2010 07 - NAWIGATOR XXI Cruise

NAWIGATOR XXI - 19.07. - 25.07.2010 - Baltic Sea: Szczecin - Szczecin

Working Areas in Baltic Sea:Polish Baltic Sea

BONUS+ (Baltic Gas) international PhD training course – Seismoacoustic imaging of Sedimentary and Gas-related Features in the Baltic Sea

This cruise was part of the EU-funded project BONUS Baltic Gas and was funded/sponsored by the partners bewlo as well as MARUM, GLOMAR and BONUS EEIG.

Partners

  • Department of Geosciences, University of Bremen, Bremen, Germanry (GeoB)
  • Department of Geosciences, Szczecin, Poland, 
  • Maritime University, Szczecin, Poland

Seismic Instrumentation

  • micro GI Gun 2 x 0.1 L (Generator-Injector; Sodera)
  • Arstech Streamer 50 m 48 channels (single hydrophones)
  • HTI digital streamer 50 m 48 channels (single hydrophone)
  • MaMuCS Recording System
  • Side Scan Sonar OMS 460 Octopus, 100 kHz (Edgetech)

MTU Participants:

  • Spiess, Volkhard
  • Fekete, Noemi
  • Toth, Zsuzsanna
  • Xing, Junhui
  • Lenhart, Antje
  • Meier, Florian (IWES)
  • Fan, Wenfang

plus 16 further participants from Szczecin University, Zopot, Lund, Kaliningrad, Bremen


A training BONUS-course Seismo-acoustic Imaging of Sedimentary and Gas-related Features in the Baltic Sea organized by University of Bremen, Germany, and University of Szczecin, Poland, took place in the Malkocin Conference Center of the University of Szczecin (Poland) and on board the Polish M/V Nawigator XXI during 15-27 July, 2010.

Altogether 20 students participated of which 6 students came from the University of Szczecin (Poland) and 14 students were active in the BONUS-projects: Baltic Gas, Inflow and Hyper comprising the „BONUS-institutions: Institute of Oceanology of the Polish Academy of Sciences (Poland), P.P. Shirshov Institute of Oceanology of the Russian Academy of Sciences (Kaliningrad, Russia), University of Lund (Sweden) and University of Bremen (Germany).

During the three-day preparatory course the marine geology of the Baltic Sea was presented by an invited lecture (Jan Harff, IOW/US), and the relevant instruments and survey methods of acoustic surface and sub-surface imagery were introduced to both geophysicist and non-geophysicist participants. Discussions about cruise-planning strategies aimed to acquaint participants with considerations leading to flexibility and suc-cessful decisions in scientific cruise management.

The seagoing expedition on M/V Nawigator XXI was carried out in the Polish waters of the Baltic Sea. Seismic and side scan sonar data were collected in the Pomeranian Bay, eastern Bornholm Deep and offshore Wladyslawowo. During these days, participants gathered experience in equipment handling, data acquisition, processing of seismoacoustic data, and using preliminary interpretations to aid cruise planning. 

The expedition was followed by a two-day post-cruise workshop. Results were evaluated, put in scientific context, and collected in a preliminary cruise report. Cruise participants presented selected topics in short lectures, highlighting different aspects of new data from the perspective of regional geology. Main scientific results include indications of shallow gas found south of Bornholm (Fig.3.), and the mapping of a basement fault zone in the eastern study area. 



As acoustic equipment, Bremen University provided a high.resolution multichannel seismic streamer with single hydrophones at 1 m spacing and and a high-resolution airgun source (micro GI Gun, double chamber, 2 x 0.1 L). Altogether 16 multichannel seismic lines had been acquired, four of the in the southernmost Bornholm Basin, the remaining in areas, where previous studies had indicated gas bubble in the water column, likely from deeper gas sources.

As complementary information, a side scan sonar from Szczecin University could be used and a few lines run concurrently with the MCS profiles could be gathered.


They reveal typical surficial features such as exposed glacial till deposits, sand dunes/waves or ripples and fault expressions.













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