Comprehensive investigation of intact, vulnerable stalagmites to estimate an upper limit on prehistoric ground acceleration

Gribovszki, Katalin Eszter and Bokelmann, G. and Szeidovitz, Győző and Varga, Péter and Paskaleva, I and Kovács, Károly (2013) Comprehensive investigation of intact, vulnerable stalagmites to estimate an upper limit on prehistoric ground acceleration. In: Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics 2013 (VEESD 2013) - 13. D-A-CH Tagung, 2013.08.28-2013.08.30, Vienna.

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Abstract

Non-intrusive in situ measurements were carried out in caves in Hungary, Bulgaria and Slovakia in order to determine the fundamental frequencies (FF) and horizontal ground accelerations (HGA) resulting in failure of intact, slim, vulnerable stalagmites. Similar investigations are planned in Austria at the Eastern Alps. The main steps of investigation are: 1) FF of intact stalagmites were determined by in situ observation. 2) Density, Young’s modulus and tensile fa ilure stress of broken stalagmites ha ve been measured in mechanical laboratory. 3) The value of HGA resulting in failure and FF of stalagmite were assessed by theoretical calculations. 4) Age determination of co re-samples. The upper limit for HGA, a g , for slim stalagmites determined by theoretical calculations, can arise even for moderate-sized eart hquakes. The FF of the investigated stalagmites are low. The geological stru ctures close to the investigated caves did not excite paleoearthquakes in the determined time period, corresponding to HGA larger than the determined a g values.

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