Alexakis, S.

Karageorgis, A. P.

Linke, Peter

Patiris, D. L.

Prospathopoulos, A.

Schmidt, Mark

Tsabaris, C.

OceanRep

- 6 -  26th Symposium of HNPS 9-10 June 2017 Oral Presentations Submarine pockmarks area localization using in-situ radio-tracing technique in Eckernförde bay, Germany*  D.L. Patiris1, C. Tsabaris1, M. Schmidt2, A.P. Karageorgis1, A. Prospathopoulos1, S. Alexakis1, P. Linke2   1Institute of Oceanography, Hellenic Centre of Marine Research, Anavyssos, Attiki, 19013, Greece. 2GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3, 24148 Kiel, Germany.  Eckernförde Bay is a narrow bay (“Förde” in German or “Fjord” in Danish) of 16 km length and 2–6 km wide situated on the east coast of Schleswig-Holstein (northern Germany) in the south-western Baltic Sea. For the scientific community, noteworthy aspects of the bay concerns the extensive methane production in sediment and the presence of pockmarks areas. Pockmarks are morphological seafloor’s depressions (craters) of atypical shapes with depth of 1-2 m which in numbers form pockmarks areas. The main pockmarks areas are located in the centre of the bay and along the south bank. Interstitial fluids of the sediments in the pockmarks contain very low or undetectable methane concentrations so, methane production does not involve in creation neither in maintenance of the pockmarks. The pockmarks of the bay are submarine springs of non-continuous but rather episodic groundwater emanation. Groundwater is rich in natural radionuclides and especially in radon gas. The aim of the present work was to assess the possibility of pockmarks localization by radio-tracing method based on spatial variations of radon progeny (bismuth 214Bi) and natural radioisotope of potassium (40K) as well as, to provide an estimation of radon activity concentration in the emanating groundwater flows.         *This work was implemented in the framework of the EU funded Horizon 2020 COST Action ES1301 “COST – FLOWS: Impact of Fluid circulation in old oceanic Lithosphere on the seismicity of transform-type plate boundaries: new solutions for early seismic monitoring of major European Seismogenic zones”.     

Submarine pockmarks area localization using in-situ radio-tracing technique in Eckernförde bay, Germany

Abstract

Similar works

Full text

Available Versions

OceanRep