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--- dbz:diendorf-boskovice_fault [2020/05/29 16:02]
petrs
+++ dbz:diendorf-boskovice_fault [2021/04/29 15:46]
petrs [Quaternary]
@@ Line 150: / Line 150: @@
   ***//Geodesy//**
     * Results of some long-term geodetic measurements in the region were interpreted as tectonic deformation in several studies (Pospíšil et al. 2009, 2010, 2012; Roštínský et al. 2013). However, editor of this text is skeptical to interpretation of these observations as due to tectonic strain because:
-      - the reported strain rates are too large (10<sup>-1</sup> mm/y, i.e. same order as in the eastern Alps) to be in agreement, on a regional scale, with concept of active Alpine orogen vs. stable foreland;
+      - the reported strain rates and slip rates are too large (slip rate of 10<sup>-1</sup> mm/y, i.e. same order as the faults in the eastern Alps) to be in agreement, on a regional scale, with concept of active Alpine orogen vs. stable foreland;
       - the locally observed geological records rule out that such deformation at BF could have been operative on a long-term scale during Quaternary;
-      - the non-tectonic deformation (climatic/hydrogeological, slope instability, problematic long-term stabilization of measurement points) of the surface is expected to compete with such strain rates or exceed them (see the extensive literature on the effects of water management and climatic change on surface deformation and Vyskočil 1996). For example, repeated levelling on a profile crossing the BF near Tetčice (section BF_6; Roštínský et al. 2013) and suggesting vertical strain of 10<sup>-1</sup> mm/y order, was partly carried out in the area of former pond (see maps of the 1<sup>st</sup> military mapping from 1764-1768) and therefore likely affected by ongoing sediment compaction.
+      - the non-tectonic deformation (climatic/hydrogeological, slope instability, problematic long-term stabilization of measurement points) of the surface is expected to compete with such strain rates or exceed them (see the extensive literature on the effects of water management and climatic change on surface deformation and Vyskočil 1996). For example, repeated levelling on a profile crossing the BF near Tetčice (section BF_6; Roštínský et al. 2013) and suggesting vertical slip rate of 10<sup>-1</sup> mm/y order, was partly carried out in the area of former pond (see maps of the 1<sup>st</sup> military mapping from 1764-1768) and therefore likely affected by ongoing sediment compaction.
 :!: **Basing on this local evidence the fault activity is currently evaluated in a following way:**
   *In the southern part of DBF, the sections DF_1 to BF_2 are ranked **class 3**, i.e. assumed or admitted to be active but without direct evidence. Quaternary slip rate at fault sections north of DF_3 is assumed very low (<0.01 mm/y). Southern sections may later be ranked class 1 (demonstrably active) when new earthquake data (better location, focal mechanism) bring clear evidence.
   *In the northern part of DBF, the sections BF_3 to BF_ 17 are ranked **class 4**, i.e. assumed or demonstrated to be inactive.
-On a theoretical basis, the evaluation of similarly oriented fault sections by different activity ranks may be justified by:
+On a theoretical basis, the evaluation of similarly oriented sections of DBF by different activity ranks may be justified by:
   -expected northward decrease of rate of stress build-up (and hence crustal strain rate), and
   -expected northward decrease of slip potential due to rotation of stress orientation near junction of the Alpine and the West-European stress domains.

Faults of the Bohemian Massif

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