000006266 001__ 6266
000006266 005__ 20230130102118.0
000006266 037__ $$aCTALK-2023-0028
000006266 100__ $$aMartin, Aurélie
000006266 245__ $$aCandlestick stalagmites, a tool to better understand the influence of past earthquakes on natural caves
000006266 260__ $$c2022
000006266 269__ $$c2022-07-26
000006266 520__ $$aCandlestick stalagmites exhibit resonance in the frequency-band of regional earthquake ground motions. An earthquake can break such elongated structures if the ground movement is strong enough. Therefore, the existence of intact stalagmites in caves would indicates that a certain level of ground movement has not been exceeded since they exist. Field surveys were carried out in the Han-sur-Lesse Cave (Belgian Ardennes) to estimate the eigenfrequencies of stalagmites of different sizes and shapes (e.g., Minaret Stalagmite, “Verviétois” gallery) and to explore their reactions to external events such as quarry blasts or earthquakes. The eigenfrequencies of the stalagmites are obtained from direct measurements of ambient seismic noise caused by human activities, microseisms, etc. Seismic sensors were placed on the stalagmites and on the nearby cave floor as well as at various other locations inside and outside the cave. Noise and transient events (e.g., quarry blasts) were recorded during weeks of continuous measurements. 3D laser scans of the stalagmites and Finite Element Modelling allowed constraining the link between their complex shape and their eigenfrequencies.
000006266 536__ $$a3Fullcost/$$c3Fullcost/$$f3Fullcost 
000006266 594__ $$aNO
000006266 700__ $$aLecocq, Thomas
000006266 700__ $$aHinzen, Klaus-G.
000006266 700__ $$aCamelbeeck, Thierry
000006266 700__ $$aQuinif, Yves 
000006266 700__ $$aFagel, Nathalie
000006266 773__ $$t18th International Congress of Speleology - Savoie Mont Blanc 2022, Bourget du Lac (France)
000006266 8560_ $$faurelie.martin@observatoire.be
000006266 85642 $$ahttps://hdl.handle.net/2268/299473
000006266 85642 $$ahttps://uis-speleo.org/wp-content/uploads/2022/09/ACTES_CONGRES_UIS_WEB_VOLUME_5.pdf
000006266 906__ $$aContributed
000006266 980__ $$aCTALKCONT