Seismodeformations in Late Holocene estuary deposits in the central part of St. Petersburg

Deformations in a section of layered Late Holocene estuary-flood-plain deposits, found for the first time in the central part of St. Petersburg, are discussed. The discussed reason why this section could have been deformed inside the undeformed stratum is a horizontally directed dynamical shock. The probable causes of deformation are considered, with the most real one being a relatively distant earthquake. An attempt is made to estimate the intensity of this quake for the territory of the city.