Seismicity and sources of stress in Fennoscandia

Søren Gregersen, Conrad Lindholm, Annakaisa Korja, Björn Lund, Marja Uski, Kati Oinonen, Peter H. Voss, Marie Keiding

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Abstract

This chapter investigates the Fennoscandian uplift area since the latest Ice Age and addresses the question if glacial isostatic adjustment may influence current seismicity. The region is in an intraplate area, with stresses caused by the lithospheric relative plate motions. Discussions on whether uplift and plate tectonics are the only causes of stress have been going on for many years in the scientific community.

This review considers the improved sensitivity of the seismograph networks, and at the same time attempts to omit man-made explosions and mining events in the pattern, to present the best possible earthquake pattern. Stress orientations and their connection to the uplift pattern and known tectonics are evaluated. Besides plate motion and uplift, one finds that some regions are affected stress-wise by differences in geographical sediment loading as well as by topography variations. The stress release in the present-day earthquakes shows a pattern that deviates from that of the time right after the Ice Age. This chapter treats the stress pattern generalized for Fennoscandia and guides the interested reader to more details in the national chapters.
Original languageEnglish
Title of host publicationGlacially-Triggered Faulting
EditorsHolger Steffen, Odleiv Olesen, Raimo Sutinen
Place of PublicationCambridge
PublisherCambridge University Press
Chapter10
Pages177-197
Number of pages21
ISBN (Print)9781108490023
DOIs
Publication statusPublished - 2021

Programme Area

  • Programme Area 3: Energy Resources

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