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1

Digitale Medien

Relation between the field of surface heat flow and the distribution ofP n -wave velocities for continents (1988)

Kubík, Jaroslav ; Janáčková, A. ; Červený, V.

Springer

Studia geophysica et geodaetica 32 (1988), S. 287-299

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ISSN: 1573-1626

Quelle: Springer Online Journal Archives 1860-2000

Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie , Physik

Beschreibung / Inhaltsverzeichnis: Summary The dependence between Pn-wave velocities and the surface heat flow, temperature at the core-mantl boundary and thickness of the Earth's crust for continents (Europe, Asia, North America and Australia) was investigated statistically in connection with the problem of lateral inhomogeneities in the upper mantle. The relations obtained were compared with those determined under laboratory conditions. The conclusion is that temperature and pressure effects may provide additional explanations of the regional variations of Pn-wave velocities observed in most continents.

Notizen: Резюме Зaвuсuмосmь меж¶rt;угрaнuчнымu скоросmямu nро¶rt;ольных волн нa nоверхносmu Мохоровuчuчa(Pn ), nоверхносmным mеnловым nоmоком, mемnерamуроŭ нa Мохо u мощносmью земноŭ коры конmuненmов былa uссле¶rt;овaнa в связu с воnросом о нрuчuнегорuзонmaльных нео¶rt;норо¶rt;носmеŭ скоросmu Pn. Оnублuковaнные ¶rt;aнные о резульmamaх лaборamорных uссле¶rt;овaнuŭ уnругuх своŭсmв nоро¶rt; верхнеŭ мaнmuu в условuях высокuх ¶rt;aвленuŭ u mемnерamур нaхо¶rt;umся в сооmвеmсmвuu с резульmamaмu nре¶rt;лaгaемоŭ рaбоmы. Делaеmся выво¶rt;, чmо регuонaльные uзмененuя скоросmеŭ Pn-волн ¶rt;ля больщеŭ чaсmu конmuненmaльноŭ коры оnре¶rt;еляюmся рaзлuчuем mермо¶rt;uнaмuческuх условuŭ нa nоверхносmu Мохоmовuчuчa.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01637886

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2

Digitale Medien

Approximative ray tracing and the accuracy of earthquake localization in media approximated by block structures (1989)

Šílený, Jan ; Janský, Jaromír ; Červený, V.

Springer

Studia geophysica et geodaetica 33 (1989), S. 164-176

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ISSN: 1573-1626

Quelle: Springer Online Journal Archives 1860-2000

Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie , Physik

Beschreibung / Inhaltsverzeichnis: Summary Localization errors made by approximating a given medium by a homogeneous rectangular block model and due to the approximative solution of two-point ray tracing are estimated for four different structures. The separate influence of the individual characteristics of the medium is discussed. The iterative Geiger method supplemented by a generalized inversion of the damped least-squares and Marquardt algorithm is used for localizating five hypothetical hypocentres using 9 stations. Travel times in the original structures, used as input data for localization, are calculated using a special ray tracing system.

Notizen: Резюме В рaбоmе оценены ошuбкu локaлuзaцuu вызвaнные annроксuмaцuеŭ реaльноŭ сре¶rt;ы мо¶rt;елеŭ сосmaвленноŭ uз орmогонaлных о¶rt;норо¶rt;ных блоков u annроксuмaцuеŭ mочного лучa ¶rt;вумя munaмu nрuблuзumельных лучеŭ.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01646582

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3

Digitale Medien

Computation of synthetic seismograms in 2-D and 3-D media using the Gaussian beam method (1989)

Musil, Miloslav ; Červený, V.

Springer

Studia geophysica et geodaetica 33 (1989), S. 213-229

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ISSN: 1573-1626

Quelle: Springer Online Journal Archives 1860-2000

Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie , Physik

Beschreibung / Inhaltsverzeichnis: Summary The Gaussian beam method is applied to vertical seismic profiling in 2-D and 3-D models. A simple approach to the computation of Gaussian beam seismograms in the vicinity of structural interfaces is proposed. The effects of (a) the radiation pattern of a point source, (b) noncausal attenuation, (c) transverse inhomogeneities in synthetic seismograms are studied on numerical examples.

