Some results of the experimental study of seismic anisotropy of sedimentary rocks using different types of waves

Brodov, L. Y.; Evstifeyev, V. I.; Karus, E. V.; Kulichikhina, T. N.

doi:10.1111/j.1365-246x.1984.tb05035.x

Cited by 17 publications

(8 citation statements)

References 2 publications

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“…It can be caused by layering as well as by intrinsic, microscopic properties of the rocks. Investigation on sediments have shown that large anisotropy effects are caused by clay (Brodov et al 1984;Galperina & Galperin 1987). The percentage of clay in a sediment is correlated with the anisotropic property of the sediment, which can hence serve as a lithology indicator (Winterstein 1986).…”

Section: Introductionmentioning

confidence: 99%

Wave Propagation In A Vertical Transversely Isotropic Medium: Field Experiment and Model Study

Kerner

Dyer

Worthington

1989

Geophysical Journal International

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A down-hole experiment was carried out in the transversely isotropic Oxford Clay outcropping in the south of England. Different moveout curves for the two shear wave types and anomalous amplitude features for the SV-wave were found in the field data. Based on velocity measurements carried out formerly at the site a model study was performed to explain the results. Phase velocity and group velocity curves computed analytically with the method of characteristics, and synthetic seismograms computed with the AlekseevMikhailenko method, are presented. The field experiment and the model studies demonstrate that the occurrence of cuspidal triangles in the qSV-wavefront is an essential feature of wave propagation in transversely isotropic media. Even for weak transversely isotropic media there is a focusing effect into the direction of the cusp which leads to prominent shear wave amplitudes in this direction. Furthermore, we examined the effect of numerical anisotropy which can contaminate the synthetic seismograms. Velocity errors are one order of magnitude higher for shear waves than for compressional waves and increase with increasing Poisson's ratio. It was found that the error can be restricted to less than 1 percent only if using a spatial sampling of three times higher than a value that would generally be regarded as sufficient in finite difference computations.

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Section: Introductionmentioning

confidence: 99%

Wave Propagation In A Vertical Transversely Isotropic Medium: Field Experiment and Model Study

Kerner

Dyer

Worthington

1989

Geophysical Journal International

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“…Ó ö³é ñòàòò³ çðîáëåíî ñïðîáó âèçíà÷èòè ïîâ-íèé íàá³ð êîìïîíåíò ìàòðèö³ òåíçîðà ïðóaeíèõ ñòàëèõ ó íàáëèaeåíí³ òðèêë³ííî¿ ñèìåòð³¿ òà îö³-íèòè õàðàêòåð àçèìóòàëüíî¿ àí³çîòðîï³¿ ñåéñ-ì³÷íèõ õâèëü çà ðåçóëüòàòàìè ïîëüîâèõ ñåéñ-ì³÷íèõ äîñë³äaeåíü Brodov et al, 1984]. Ïðóaeí³ ñòàë³ âèçíà÷àþòü çà ³íâåð-ñ³ºþ ³íäèêàòðèñ ïðîìåíåâèõ àáî ôàçîâèõ øâèä-êîñòåé ð³çíî¿ ïîëÿðèçàö³¿, ãðóïó ñèìåòð³¿ îñà-äîâî¿ òîâù³ çà äîïîìîãîþ àêóñòè÷íîãî òåí-çîðà ³ òåíçîðà ïðóaeíèõ ñòàëèõ.…”

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“…Äëÿ âèçíà÷åííÿ ïîâíîãî íàáîðó êîìïîíåíò òåíçîðíî¿ ìàòðèö³ ïðóaeíèõ ñòàëèõ îñàäîâèõ â³äêëàä³â ó òðèêë³í-íîìó íàáëèaeåíí³ áóëè âèêîðèñòàí³ ðåçóëüòàòè ïîëüîâèõ ñïîñòåðåaeåíü ìåòîäîì ÂÑÏ, ÿê³ ïðî-âåäåíî â ðàéîí³ Ï³âäåííî¿ Åëüáè (Ïðèêàñï³é-ñüêà çàïàäèíà) [Brodov et al, 1984]. Îñàäîâ³ â³ä-êëàäè, ÿê³ áóëè îáºêòîì äîñë³äaeåíü, ñêëàäàþòü âåðõè íèaeíüî¿ êðåéäè.…”

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“…Îñàäîâ³ â³ä-êëàäè, ÿê³ áóëè îáºêòîì äîñë³äaeåíü, ñêëàäàþòü âåðõè íèaeíüî¿ êðåéäè. Ìåòîäèêà åêñïåðèìåí-òàëüíèõ ñåéñì³÷íèõ äîñë³äaeåíü ïîëÿãàëà ó ïî-ºäíàíí³ ñïîñòåðåaeåíü â³äáèòèõ ³ çàëîìëåíèõ õâèëü íà ïîâåðõí³ ç³ ñïîñòåðåaeåííÿìè ïðÿìèõ õâèëü ó ñâåðäëîâèíàõ Brodov et al, 1984]. Ïîëüîâ³ åêñïåðèìåíòè âèêîíóâàëè çà çáóðåí-íÿ ïîçäîâaeí³õ ³ ïîïåðå÷íèõ õâèëü ç ð³çíîþ ïî-ëÿðèçàö³ºþ.…”

mentioning

confidence: 99%

“…Íà äóìêó àâòîð³â ñòàòò³ [Brodov et al, 1984], ³íäèêàòðèñè SH-³ SV-õâèëü (ðèñ. 1, à) çà ôîð-ìîþ äóaeå áëèçüê³ äî òåîðåòè÷íèõ êðèâèõ äëÿ ìîäåë³ ïîïåðå÷íî-³çîòðîïíî¿ ñèìåòð³¿.…”

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