FN Archimer Export Format
PT J
TI High-resolution seismic imaging in deep sea from a joint deep-towed/OBH reflection experiment: application to a Mass Transport Complex offshore Nigeria
BT 
AF KER, Stephan
   MARSSET, Bruno
   GARZIGLIA, Sebastien
   LE GONIDEC, Y.
   GIBERT, D.
   VOISSET, Michel
   ADAMY, J.
AS 1:1,3;2:3;3:3;4:2;5:1;6:3;7:4;
FF 1:PDG-REM-GM-LGG;2:PDG-REM-GM-LGG;3:PDG-REM-GM-LES;4:;5:;6:PDG-REM-GM-CTD;7:;
C1 CNRS, Inst Phys Globe Paris, CNRS, UMR 7154, F-75252 Paris, France
   Univ Rennes 1, Geosci Rennes CNRS UMR 6118, F-35042 Rennes, France
   IFREMER, Departement Geosciences marines, France
   TOTAL, France
C2 CNRS, FRANCE
   UNIV RENNES, FRANCE
   IFREMER, FRANCE
   TOTAL, FRANCE
SI BREST
SE PDG-REM-GM-LGG
   PDG-REM-GM-LES
   PDG-REM-GM-CTD
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.411
TC 30
TU Centre national de la recherche scientifique
   Institut National de l'Information Géographique et Forestière
   Institut de physique du globe
   Université Paris Diderot
   Université Pierre et Marie Curie
   Université de La Réunion
   Université de Rennes 1
UR https://archimer.ifremer.fr/doc/00044/15510/12959.pdf
LA English
DT Article
CR ERIG 3D
BO Pourquoi pas ?
DE ;Controlled source seismology;Seismic tomography;Acoustic properties;Submarine landslides;Atlantic Ocean
AB P>We assess the feasibility of high-resolution seismic depth imaging in deep water based on a new geophysical approach involving the joint use of a deep-towed seismic device (SYSIF) and ocean bottom hydrophones (OBHs). Source signature measurement enables signature deconvolution to be used to improve the vertical resolution and signal-to-noise ratio. The source signature was also used to precisely determine direct traveltimes that were inverted to relocate source and receiver positions. The very high accuracy of the positioning that was obtained enabled depth imaging and a stack of the OBH data to be performed. The determination of the P-wave velocity distribution was realized by the adaptation of an iterative focusing approach to the specific acquisition geometry. This innovative experiment combined with advanced processing succeeded in reaching lateral and vertical resolution (2.5 and 1 m) in accordance with the objectives of imaging fine scale structures and correlation with in situ measurements. To illustrate the technological and processing advances of the approach, we present a first application performed during the ERIG3D cruise offshore Nigeria with the seismic data acquired over NG1, a buried Mass Transport Complex (MTC) interpreted as a debris flow by conventional data. Evidence for a slide nature of a part of the MTC was provided by the high resolution of the OBH depth images. Rigid behaviour may be inferred from movement of coherent material inside the MTC and thrust structures at the base of the MTC. Furthermore, a silt layer that was disrupted during emplacement but has maintained its stratigraphic position supports a short transport distance.
PY 2010
PD SEP
SO Geophysical Journal International
SN 0956-540X
PU Wiley-blackwell Publishing, Inc
VL 182
IS 3
UT 000280997700030
BP 1524
EP 1542
DI 10.1111/j.1365-246X.2010.04700.x
ID 15510
ER

EF