Estimating the upper limit of prehistoric peak ground acceleration using an in situ, intact and vulnerable stalagmite from Plavecká priepast cave (Detrekői-zsomboly), Little Carpathians, Slovakia - first results\n

0482230 - ÚGN 2018 RIV NL eng J - Journal Article
Gribovszki, K. - Kovács, K. - Mónus, P. - Bokelmann, G. - Konečný, P. - Lednická, Markéta - Moseley, G. - Spötl, C. - Edwards, R. L. - Bednárik, M. - Brimich, L. - Tóth, L.
Estimating the upper limit of prehistoric peak ground acceleration using an in situ, intact and vulnerable stalagmite from Plavecká priepast cave (Detrekői-zsomboly), Little Carpathians, Slovakia - first results
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Journal of Seismology. Roč. 21, č. 5 (2017), s. 1111-1130. ISSN 1383-4649. E-ISSN 1573-157X
R&D Projects: GA MŠMT(CZ) LO1406; GA MŠMT ED2.1.00/03.0082
Institutional support: RVO:68145535
Keywords : speleology * cantilever beam * natural frequency * peak ground acceleration * speleoseismology
OECD category: Environmental and geological engineering, geotechnics
Impact factor: 1.128, year: 2017
https://link.springer.com/content/pdf/10.1007%2Fs10950-017-9655-3.pdf

Earthquakes hit urban centres in Europe infrequently, but occasionally with disastrous effects. Obtaining an unbiased view of seismic hazard (and risk) is therefore very important. In principle, the best way to test probabilistic seismic hazard assessments (PSHAs) is to compare them with observations that are entirely independent of the procedure used to produce PSHA models. Arguably, the most valuable information in this context should be information on long-term hazard, namely maximum intensities (or magnitudes) occurring over time intervals that are at least as long as a seismic cycle. The new observations can provide information of maximum intensity (or magnitude) for long timescale as an input data for PSHA studies as well. Long-term information can be gained from intact stalagmites in natural caves. These formations survived all earthquakes that have occurred over thousands of years, depending on the age of the stalagmite. Their 'survival' requires that the horizontal ground acceleration (HGA) has never exceeded a certain critical value within that time period. Here, we present such a stalagmite-based case study from the Little Carpathians of Slovakia. A specially shaped, intact and vulnerable stalagmite in the Plavecka priepast cave was examined in 2013. This stalagmite is suitable for estimating the upper limit of horizontal peak ground acceleration generated by prehistoric earthquakes. The critical HGA values as a function of time going back into the past determined from the stalagmite that we investigated are presented. For example, at the time of Joko event (1906), the critical HGA value cannot have been higher than 1 and 1.3 m/s(2) at the time of the assumed Carnuntum event (similar to 340 AD), and 3000 years ago, it must have been lower than 1.7 m/s(2). We claimed that the effect of Joko earthquake (1906) on the location of the Plavecka priepast cave is consistent with the critical HGA value provided by the stalagmite we investigated.
Permanent Link: http://hdl.handle.net/11104/0277611