Le tremblement de terre du 18 septembre 1692 dans le nord de l'Ardenne (Belgique) : Impact sur le patrimoine architectural

in Levret, Agnès (Ed.) Actes des VIes Rencontres du groupe APS "Archéosismicité et Vulnérabilité. Environnement, bâti ancien et société" (Perpignan, 4-5.10.2002) (2008)

Relevance of active faulting and seismicity studies to assessments of long-term earthquake activity and maximum magnitude in intraplate northwest Europe, between the Lower Rhine Embayment and the North Sea

in Stein, S.; Mazzotti, S. (Eds.) Continental Intraplate Earthquakes: Science, Hazard and Policy Issues (2007)

Present-day vertical crustal motion and active faulting in the Roer graben

Conference (2003)

Modelling of speleothems failure in the Hotton cave (Belgium). Is the failure earthquake induced?

in Netherlands Journal of Geosciences - Geologie en Mijnbouw (2001), 80(3-4), 315-321

To provide quantitative information on the ground acceleration necessary to break speleothems, laboratory measurements on samples of stalagmite have been performed to study their failure in bending. Due ... [more ▼]

To provide quantitative information on the ground acceleration necessary to break speleothems, laboratory measurements on samples of stalagmite have been performed to study their failure in bending. Due to their high natural frequencies, speleothems can be considered as rigid bodies to seismic strong ground motion. Using this simple hypothesis and the determined mechanical properties (a minimum value of 0.4 MPa for the tensile failure stress has been considered), modelling indicates that horizontal acceleration ranging from 0.3 m/s(2) to 100 m/s(2) (0.03 to 10g) are necessary to break 35 broken speleothems of the Hotton cave for which the geometrical parameters have been determined. Thus, at the present time, a strong discrepancy exists between the peak accelerations observed during earthquakes and most of the calculated values necessary to break speleothems. One of the future research efforts will be to understand the reasons of the defined behaviour. It appears fundamental to perform measurements on in situ speleothems. [less ▲]