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1822 earthquake‐triggered homogenite in Lake Le Bourget (NW Alps)
Author(s) -
Chapron E.,
Beck C.,
Pourchet M.,
Deconinck JF.
Publication year - 1999
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.1999.00230.x
Subject(s) - geology , coring , seiche , seismology , homogeneous , high resolution , paleontology , remote sensing , mechanical engineering , drilling , physics , engineering , thermodynamics
High‐resolution textural signatures of an earthquake‐induced historical ‘homogenite’ layer are presented, as well as its 3D distribution. This homogeneous deposit is correlated with the AD 1822 event (VII–VIII MSK intensity), the main historical earthquake of the French outer Alps, using 210 Pb dating and historical chronicles. During this earthquake a violent lake water oscillation was reported (seiche effect). In the present study we discuss the influence of lake water oscillations during earthquake‐induced subaqueous slide, through a pluridisciplinary analysis of subbottom sediments including high‐resolution seismic, sidescan sonar and short gravity coring.