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Journal of Seismology

, Volume 12, Issue 1, pp 21–33 | Cite as

Estimation of an upper limit on prehistoric peak ground acceleration using the parameters of intact speleothems in Hungarian caves

  • Győző Szeidovitz
  • Gergely Surányi
  • Katalin Gribovszki
  • Zoltán Bus
  • Szabolcs Leél-Őssy
  • Zsolt Varga
Original Article

Abstract

The examination of speleothems in the Hajnóczy and Baradla caves (northeastern Hungary) allows estimating an upper limit for horizontal peak ground acceleration generated by paleoearthquakes. The density, the Young’s modulus and the tensile failure stress of the samples originating from a broken speleothem have been measured in a laboratory, whereas the natural frequency of intact speleothems was determined by in situ observations. The value of horizontal ground acceleration resulting in failure, the natural frequency and the inner friction coefficient of speleothems were assessed by theoretical calculations. The ages of the samples taken from a stalagmite 5.1 m in height (Baradla cave) have been determined by inductively coupled plasma mass spectrometry analysis and alpha spectrometry. The measured ages fall between 140,000 and 70,000 years; therefore, we assume the speleothem has not been changed since the end of this time interval. According to our modeling results, this speleothem has not been excited by a horizontal acceleration higher than 0.05 g during the last 70,000 years.

Keywords

Speleothems Paleoearthquakes Earthquake hazard 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Győző Szeidovitz
    • 1
  • Gergely Surányi
    • 2
  • Katalin Gribovszki
    • 1
  • Zoltán Bus
    • 1
  • Szabolcs Leél-Őssy
    • 3
  • Zsolt Varga
    • 4
  1. 1.Hungarian Academy of Sciences, Geodetic, and Geophysical Research Institute, Seismological ObservatoryBudapestHungary
  2. 2.MTA-ELTE Geological, Geophysical and Space Science Research GroupBudapestHungary
  3. 3.Department of Physical and Historical GeologyELTE University BudapestBudapestHungary
  4. 4.Institute of Isotopes, Department of Radiation SafetyHungarian Academy of SciencesBudapestHungary

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