Features of morphology, distribution and dynamics of pockmarks in the northeastern part of Koporsky Bay

Rumyantseva A.K.¹, Chekulaev A.V.², Budanov L.M.²

FEATURES OF MORPHOLOGY, DISTRIBUTION AND DYNAMICS OF POCKMARKS IN THE NORTHEASTERN PART OF KOPORSKY BAY

Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. Issue 10.

doi: 10.24412/2687-1092-2023-10-390-394

¹Institute of Geosciences, St. Petersburg State University, St. Petersburg, Russia

²Karpinsky Russian Geological Research Institute, St. Petersburg, Russia

Abstract. In 2023, the VSEGEI shelf team carried out work to assess the regional activity of potentially hazardous exogenous geological processes (EGP) in the coastal shelf zone of the eastern part of the Gulf of Finland of the Baltic Sea at 5 observation areas. In the work the research area «Koporsky Bay» (its northeastern part) is studied, where the largest accumulation of pockmarks in the Gulf of Finland was recorded, the regular monitoring of which began in 2011. They are likely the result of gas-fluid discharge in various facies zones of the observation area. During the work on interpreting side-scan sonar (SSS) and multibeam echo sounding (MBES) data, the cluster of pockmarks was deciphered, which involved determining their spatial location, heterogeneity of structures and dynamics over time. A map was made reflecting the dynamic features of pockmarks.

Keywords: Koporsky Bay, EGP, gas-fluid discharge, pockmark, side-scan sonar, multibeam echo sounding

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Cite this article:

Rumyantseva A.K., Chekulaev A.V., Budanov L.M. Features of morphology, distribution and dynamics of pockmarks in the northeastern part of Koporsky Bay // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. 2023. Issue 10. P. 390-394. doi: 10.24412/2687-1092-2023-10-390-394