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Is an earthquake scenario compatible with the fall of the 'Grand Menhir Brisé' of Locmariaquer (Brittany, France)?

Authors :
Montabert, Arnaud
Giry, Cédric
Pelenc, Raphaël
Dahou, Amine Ben
Bonnin, Mickaël
Fligiel, Damien
Launeau, Patrick
Perrin, Clément
Cassen, Serge
Lyon-Caen, Hélène
Mocquet, Antoine
Source :
Bulletin of the Geological Society of Greece; 2023 Special Issue, p178-181, 4p
Publication Year :
2023

Abstract

The menhir of Locmariaquer lays in four fragments 200 m north of Locmariaquer (Morbihan, Brittany, France). Several hypotheses have been raised over time to explain its fall. This study discusses a potential earthquake origin and investigates the associated ground motion features. The historical seismicity and the current instrumental seismicity support the concept of an active seismic area. Soil and subsurface characterization highlights a complex site response. Several models of the menhir based on archaeological observations are proposed to simulate the dynamic response of the menhir. A ground motion selection from the European Strong Motion database is used as inputs. An earthquake scenario is compatible with the fall of the menhir. The associated Intensity Measures are discussed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
04389557
Database :
Complementary Index
Journal :
Bulletin of the Geological Society of Greece
Publication Type :
Academic Journal
Accession number :
173798988