Marine Geophysics and Hydroacoustics

Projects

The projects of the group are located in various parts of the world, both in the middle of the oceans and near coastlines close to Kiel. Also remote lakes, only reached by helicopter, are investigated.

ECOMAP

 

Summary

Baltic Sea environmental assessments by innovative opto-acoustic remote sensing, mapping, and monitoring

The EU program BONUS will fund our project ECOMAP (start 1st of October 2017). The goal of ECOMAP is to develop innovative methods for improved remote sensing of the seafloor in the Baltic Sea, especially addressing the physical impact of benthic life on the sensing procedures. We propose new measurement techniques and a catalogue detailing new procedures on how to implement remote sensing methods for selected habitats. More...

Ocean Hazard Risk Assessment

 

Summary

Studies on ocean hazard analysis and their magnitude/frequency relationship have been primarily championed by natural scientists. The physical and geological complexity of these hazards proposed by natural scientists is often not considered or adapted by social scientists during their risk and vulnerability assessments. Therefore, the field of natural hazard and risk assessment is one of the most prominent fields of research, once it comes to convergent or transdisciplinary sciences.

Submarine natural hazards like earthquakes, landslides and related tsunamis pose a great threat to coastal communities. More...

Geohazards off Southern Italy

Summary

The continental margins of southern Italy are located along converging plate boundaries, which are affected by intense seismicity and volcanic activity. Most of the coastal areas experienced severe earthquakes, landslides, and tsunamis in historical and/or modern times. The most prominent example is the Messina earthquake of Dec. 28, 1908 (Ms=7.3; 80,000 casualties), which was characterized by the worst tsunami Italy experienced in the historical time (~2000 casualties). More...

Tuaheni Landslides, offshore New Zealand

 

Summary

SCHLIP3D - Submarine Clathrate Hydrate Landslide Imaging Project (Tuaheni Slides off the east coast of New Zealand)

The dynamics of submarine landslides is only poorly understood. While some landslides rapidly disintegrate others may stay as coherent blocks. Recently, it has been proposed that submarine landslides could also be characterized by very slow (creeping) deformation. The Tuaheni landslide complex off the east coast of New Zealand may acts as key site for investigating such slow-slipping landslides. We collected a 3D-seismic dataset covering parts of the slide complex by means of the so-called P-cable system during research cruise TAN1404 (13.04. – 08.05.2014) of the Kiwi Research Vessel RV Tanagaro. More...

Western Australian Continental Shelf

SO257 - WACHEIO: Western Australian Climate History from Eastern Indian Ocean Sediment Archives

 

Summary

During Cruise SO257, a Geometrics GeoEel streamer consisting of four solid state sections (32 channels) and one standard 1.7L Generator Injector (GI)-gun were used to acquire 2D high-resolution multichannel seismic data. The aim was to acquire high-resolution shallow seismic data across a number of transects during the cruise. More ...

Grand Banks Area, New Foundland

Summary

On November 18, 1929, a M7.2 earthquake occurred beneath the Laurentian Channel off the coast of Newfoundland. Nearly simultaneously, 12 undersea trans-Atlantic communication cables were severed and within two hours, a devastating tsunami struck the south coast of Newfoundland, claiming 28 lives. Only in 1952, it was understood that a slump-generated turbidity current caused the sequential severance of the cables more

NW Africa

Summary

The passive margin off NW-Africa is investigated by the workgroup since a long time; it is shaped by a complex interplay of sediment transport processes, directed both downslope and alongslope. During several cruises, sediment transport processes between 12° and 29°N off Senegal, Mauritania, and Western Sahara were investigated by means of geophysical and sedimentological methods. More...

Rio de la Plata, offshore Uruguay

Summary

The waters off Uruguay and Northern Argentina offer the possibility to study sediment transport processes from ‘source-to-sink’ in a relatively small area.  Quickly accumulated sediments are potentially unstable and might be transported downslope in canyons and/or on the open slope. Strong contour currents result in along-slope sediment transport. Within the scope of Meteor-Cruise M78/3 more

Lake Ohrid

Summary

Lake Ohrid, located on the Balkan Peninsula within the Dinaride-Hellenide-Albanide mountain chain (Macedonia/Albania) is probably the oldest, continuously existing lake in Europe (2-5 Ma).

Surveys

Multidisciplinary including multichannel seismics, sediment echosounder, and coring at Lake Ohrid prove that it is an important archive to study the sedimentary and tectonic evolution of a graben system over a long time period. Within the frame of the International Continental Drilling Program (ICDP) a successful deep drilling campaign was carried out in spring 2013 with more than 2000 m of sediment cores at four sites. more

Siberian Lakes

PLOT - Paleolimnological Transect: Quaternary Climate Gradients Along Northern Eurasia and Potentials for Deep Drilling

 

Summary

The German-Russian PLOT project (Paleolimnological Transect) aims at investigating the climatic and environmental changes in Northern Eurasia during the Late Quaternary, through analysis of sediment records within five lakes (Ladoga, Bolshoye Shuchye, Levinson-Lessing, Taymyr and Emanda). Together with Lake El‘gygytgyn (already drilled), they form a 6000 km-long transect that will provide a comprehensive record of the Late Quaternary environmental history of Northern Eurasia. more

Caldera Lake Bolsena (Italy)

 

Summary

The Bolsena caldera formed between 0.6 and 0.2 Ma is an ideal site to study the tectonic and volcanic evolution of calderas. The main area is covered by an 150 m deep lake. A High resolution hydro-acoustic survey using a multichannel reflection seismic system and a sediment echo-sounder system were conducted in Sept. 2012.

As space was limited we used a rowing boat towed by a rubber boat to handle a 36 m long and 24 channel streamer to receive seismic reflections produced using a Mini GI-Gun (0.25 l). More

Lake Constance (Germany)

 

Summary

Lake Constance is the largest lake in Germany with a lentgh of 60 km, a width of 10 km and a maximum water depth of 250 m. Present lake level is about 395 m above sea level. Lake topography has been extensively surveyed in the last couple of years within the frame of the Projekt  "Tiefenschärfe" of the German Research Institut for lake research in Langenargen. More

NICA-BRIDGE, Lakes in Nicaragua

Seismic reconnaissance survey for the ICDP proposal ‘Paleoclimate, Paleoenvironment, and Paleoecology of Neogene Central America: Bridging Continents and Oceans

 

Summary

The two largest lakes in Central America, Lake Nicaragua and Lake Managua, are situated in the south-central part of Nicaragua. The location and the proposed long existence (at least Pliocene possibly Late Miocene) make these lakes promising targets for scientific drilling within the International Continental Drilling Program. more

Lake Van, Turkey

 

Summary

Lake Van in Eastern Anatolia (Turkey) is the fourth largest terminal lake in the world with a surface area of 3,574 km², a volume of 607 km³, a maximum depth of 450 m, and a maximal length of 130 km WSW-ENE (Wong and Degens, 1978). Over 1500 km of multi-channel seismic reflection profiles in combination with ICDP drilling and bathymetric data from Lake Van, eastern Turkey, allow to reconstruct stratigraphic evolution of the lake basin. Three major basins (Tatvan, Deveboynu and the Northern basin) are separated from each other by Ahlat and Northern ridges. more