FN Archimer Export Format
PT J
TI Searching for the seafloor signature of the 21 May 2003 Boumerdès earthquake offshore central Algeria
BT 
AF CATTANEO, Antonio
   BABONNEAU, Nathalie
   RATZOV, G.
   DAN-UNTERSEH, G.
   YELLES, K.
   BRACENE, R.
   MERCIER DE LEPINAY, Bernard
   BOUDIAF, A.
   DEVERCHERE, Jacques
AS 1:1;2:2;3:2;4:2;5:3;6:6;7:4;8:5;9:2;
FF 1:PDG-REM-GM-LES;2:;3:;4:;5:;6:;7:;8:;9:;
C1 IFREMER, GM LES, F-29280 Plouzane, France.
   Univ Brest, IUEM, CNRS, UMR6538, F-29280 Plouzane, France.
   CRAAG, Algiers, Algeria.
   CNRS, UMR6526, F-06560 Valbonne, France.
   Univ Sci Montpellier2, F-34200 Sete, France.
   SONATRACH, Division Exploration, Boumerd`es, Algeria
C2 IFREMER, FRANCE
   UBO, FRANCE
   CRAAG, ALGERIA
   CNRS, FRANCE
   UNIV MONTPELLIER, FRANCE
   SONATRACH, ALGERIA
SI BREST
SE PDG-REM-GM-LES
   PDG-REM-GM
   IUEM
IN WOS Ifremer jusqu'en 2018
   DOAJ
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 1.75
TC 28
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Observatoire de la côte d'azur
   Service Hydrographique et Océanographique de la Marine
   Université Nice - Sophia-Antipolis
   Université Pierre et Marie Curie
   Université de Bretagne Occidentale
   Université de Bretagne-Sud
UR https://archimer.ifremer.fr/doc/00098/20959/18571.pdf
LA English
DT Article
CR MARADJA
   MARADJA/2
   PRISME
   SAMRA
BO Le Suroît
   L'Atalante
DE ;western mediterranean sea;cascadia subduction zone;turbidity current;zemmouri earthquake;sedimentary processes;submarine landslides;northern algeria;margin;gps;boundary
AB Shaking by moderate to large earthquakes in the Mediterranean Sea has proved in the past to potentially trigger catastrophic sediment collapse and flow. On 21 May 2003, a magnitude 6.8 earthquake located near BoumerdSs (central Algerian coast) triggered large turbidity currents responsible for 29 submarine cable breaks at the foot of the continental slope over similar to similar to 150 km from west to east. Seafloor bathymetry and backscatter imagery show the potential imprints of the 2003 event and of previous events. Large slope scarps resulting from active deformation may locally enhance sediment instabilities, although faults are not directly visible at the seafloor. Erosion is evident at the foot of the margin and along the paths of the numerous canyons and valleys. Cable breaks are located at the outlets of submarine valleys and in areas of turbiditic levee overspilling and demonstrate the multi-source and multi-path character of the 2003 turbiditic event. Rough estimates of turbidity flow velocity are not straightforward because of the multiple breaks along the same cable, but seem compatible with those measured in other submarine cable break studies elsewhere. While the signature of the turbidity currents is mostly erosional on the continental slope, turbidite beds alternating with hemipelagites accumulate in the distal reaches of sediment dispersal systems. In perspective, more chronological work on distal turbidite successions offshore Algeria offers promising perspectives for paleoseismology reconstructions based on turbidite dating, if synchronous turbidites along independent sedimentary dispersal systems are found to support triggering by major earthquakes. Preliminary results on sediment core PSM-KS23 off BoumerdSs typically show a 800-yr interval between turbidites during the Holocene, in accordance with the estimated mean seismic cycle on land, even if at this stage it is not yet possible to prove the earthquake origin of all the turbidites.
PY 2012
SO Natural Hazards And Earth System Sciences
SN 1561-8633
PU Copernicus Gesellschaft Mbh
VL 12
IS 7
UT 000306974200004
BP 2159
EP 2172
DI 10.5194/nhess-12-2159-2012
ID 20959
ER

EF