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17 - Glacially Induced Faulting in Poland
from Part IV - Glacially Triggered Faulting at the Edge and in the Periphery of the Fennoscandian Shield
- By Małgorzata (Gosia) Pisarska-Jamroży, Piotr Paweł Woźniak, A. J. (Tom) van Loon
Edited by Holger Steffen, Odleiv Olesen, Raimo Sutinen
Book:

Glacially-Triggered Faulting

Published online:

02 December 2021

Print publication:

16 December 2021, pp 304-319
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Summary

Poland is in an intraplate area characterized almost everywhere by low recent tectonic activity. This does not imply, however, that earthquakes have not affected it, even in the – geologically speaking – recent geological past. This is due to Pleistocene glaciations, which left traces in the form of earthquake-induced deformed layers. The strongly deformed layers (seismites) as well as some fault zones with significant offsets crossing also Quaternary sediments can indicate fault (re-)activation due to glacial isostatic adjustment. We inventory and describe the five sites/areas in the intraplate northern and central parts of Poland where traces of glacial isostatic adjustment occur. We do not deal, however, with the mountain areas of southern Poland, because Alpine pressure and glacial isostatic adjustment may each, possibly jointly, have acted there as a trigger; distinguishing between traces left by them is not yet viable.