Wave-Equation Datuming Applied to Very High-Resolution Deep-Towed Multichannel Seismic Data

The Gulf of Lions (GoL) is a passive margin of about 200 km long and 70 km wide with main sediment supply from the Rhone River supplying Alpine sediments to the Rhone delta. Submarine landslides in the GoL are widespread from the upper slope to the deep basin, within the canyon flanks and in the interfluves of major canyons. The two main submarine landslides present in the GoL are the Eastern Rh&#244;ne Interfluve Slide (ERIS) and an unnamed slide complex on the western side of the Petit Rhone Canyon. Their resulting mass transport deposits (MTDs), the Rhone Eastern MTD (REMTD) and the Rhone Western MTD (RWMTD) have previously been described in detail in several studies. However, due to the lack of high-resolution multidisciplinary datasets, such as high-resolution seismic, sediment cores, and&#160;in-situ&#160;geotechnical measurements, a detailed analysis of weak layers and preconditioning factors was never performed. Here, we present a suite of a multidisciplinary dataset; particularly very high-resolution deep-towed multichannel seismic data acquired using Ifremer&#8217;s in-house acquisition system SYSIF (SYst&#232;me SIsmique de Fond) to assess seafloor instabilities in the GoL. The objectives of this study are twofold and aimed at 1) using deep-towed multichannel seismic data to capture the internal structure of the mass-wasting products previously imaged as seismically transparent or chaotic intervals in conventional seismic data; 2) using multidisciplinary dataset to analyse the basal surfaces of slope failures in the GoL. For the first time, the newly-acquired SYSIF data show in unprecedented detail the internal structure of mass-transport deposit along with small-scale slope failures. We present here an example of a failure that consists of slide blocks, folded and faulted strata with remnant stratigraphy previously associated with a transparent or chaotic facies in the conventional reflection seismic data. The combination of deep-towed seismic and sedimentological data, as well as in-situ&#160;measurements allowed us to analyse and characterize the nature of the basal surface of the slope failures in greater detail. We show that the basal surfaces of the recurring slope failures mainly consist of fine-grained clay-rich sediments as compared to turbiditic sequences typical of Rhone turbiditic system. Such observations suggest that greater degree of lithological heterogeneity in sedimentary strata promotes slope failure in the GoL, most likely related to higher liquefaction potential of coarser-grained material, excess pore pressure and possibly resulting variation in sediment strength.

Download Full-text

Use of fast simple migration processing for very high resolution seismic data

56th EAEG Meeting ◽

10.3997/2214-4609.201409992 ◽

1994 ◽

Cited By ~ 3

Author(s):

G. Lericolais ◽

M. Olagnon ◽

S. Berne

Keyword(s):

High Resolution ◽

Seismic Data ◽

Very High

Download Full-text

Processing Workflow for the Dynamic Interpretation of Very-high-resolution P-wave Seismic Data

Near Surface Geoscience 2016 - Second Applied Shallow Marine Geophysics Conference ◽

10.3997/2214-4609.201602154 ◽

2016 ◽

Cited By ~ 2

Author(s):

R. Isaenkov ◽

A.I. Ponimaskin ◽

M.J. Tokarev

Keyword(s):

High Resolution ◽

Seismic Data ◽

P Wave ◽

Dynamic Interpretation ◽

Very High

Download Full-text

Analysis of Holocene sedimentary features on the Adriatic shelf from 3D very high resolution seismic data (Triad survey)

Marine Geology ◽

10.1016/j.margeo.2004.10.002 ◽

2004 ◽

Vol 213 (1-4) ◽

pp. 73-89 ◽

Cited By ~ 18

Author(s):

T. Marsset ◽

B. Marsset ◽

Y. Thomas ◽

A. Cattaneo ◽

E. Thereau ◽

...

Keyword(s):

High Resolution ◽

Seismic Data ◽

Very High

Download Full-text

The Celtic Sea banks: an example of sand body analysis from very high-resolution seismic data

Marine Geology ◽

10.1016/s0025-3227(98)00188-1 ◽

1999 ◽

Vol 158 (1-4) ◽

pp. 89-109 ◽

Cited By ~ 20

Author(s):

T Marsset ◽

B Tessier ◽

J.-Y Reynaud ◽

M De Batist ◽

C Plagnol

Keyword(s):

High Resolution ◽

Seismic Data ◽

Sand Body ◽

Celtic Sea ◽

Very High

Download Full-text

Acquisition of high-resolution multichannel seismic data in the offshore part of the Nuussuaq Basin, central West Greenland

Geological Survey of Denmark and Greenland Bulletin ◽

10.34194/ggub.v189.5195 ◽

2001 ◽

pp. 34-40

Author(s):

Christian Marcussen ◽

James A. Chalmers ◽

Holger Lykke Andersen ◽

Rasmus Rasmussen ◽

Trine Dahl-Jensen

Keyword(s):

High Resolution ◽

Seismic Data ◽

Research Programme ◽

Geological Survey ◽

Seismic Survey ◽

Energy Research ◽

Original Series ◽

West Greenland ◽

Geological Institute ◽

Multichannel Seismic Data

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Marcussen, C., Chalmers, J. A., Lykke Andersen, H., Rasmussen, R., & Dahl-Jensen, T. (2001). Acquisition of high-resolution multichannel seismic data in the offshore part of the Nuussuaq Basin, central West Greenland. Geology of Greenland Survey Bulletin, 189, 34-40. https://doi.org/10.34194/ggub.v189.5195 _______________ A high-resolution multichannel seismic survey (project NuussuaqSeis 2000) was carried out from 18 July to 2 August 2000 in the offshore part of the Nuussuaq Basin, central West Greenland using the Danish research vessel R/V Dana with seismic equipment from the Geological Institute, Aarhus University, Denmark. Funding for the project was provided by the Danish Energy Research Programme, the Bureau of Minerals and Petroleum, Nuuk, Greenland, the Geological Institute of Aarhus University and the Geological Survey of Denmark and Greenland (GEUS). After completion of the NuussuaqSeis 2000 project, R/V Dana was used for a three-day coring project in Disko Bugt (see Kuijpers et al. 2001, this volume) before the ship returned to Denmark.

Download Full-text