Near-Field Measurement of Six Degrees of Freedom Mining-Induced Tremors in Lower Silesian Copper Basin.

Krzysztof Fuławka,Bogumiła Pałac-Walko,Witold Pytel

doi:10.3390/s20236801

Abstract

The impact of seismicity on structures is one of the key problems of civil engineering. According to recent knowledge, the reliable analysis should be based on both rotational and translational components of the seismic wave. To determine the six degrees of freedom (6-DoF) characteristic of mining-induced seismicity, two sets of seismic posts were installed in the Lower Silesian Copper Basin, Poland. Long-term continuous 6-DoF measurements were conducted with the use of the R-1 rotational seismometer and EP-300 translational seismometer. In result data collection, the waveforms generated by 39 high-energy seismic events were recorded. The characteristic of the rotational component of the seismic waves were described in terms of their amplitude and frequency characteristics and were compared with translational measurements. The analysis indicated that the characteristic of the rotational component of the seismic wave differs significantly in comparison to translational ones, both in terms of their amplitude and frequency distribution. Also, attenuation of rotational and translational components was qualitatively compared. Finally, the empirical formulas for seismic rotation prediction in the Lower Silesian Copper Basin were developed and validated.

Highlights

Measurements of rotational ground motions have recently been one of the most examined branches of seismology
The preliminary 6-DOF measurements in the Lower Silesian Copper Basin (LSCB) were conducted in the Rudna mining area, which is recently characterized by high seismicity (Figure 3)
Results obtained at site number 1 are scattered significantly around the trend lines, but a clear dependence between peak values of rotational velocity and reduced distance may be observed

Summary

Introduction

Measurements of rotational ground motions have recently been one of the most examined branches of seismology. The theoretical formulas describing ground rotations about three Cartesian axes on the ground surface were developed [4,5,6]. As it was mentioned in numerous research [3,7,8,9], rotational seismology has become an emerging topic for study in many fields of science. Increasing interest in the new field of geophysics translated into the rapid development of systems for measuring rotational components of ground motion. At the same time most commonly used, devices are liquid-based Rotational seismometers R-1 and

Methods

Results

Discussion

Conclusion