New results from the GREBAL Project – Traces of Pleistocene earthquakes in the Baltic Basin

The recognition of sedimentological traces of earthquakes in the form of seismites within Pleistocene sediments is the main objective of the GREBAL project (Recognition of traces left by earthquakes in Pleistocene sediments affected by glacio- isostatic rebound in the Baltic Sea Basin). The investigations focus primarily on Poland, Germany, Latvia, Estonia and Lithuania. Project leader Małgorzata (Gosia) Pisarska-Jamroży has summed up new results from this international research effort.

Results of sedimentological studies as well as stratigraphical and geochronological data in relation to the broader geological context led us to the following conclusions: 1) seismic activity did accompany Saalian and Weichselian glaciations (during or after the deglaciation and during ice-advance periods); 2) earthquakes caused by the reactivation of deeply-rooted pre-Quaternary faults due to glacially-induced stress state changes; 3) in some cases, glacial earthquakes caused (e.g. by large-scale stick-slip motion) are also discussed as a possible source of seismic activity.

Read more about the project and see some beautiful seismites here: https://grebal.amu.edu.pl/

 

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Christoph Grützner

Christoph Grützner

works at the Institute of Geological Sciences, Jena University. He likes Central Asia and the Mediterranean and looks for ancient earthquakes.

See all posts Christoph Grützner

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