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P-wave velocity modelling on the West Sardinia margin

During the SARDINIA experiment, CHIRP profiles, bathymetry data, three coincident MCS reflection and wide-angle seismic profiles, and one single MCS reflection profile were collected on the West Sardinia margin. The MCS reflection data was acquired using a 4.5 km 360-trace digital streamer and a tuned airgun array of 8260 cubic inches, which was towed at a depth of 18-28 m. A total of 48 ocean bottom seismometers/hydrophones (OBS/OBH) from Ifremer, University of Brest, and Geomar Kiel were deployed on the West Sardinia margin, spaced every 7 nmi (~13 km). In five locations, three OBS were deployed at the same place to ensure the collection of data.

The airgun array consists of 16 airguns ranging from 100 cubic inch G-guns to 16 L Bolt airguns, with main frequencies centered around 10-15 Hz. The airguns were tuned to the first bubble, to enhance low frequencies and ensure deep penetration. The shot interval was 60 s at an average speed of 5 knots, which translates to a trace spacing of about 140-150 m. The sample rate was 8 ms for the micrOBS, 5 ms for the Geomar, and 4 ms for the OldOBS. A total of 3573 shots (profile GH: 1130, profile G2H2: 1214) were fired by the air gun array.

Profiles GH and G2H2, which are 160 and 200 km long transects, respectively cross the West Sardinia margin from the continental shelf to the “atypical” oceanic crust. Twenty-one ocean bottom seismometers (OBS) were deployed on the G2H2 profile, whereas sixteen were deployed on the GH profile. Additionally, the shots on this profile were recorded by eight land seismic stations (OSIRIS stations from the University of Brest and Geosciences Azur) that extended the marine profile ~150 km onshore.

For the two profiles only 33 instruments were used in the wide-angle modeling, since four instruments (OBSS06, 18a, 30a, and 30c) did not record properly.

We propose here the velocity models (v.in  files) of the 2 main profiles located on the West sardinian margin, Profile K7L2, located on the shelf and parallel to the margin, is not presented since most of the deep arrivals are masked by the presence of sea-bottom multiples, preventing an accurate wide-angle model.

 
Citation proposal
AFILHADO ALEXANDRA (Instituto Dom Luiz, Portugal) - MOULIN Maryline (Ifremer, France) - ASLANIAN Daniel (Ifremer, France) - SCHNURLE Philippe (Ifremer, France) - KLINGELHOEFER Frauke (Ifremer, France) - NOUZE Herve (Ifremer, France) - RABINEAU Marina (CNRS, France) - LEROUX Estelle (CNRS, France) - BESLIER MARIE-ODILE (Université Nice Sophia Antipolis, France) (2016) . P-wave velocity modelling on the West Sardinia margin. https://services.mspdata.eu:/geonetwork/srv/api/records/seanoe:44527

Simple

Date ( Publication )
2016-05
Date ( Revision )
2021-05-12
Other citation details
Afilhado Alexandra, Moulin Maryline, Aslanian Daniel, Schnurle Philippe, Klingelhoefer Frauke, Nouze Herve, Rabineau Marina, Leroux Estelle, Beslier Marie-Odile (2016). P-wave velocity modelling on the West Sardinia margin. SEANOE. https://doi.org/10.17882/44527

  Author

Instituto Dom Luiz, Portugal - AFILHADO ALEXANDRA  

  Author

Ifremer, France - MOULIN Maryline  

  Author

Ifremer, France - ASLANIAN Daniel  

  Author

Ifremer, France - SCHNURLE Philippe  

  Author

Ifremer, France - KLINGELHOEFER Frauke  

  Author

Ifremer, France - NOUZE Herve  

  Author

CNRS, France - RABINEAU Marina  

  Author

CNRS, France - LEROUX Estelle  

  Author

Université Nice Sophia Antipolis, France - BESLIER MARIE-ODILE  

  Publisher

SEANOE  
Keywords ( Theme )
  • Marine geology
ODATIS aggregation parameters and Essential Variable names ( Theme )
  • Waves
SeaDataNet Parameter Disciplines ( parameter )
  • Marine geology
Type de jeux de donnée ODATIS ( Theme )
  • Observational data
Use constraints
Other restrictions
Other constraints
Date ( Publication )
2016

  Publisher

Elsevier Science Bv  

  Author

Loureiro Afonso  

  Author

Afilhado Alexandra  

  Author

Matias Luis  

  Author

Moulin Maryline  

  Author

Aslanian Daniel  
Association Type
Cross reference
Initiative Type
document
Date ( Publication )
2015

  Publisher

Soc Geol France  

  Author

AFILHADO ALEXANDRA  

  Author

MOULIN MARYLINE  

  Author

ASLANIAN DANIEL  

  Author

SCHNURLE PHILIPPE  

  Author

KLINGELHOEFER FRAUKE  

  Author

NOUZE HERVE  

  Author

RABINEAU MARINA  

  Author

LEROUX ESTELLE  

  Author

BESLIER MARIE-ODILE  
Association Type
Cross reference
Initiative Type
document
Association Type
Cross reference
Initiative Type
Platform
Metadata language
English
Topic category
  • Oceans
N
S
E
W


Distribution format
  • PS, PDF, V.IN ( )

OnLine resource
Quality controlled data  
OnLine resource
DOI of the product  
OnLine resource
Seanoe  
Hierarchy level
Dataset
Statement

Metadata

File identifier
seanoe:44527   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2021-05-12
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

  Point of contact

Ifremer, France - MOULIN Maryline  

 
 

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Deployment of Microbs during the Sardinia Cruise

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