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Deep structure of the bohemian massif from phase velocities of Rayleigh and Love waves

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Былы uзмерены фaзовые скоросmu волн Релея u Лявa меж¶rt;у шuрокоnолоснымu сеŭсмuческuмu сmaнцuямu КНС (Кaшnерске Горы, Южнaя Чехuя) u КSР (Кшонгж, Нuжнaя Сuлезuя). Профuл КНС - КSР nрuблuзumельно сооmвеmсmвуеm меж¶rt;унaро¶rt;ному nрофuлью VII ГСЗ. Дaнные ¶rt;ля обоuх munов волн былы оm¶rt;ельно uнверmuровaны в мо¶rt;елu зaвuсuмосmu скоросmu nоnеречных волн оmглубuны. В кaчесmве сmaрmмо¶rt;елu былa uсnользовaнa мо¶rt;ель КНКS 82 Новоmного[1] ¶rt;ля nрофuля VII ГСЗ. Коровaя чaсmь мо¶rt;елu Новоmного срaвнuмa с обеuмu нaборaмu нaшuх ¶rt;aнных, о¶rt;нaко нaшu ¶rt;aнные ¶rt;ля волн Релея mребуюm более нuзкuх скоросmеŭ nоnеречных волн — в сре¶rt;нем нa 0,24 км/с в верных 180 кuломеmрaх мaнmuu. Сре¶rt;нaя рaзнuцa меж¶rt;у мо¶rt;елью Новоmного u нaшеŭ мо¶rt;елью ¶rt;ля волн Лявa в эmом ¶rt;uanaзонеглубuн не nре¶rt;сmaвляеm больше 0,06 км/с. Еслu нaшa u¶rt;енmuфuкaцuя нaблю¶rt;aемых волн Лявa кaк фун¶rt;aменmaльного мо¶rt;a являеmся nрaвuльноŭ, mо эmоm резульmam свu¶rt;umельсmвуеm о nрuсуmсвuu nолярuзaцuонноŭ aнuзоmроnuu в верхнеŭ мaнmuu.

Summary

Phase velocities of Rayleigh and Love waves have been measured between the broadband seismic stations KHC (Kašperské Hory, South Bohemia) and KSP (Książ, Lower Silesia), a profile that nearly coincides with the Interactional DSS Profile VII. The data for both wave types were separately inverted into models of shear-wave velocity versus depth. Novotný's model KHKS 82[1] for the DSS Profile VII was used as a start model. While the crustal section of Novotný's model is compatible with both of our data sets, our Rayleigh-wave data require smaller shear-wave velocities, on the average by 0.24 km/s, in the top 180 km of the mantle. The average difference between Novotný's model and our Love-wave model in that depth range is only 0.06 km/s. If our identification of the observed Love waves as the fundamental mode is correct, this result indicates the presence of polarization anisotropy in the uppermost mantle.

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Authors and Affiliations

  1. Institute of Geophysics, Swiss Federal Inst. of Technology, Zürch

    Erhard Wielandt & Andreas Sigg

  2. EHT Hönggerberg, P. O. B. 266, CH-8093, Zürich

    Erhard Wielandt & Andreas Sigg

  3. Geophysical Institute, Czechosl. Acad. Sci., Prague

    Axel Plešinger & Josef Horálek

Authors
  1. Erhard Wielandt
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  2. Andreas Sigg
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  3. Axel Plešinger
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  4. Josef Horálek
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Wielandt, E., Sigg, A., Plešinger, A. et al. Deep structure of the bohemian massif from phase velocities of Rayleigh and Love waves. Stud Geophys Geod 31, 1–7 (1987). https://doi.org/10.1007/BF01631100

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