FN Archimer Export Format
PT J
TI Deep-towed high resolution seismic imaging II: Determination of P-wave velocity distribution
BT 
AF MARSSET, Bruno
   KER, Stephan
   THOMAS, Yannick
   COLIN, Florent
AS 1:1;2:1;3:1;4:1;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM-LAD;3:PDG-REM-GM-LAD;4:PDG-REM-GM-LAD;
C1 IFREMER, REM GM LAD, Ctr Brest, BP 70, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer jusqu'en 2018
IF 2.848
TC 9
UR https://archimer.ifremer.fr/doc/00418/52971/53908.pdf
LA English
DT Article
CR GHASS
BO Pourquoi pas ?
DE ;Deep-towed seismic;Seismic imaging;P-wave velocity distribution
AB The acquisition of high resolution seismic data in deep waters requires the development of deep towed seismic sources and receivers able to deal with the high hydrostatic pressure environment. The low frequency piezoelectric transducer of the SYSIF (SYstème Sismique Fond) deep towed seismic device comply with the former requirement taking advantage of the coupling of a mechanical resonance (Janus driver) and a fluid resonance (Helmholtz cavity) to produce a large frequency bandwidth acoustic signal (220–1050 Hz). The ability to perform deep towed multichannel seismic imaging with SYSIF was demonstrated in 2014, yet, the ability to determine P-wave velocity distribution wasn't achieved. P-wave velocity analysis relies on the ratio between the source-receiver offset range and the depth of the seismic reflectors, thus towing the seismic source and receivers closer to the sea bed will provide a better geometry for P-wave velocity determination. Yet, technical issues, related to the acoustic source directivity, arise for this approach in the particular framework of piezoelectric sources. A signal processing sequence is therefore added to the initial processing flow. Data acquisition took place during the GHASS (Gas Hydrates, fluid Activities and Sediment deformations in the western Black Sea) cruise in the Romanian waters of the Black Sea. The results of the imaging imagingimaiaging processing are presented for two seismic data sets acquired over gas hydrates and gas bearing sediments. The improvement in the final seismic resolution demonstrates the validity of the velocity model 
PY 2018
PD FEB
SO Deep-sea Research Part I-oceanographic Research Papers
SN 0967-0637
PU Pergamon-elsevier Science Ltd
VL 132
UT 000429293500004
BP 29
EP 36
DI 10.1016/j.dsr.2017.12.005
ID 52971
ER

EF