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  • 1
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    Tectonic stress orientation and the seismic regime of a single fault (1988)
    In:  Tectonophys., Kunming, China, 4, vol. 152, no. 1, pp. 297-302, pp. 2353, (ISSN: 1340-4202)
    Details
    Publication Date: 1988
    Keywords: Stress ; Fault zone ; Spicak
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Statistical precursors of instability of loaded rock samples based on acoustic emission (1996)
    In:  International Journal of Rock Mechanics and Mining Sciences, Kobe, Dec. 6-11, 1993, The Local Organizing Committee for the CRCM '93, vol. 33, no. 7, pp. 743-748, pp. L14313, (ISSN: 1340-4202)
    Details
    Publication Date: 1996
    Keywords: Rock bursts (see also ERDSTOSS and GEBIRGSSCHLAG) ; Induced seismicity ; Acoustic emission ; Rock mechanics ; Seismology ; Stress
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    A first arrival identification system of acoustic emission (AE) signals by means of a high-order statistic approach (2006)
    In:  Measurement Science and Technology, pp. 2461-2466, vol. 17, no. 9
    Details
    Publication Date: 2006
    Keywords: TF III ; Task Force III ; Lithosphere-Astenosphere Interactions
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    BIBLIOGRAPHY ILP
  • 4
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    Fault interaction and seismicity: Laboratory investigation and its seismotectonic interpretation (1986)
    In:  Pageoph, Hannover, Polish Geothermal Association, vol. 124, no. 3, pp. 857-874, pp. 1051, (ISSN: 1340-4202)
    Details
    Publication Date: 1986
    Keywords: Seismicity ; Rock mechanics ; Laboratory measurements ; Fault plane solution, focal mechanism ; Fault zone ; Tectonics ; Lokajicek
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
    Electronic Resource
    Electronic Resource
    Influence of Nonlinear Processes in Seismic Foci on Released Energy (1997)
    Springer
    Pure and applied geophysics 149 (1997), S. 337-355 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Self-synchronisation, nonlinear effects, seismic energy release, rock bursts, amplitude- phase analysis, relative width of frequency spectra.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The results of the frequency analysis of seismoacoustic elastic waves radiated from the loaded rock sample source models and of rock bursts records are presented. For both categories of study the fundamental symptoms of nonlinear processes in seismic foci were found and demonstrated. Namely, the wave-field modulation (satellites in the spectra), forced synchronisation (spectra simplification and their transformation into a narrow spectral band), frequency shift to lower values and, finally, coherency of radiation. A new method of amplitude-phase distribution is worked out. All this indicates that nonlinear processes can participate in a seismic source during the energy release. Also, the disagreement between the source sizes observed in the nature and computed by means of linear physics, can be explained by self-organising processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050029
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  • 6
    Electronic Resource
    Electronic Resource
    Laboratory Approach to the Study of Elastic Anisotropy on Rock Samples (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 619-629 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Laboratory measurements, elastic anisotropy, kinematic and dynamic parameters of elastic waves, hydrostatic pressure.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The experimental approach (hardware and software) to the study of the elastic an isotropy of rocks on spherical samples under hydrostatic pressure up to 400 MPa is discussed. A substantial innovation of the existing measuring system and processing methods enabled us to make a detailed investigation and evaluation of the kinematic as well as dynamic parameters of elastic waves propagating through anisotropic media. The innovation is based on digital recording of the wave pattern with a high sampling density of both time and amplitude. Several options and results obtained with the innovated laboratory equipment are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050133
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  • 7
    Electronic Resource
    Electronic Resource
    Elastic Parameters of West Bohemian Granites under Hydrostatic Pressure (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 631-646 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Granite, Bohemian Massif, P-wave velocity, velocity anisotropy, fabric elements, hydrostatic pressure.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The West Bohemian seismoactive region is situated near the contact of the Moldanu bian, Bohemian and Saxothuringian units in which a large volume is occupied by granitoid massifs. The spatial distribution of P-wave velocities and the rock fabric of five representative samples from these massifs were studied. The P-wave velocities were measured on spherical samples in 132 independent directions under hydrostatic pressure up to 400 MPa, using the pulse-transmission method. The pressure of 400 MPa corresponds to a depth of about 15 km in the area under study. The changes of P-wave velocity were correlated with the preferred orientations of the main rock fabric elements, i.e., rock forming minerals and microcracks. The values of the P-wave velocity from laboratory measurements on granite samples fit the velocity model used by seismologists in the West Bohemian seismoactive region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050134
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  • 8
    Electronic Resource
    Electronic Resource
    Energy - Frequency Distribution of Acoustic Emission from Loaded Rock Samples (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 210-213 (May 1996), p. 541-548 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.210-213.541.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fault interaction and seismicity: Laboratory investigation and its seismotectonic interpretation (1986)
    Springer
    Pure and applied geophysics 124 (1986), S. 857-874 
    Details
    ISSN: 1420-9136
    Keywords: Fault interaction ; seismotectonic interpretation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Systems of two parallel linear faults of the same length with the angle of inclination α=45° were investigated under uniaxial linearly increasing load. Perspex plates were used as models. For each treated fault configuration the morphology of tensile cracks and the sequence of seismoacoustic events of shear and tensile origin were studied. It is shown that the seismic regime of a fault system is strongly influenced by the contact conditions on a fault plane; it is different in the faults with the aseismic contact, represented by open slits, and in the faults with the seismoactive contact, represented by filled slits, respectively. The experiments proved the dominating role of a fast shear displacement of the stick-slip type in the regime of seismic energy release of a fault system. The tensile crack generation seems to be only of little—if not negligible—importance. On the other hand, the existence of tensile cracks in a fault system can play an important role in the course of subsequent loading cycles because the stick-slip displacements can take place not only along the primary faults but also along the planes of tensile cracks. A comparison of some results of model experiments and the already published results of geological and seismological investigations indicated that the way of seismic energy relase on faults in nature and in the laboratory could be of the same character. Several analogies between the seismic regime of a fault model and of real seismic regions were found concerning the morphology of faults, off-fault fore- and aftershocks, and earthquake doublets, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879615
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  • 10
    Electronic Resource
    Electronic Resource
    Seismic regime of a single fault model (1986)
    Springer
    Pure and applied geophysics 124 (1986), S. 793-810 
    Details
    ISSN: 1420-9136
    Keywords: Plate models ; shear and tensile source mechanisms ; seismotectonic interpretation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A special experimental technique enabled us to study in detail seismic events on a fault model in a uniaxial stress field. The recording system used made it possible to investigate the radiation pattern for all the events observed including the precise determination of the dislocation origin. The aim of the present paper is (1) to find the relation between shear and tensile displacements, (2) to check a possible influence of the process of tensile crack generation on the seismic energy release and (3) to compare the seismic regime of a single fault before and after the tensile crack generation, respectively. Results prove the dominating importance of shear mechanism for the seismic energy release. The tensile displacement can be seismoactive only under special contact conditions on the fault plane. The existence of tensile cracks at the fault tips changed the pattern of seismic energy radiation. This feature is probably caused by subsequent changes in contact conditions on the fault plane and in the stress field around the fault. A comparison of some results of the present model experiments with the already published results of geological and seismological measurements and investigations shows the analogous character in laboratory and in nature of the process of tectonic earthquake preparation, the displacement course on the fault during the earthquake and the manner of seismic energy release on faults.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879611
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