Notizen: Резюме Меmо¶rt; Гaуссевых nучков uсnользуеmся ¶rt;ля верmuкaльно о сеŭсмuческо о nрофuлuровaнuя в ¶rt;вух u mрехмерных мо¶rt;елях сре¶rt;ы. Уnоmребляеmся несложныŭ nо¶rt;хо¶rt; к рaсчеmу сеŭсмо рaмм в окресmносmu сmрукmурно о рaз¶rt;елa. Нa nрuмерaх сuнmеmuческuх сеŭсмо рaмм uзучaюmся эффекmы (a) uзлученuя mочечно о uсmочнuкa, (б) неnрuчнно о nо лощенuя u (в) nоnеречных нео¶rt;норо¶rt;носmеŭ.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01633525

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4

Digitale Medien

Predictive spectral analysis of short records using maximum entropy (1985)

Konopásková, Jana ; Červený, V.

Springer

Studia geophysica et geodaetica 29 (1985), S. 228-237

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ISSN: 1573-1626

Quelle: Springer Online Journal Archives 1860-2000

Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie , Physik

Beschreibung / Inhaltsverzeichnis: Summary A method of spectral analysis based on the prediction of the signal by means of AR parameters is proposed. The essence of this method ranks it between the classical methods of spectral analysis and the method of maximum entropy. For sufficiently high SNR its resolution is higher than that of the classical methods. The new method enables power and phase spectra of the signal to be determined, and provides a better determination of the power spectrum amplitude. than the method of maximum entropy. A regularization procedure is presented which abolished the instability of the prediction filter, obtained by the least-squares method.

Notizen: Резюме Пре¶rt;ложен сnособ сnекmрaльного aнaлuзa, основaнняыŭ нa nре¶rt;скaзaнuu сuгнaлa с nомощью aвmорегрессuонных naрaмеmров. Эmоm сnособ являеmся ¶rt;aльнеŭшuм рaзвumuем клaссuческuх мзmо¶rt;ов сnекmрaльного aнaлuзa с nрuвлеченuем u¶rt;еŭ uз меmо¶rt;a мaксuмaльноŭ энmроnuu. Сnособ облa¶rt;aеm nовышенноŭ рaэрешaющеŭ сnособносmью nо срaвненuю с клaссuческuмu меmо¶rt;aмu nрu aнaлuэе nроцессов с ¶rt;осmamочно хорошuм оmношенuем сuгнaл шум. Сnекmр мощносmu сuгнaлов оnре¶rt;еляеmср более нa¶rt;ежно, чем в меmо¶rt;е мaксuмaльноŭ энmроnuu. Воmлuчuе оm меmо¶rt;a мaксuмaльноŭ энmроnuu nре¶rt;ложенныŭ сnособ сnекmрaльного aнaлuзa nозволяеm оnре¶rt;еляmь mоже фaзовыŭ сnекmр сuгнaлов. Пaрaмеmры nре¶rt;скaзывaющего фuльmрa вычuсляюmся меmо¶rt;ом нauменьшuх квa¶rt;рamов, в коmором uсnользовaнa регулярuзaцuя ¶rt;ля вы¶rt;еленuя усmоŭчuвых облaсmеŭ решенuя.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01638434

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5

Digitale Medien

Iterative geophysical tomography (1986)

Jech, Jiří ; Červený, V.

Springer

Studia geophysica et geodaetica 30 (1986), S. 242-256

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ISSN: 1573-1626

Quelle: Springer Online Journal Archives 1860-2000

Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie , Physik

Beschreibung / Inhaltsverzeichnis: Summary The algorithm of iterative geophysical tomography is presented. The medium is approximated smoothly by means of B-splines. The tww-point problem of ray computation is solved with the aid of paraxial approximation. The parameters of the medium are obtained from the iterative algorithm of minimizing the quadratic form. Two numerical 2-D examples are given.

Notizen: Резюме Прuве¶rt;еи aлгорuфм umерamuвноŭгеофuзuческоŭ mомогрaфuu. Сре¶rt;a annроксuмuровaнa сnлощно nрu nомощu Б-сnлaŭнов. Пвухmочнaя nроблеммa рaсчемa лучеŭ рещенa nрu nомощu naрaксuaлноŭ annроксuмaцuu. Пaрaмеmры сре¶rt;ы nолучены иa основе umерamuвного aлгорuфмa мuнuмaлuзaцuu квa¶rt;рamuческоŭ формы. В рaбоmе nрuве¶rt;ены ¶rt;вa 2-D чuсленных nрuмерa.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01645465

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