View More View Less
  • 1 MTA-ELTE Geophysics and Environmental Physics Research Group, Eötvös Loránd University Department of Geophysics Pázmány P. sétány 1/C H-1083 Budapest
Restricted access

It is well known that surface geology may significantly affect strong ground motion and hence it should be incorporated into seismic hazard estimation at a specific site. Numerical and empirical methods are used to determine the site effect. On areas with moderate seismicity the empirical methods are based on microtremor measurements. Solely the single station methods, for example the H/V spectral ratio technique, could be used in the absence of a nearby reference station situated on rock site. The one year long noise measurements of 8 stations belonging to the Hungarian Microseismic Monitoring Network have made it possible the testing of this method. The stations are situated in the middle part of Hungary. All seismometers are triaxial LE-3D high sensitivity 1 Hz geophones. Three stations are situated on hard rocks while five ones on loose site above a deep sedimentary basin with more than 1000m thick sediments. The large amount of noise data have made it possible to examine the stability of the method. The examinations have shown that the computed spectral ratio curves are very stable in time. While all stations on rock sites show nearly at H/V spectral ratio, all stations on soft sites show a peak at very low, 0.1- 0.2Hz frequencies. Analytical computations have been carried out to verify this low frequency behaviour and have shown that these peaks are due to the fundamental frequency of the overall sediment thickness. H/V ratios have also been calculated from seismograms of weak local earthquakes, so they could be compared with ratios obtained from noise measurements.

  • Nakamura Y 1989: Rept. Railway Tech. Res. Inst., 30, 25--33.

    () 30 Rept. Railway Tech. Res. Inst. : 25 -33.

  • Zaré M, Bard P-Y, Ghafory-Ashtiany M 1998: Soil Dynamics and Earthquake Engineering, 18, 101--123.

    () 18 Soil Dynamics and Earthquake Engineering : 101 -123.

  • Zilahi-Sebess L, Mészáros F, 1992: összefoglaló a földrengés veszélyeztetettség témában az MGF által 1991-ben végzett munkáról. Kutatási jelentés, MáELGI, Budapest

    összefoglaló a földrengés veszélyeztetettség témában az MGF által 1991-ben végzett munkáról. Kutatási jelentés , ().

    • Search Google Scholar
  • Tóth L, Mónus P, Zsíros T 1999: Hungarian Earthquake Bulletin 1998; GeoRisk Ltd., Budapest

    Hungarian Earthquake Bulletin 1998 , ().

  • Bour M, Fouissac D, Dominique P, Mirtin C 1998: Soil Dynamics and Earthquake Engineering, 17, 456--474.

    () 17 Soil Dynamics and Earthquake Engineering : 456 -474.

  • Field M, Jacob K 1993: Geophysical Research Letters, 20, 2925--2928.

    () 20 Geophysical Research Letters : 2925 -2928.

  • Chávez-García F J, Pedotti G, Hatzfeld D, Bard P-Y 1990: Bull. Seism. Soc. Am., 80, 784--806.

    () 80 Bull. Seism. Soc. Am. : 784 -806.

  • Gitterman Y, Zaslavsky Y, Shapira A 1994: In: ESC XXIV. General Assembly 1994, Athens, Greece, Proceedings and Activity Reports 1992--94, University of Athens, Volume III, 1595--1597.

    , , .

  • How Lennartz seismometers work? http://www.lennartz-electronic.de/Pages/English/Seismology/Seismology_e.html

  • Idriss I M, Sun J I 1992: User's manual for SHAKE91. Department of Civil and Environmental Engineering, Univ. California, Davis

    User's manual for SHAKE91. Department of Civil and Environmental Engineering , ().

    • Search Google Scholar
  • Kilényi é, Šefara J (eds) 1989: Pre-Tertiary basement contour map of the Carpatian Basin beneath Austria, Czechoslovakia and Hungary. Map 1:500000, ELGI, Budapest

    Pre-Tertiary basement contour map of the Carpatian Basin beneath Austria, Czechoslovakia and Hungary , ().

    • Search Google Scholar
  • Lermo J, Chávez-García F J 1994: Bull. Seim. Soc. Am., 84, 1350--1364.

    () 84 Bull. Seim. Soc. Am. : 1350 -1364.

  • Mucciarelli, Monachesi 1998: Journal of Earthquake Engineering, 2, 325--337.

    () 2 Journal of Earthquake Engineering : 325 -337.

  • Press W H, Flannery B P, Teukolsky S A, Vetterling W T 1993: Numerical Recipes in C, Hardback, 549--557.

    () Numerical Recipes in C, Hardback : 549 -557.

  • Raptakis D, Karaolani E, Pitilakis K, Theodulidis N 1994: In: ESC XXIV. General Assembly 1994, Athens, Greece, Proceedings and Activity Reports 1992--94, University of Athens, Volume III, 1570--1577.

    ESC XXIV. General Assembly 1994, Athens, Greece III 1570 1577

  • Seekins L C, Wennerberg L, Margheriti L, Liu H-P 1996: Bull. Seism. Soc. Am., 86, 627--635.

    () 86 Bull. Seism. Soc. Am. : 627 -635.

  • Schnabel B, Lysmer J, Seed H B 1972: SHAKE, a Computer Program for Earthquake Response Analysis of Horizontally Layered Sites. College of Engineering University of California Berkeley, California

    SHAKE, a Computer Program for Earthquake Response Analysis of Horizontally Layered Sites , ().

    • Search Google Scholar
  • Tento A 1994: In: (Italy). ESC XXIV. General Assembly 1994, Athens, Greece, Proceedings and Activity Reports 1992--94, University of Athens, Volume III, 1602--1609.

    Tento A III 1602 1609

  • Theodulidis N P, Bard P-Y 1995: Soil Dynamics and Earthquake Engineering, 14, 177--197.

    () 14 Soil Dynamics and Earthquake Engineering : 177 -197.

  • Theodulidis N P, Archuleta R, Bard P-Y, Bouchon M 1993: In: Proc. Fall Meeting of AGU, San Francisco (abstract)

  • Theodulidis N P, Tsakalidis K 1994: In: ESC XXIV. General Assembly 1994, Athens, Greece, Proceedings and Activity Reports 1992--94, University of Athens, Volume III, 1640--1649.

    III 1640 1649