A comparison of strain rates and seismicity for Fennoscandia: Depth dependency of deformation from glacial isostatic adjustment

M. Keiding, C. Kreemer, C.D. Lindholm, S. Gradmann, O. Olesen, H.P. Kierulf

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)

Abstract

We investigate the influence of the glacial isostatic adjustment (GIA) on the deformation at the surface and at seismogenic depths in Fennoscandia. The surface strain rate field, derived from geodetic data, is controlled by GIA which causes NW-SE extension of up to 4 × 10-9 yr-1 in most of mainland Fennoscandia, surrounded by regions of radial shortening towards the centre of uplift. The seismic deformation field, derived from a new compilation of focal mechanisms, shows consistent NW-SE compression on the Norwegian continental margin and a tendency towards tension in mainland Fennoscandia. The seismic moment rate is at least two orders of magnitude smaller than the geodetic moment rate. We propose that the low level of seismicity and the tendency towards tensional focal mechanisms in mainland Fennoscandia may be explained by the destructive interference of the regional stress from ridge push with the flexural stress due to GIA.

Original languageEnglish
Pages (from-to)1021-1028
Number of pages8
JournalGeophysical Journal International
Volume202
Issue number2
DOIs
Publication statusPublished - 1 Aug 2015
Externally publishedYes

Keywords

  • Intra-plate processes
  • Lithospheric flexure
  • Neotectonics
  • Seismicity and tectonics

Programme Area

  • Programme Area 3: Energy Resources

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