WEDGE-SHAPED STRUCTURES IN UNCONSOLIDATED DEPOSITS OF THE NEVA LOWLAND AS A RESULT OF SEISMIC EFFECTS IN THE EARLY HOLOCENE: THE NIZINO CASE STUDY
https://doi.org/10.7868/S0435428118020086
Abstract
The article discusses the origin of wedge-shaped structures observed on southern lowland of the Gulf of Finland near the village of Nizino in 2000–2005 and 2014. Obtained results confirm the seismic origin of the wedges. Morphological characteristics, nature and consistency of the filling, deformation of the enclosing strata show the instant disclosure, a quick one-act filling cavities with material from the sides and roof, the subsequent momentary closure with compression in connection with the directed lateral dynamic effects. In addition, we analyzed the distribution of various deformation structures in Paleozoic rocks and postglacial sediments within this region and arrived to the conclusion about their structural control and paleoseismic origin.
About the Authors
S. V. SHVAREV
Institute of geography RAS
Russian Federation
Moscow, Russia
Russian Federation
Moscow, Russia
A. A. NIKONOV
Schmidt Institute of physics of the Earth RAS
Russian Federation
Moscow, Russia
Russian Federation
Moscow, Russia
A. V. RUSAKOV
Saint-Petersburg state University, Institute of Earth Sciences
Russian Federation
S-Petersburg, Russia
Russian Federation
S-Petersburg, Russia
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For citations:
SHVAREV S.V., NIKONOV A.A., RUSAKOV A.V. WEDGE-SHAPED STRUCTURES IN UNCONSOLIDATED DEPOSITS OF THE NEVA LOWLAND AS A RESULT OF SEISMIC EFFECTS IN THE EARLY HOLOCENE: THE NIZINO CASE STUDY. Geomorfologiya. 2018;(2):99-114. (In Russ.) https://doi.org/10.7868/S0435428118020086
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