## 3 Results and Discussion
### Comparison of Vibration Impact Using SWD Scales  
To assess vibrations transmitted through the ground to buildings, the current standard in Poland is PN-B-02170:2016-12 [20]. An approximate characterization of the harmfulness of vibrations, according to the standard, can be presented using the dynamic impact scales SWD I and SWD II. These are nomograms (velocity or acceleration versus vibration frequency), allowing for a quick assessment of the degree of harmfulness of recorded vibrations after plotting measurement results. In the evaluation using SWD scales, full vibration waveforms of horizontal components, i.e., in the x and y directions recorded at the measuring point from the source side, at a rigid structural node--intersecting load-bearing walls in two directions--located at the building's foundation or at a rigid node on the floor of the underground level in the level of the surrounding terrain, should be used. These waveforms should be analyzed in third-octave bands, obtaining maximum values of acceleration or velocity in each band. To assess the impact of vibrations using SWD scales, registrations of full waveforms of horizontal components x and y are required. The analysis of full waveforms x and y is performed by filtering the signal with a third-octave filter. The resulting values, as a histogram of maximum velocity values in a given frequency band, are plotted on the SWD scales, assigning them the corresponding effects in a given zone. This is a method of analysis based on which, in the case of short-term (impulsive) vibrations, a final assessment  
Figure 12: Frequency structure of vibrations—blasting works; seismogram in Figure 7.  
Figure 13: Frequency structure of vibrations—underground mine tremors; seismogram in Figure 8.  
The zones of influence have the following interpretation (PN-B-02170: 2016-12): \begin{tabular}{l l l} zone I & - & vibrations negligible in the evaluation of the impact of vibrations on \\  & & the building, \\ line A & - & a lower limit for taking into account dynamic influences on the building; for \\  & & vibrations below this limit, dynamic influences may not be taken into account, \\ zone II & - & vibrations harmless to the structure; However, accelerated wear of the building \\  & & and the first scratches in plaster, wall corners and facets, etc., can be expected, \\ line B & - & limit of building stiffness, a lower limit of the formation of scratches and \\  & & cracks in structural elements, \\ zone III & - & vibrations harmful to the building, causing local scratches and cracks, thus \\  & & weakening the building structure and reducing its load-bearing capacity and \\  & & resistance to further dynamic influences; plaster may fall off, scratches may \\  & & appear on the joints of structural elements, etc., \\  & & line C & - \\  & & strength limit of individual building elements, a lower limit of heavy \\  & & construction damage, \\ zone IV & - & vibrations which are highly harmful to the building, pose a threat to people's safety; numerous cracks appear, as well as local damage to walls and other \\  & & individual structural elements of the building; there is a possibility of \\  & & suspended objects falling, ceilings sheets falling off, cornices falling off, roof \\  & & tiles falling, roof beams slipping out of bearings, etc.; required to remove the \\  & & source of vibrations as quickly as possible or reduce its influence, \\ line D & - & structure stability limit, a lower limit of failure of the entire building; \\  & & vibrations above this limit may cause a building failure and endanger the \\  & & safety of human life, \\ zone V & - & vibrations cause the building to fail due to collapsing walls, falling ceilings etc., \\  & & a full threat to the safety of human life; if there is a risk of vibrations, this type \\  & & of building must not be used. \\ \end{tabular}