 135 (1991), S. 61-75

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ISSN: 1420-9136

Schlagwort(e): Seismology ; seismic networks ; artificial intelligence ; expert systems ; automatic interpretation ; seismic event detection ; data compression

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The focus-of-attention techniques implemented in SNA2, a knowledge-based system for seismogram interpretation, are presented. They consist of data compression of the input digital records, scanning of the compressed traces to detect candidate seismograms and extraction of seismogram features. A criterion is given to rate the clarity of seismograms; the clarity defines the order in which the system will consider them to build up the interpretation. The proposed techniques are simple and fast; they allow quick rejection of noise and focussing the attention of the system on the portions of traces containing relevant information.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00877009

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3

Digitale Medien

On intermediate-term earthquake prediction in central Italy (1990)

Keilis-borok, V. I. ; Kuznetsov, I. V. ; Panza, G. F. ; [weitere]

Springer

Pure and applied geophysics 134 (1990), S. 79-92

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ISSN: 1420-9136

Schlagwort(e): Seismology ; earthquake prediction ; self-similarity ; algorithm CN ; Central Italy

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract The Time of Increased Probability (TIP) for the occurrence of a strong earthquake is determined in Central Italy. This is done with an algorithm that has been successfully applied in other regions of the world (algorithm CN, from the initials of California and Nevada, where the first diagnoses of TIPs were made). The use of normalized functions allows direct application of the orginal algorithm to the new region being studied, without anyad hoc adjustment of the parameters. Retrospective analysis carried on until 1986 shows that TIPs occupy 26 percent of the total time considered and precede four out of five strong earthquakes. Forward monitoring indicates the possible existence of a TIP started in May 1988. Several tests indicate that the results obtained are quite stable, even when using catalogues from different agencies. Apart from obvious practical interest, this research is essential for the worldwide investigation of self-similarity in the origin of strong earthquakes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00878081

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4

Unbekannt

Encyclopedia of Solid Earth Geophysics (1990)

James, D. E., Ed.

Springer

In: Amsterdam, 394 pp., Springer, vol. 46, no. XVI:, pp. 1-14, (ISBN: 0-387-30752-4)

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Publikationsdatum: 1990

Beschreibung: Consisting of more than 150 articles written by leading experts, this authoritative reference encompasses the entire field of solid-earth geophysics. It describes in detail the state of current knowledge, including advanced instrumentation and techniques, and focuses on important areas of exploration geophysics. It also offers clear and complete coverage of seismology, geodesy, gravimetry, magnetotellurics and related areas in the adjacent disciplines of physics, geology, oceanography and space science.

Schlagwort(e): Textbook of geophysics ; Seismology ; Geodesy ; Gravimetry, Gravitation ; Electromagnetic methods/phenomena ; Applied geophysics ; PlanetologyT

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BIBLIOGRAFIE SEISMOLOGIE