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Differential calibration of seismometers for measurement of rotation and strain

Wiszniowski J., Hościłowicz M., Skrzyński A., Suchcicki J., Teisseyre K. P.

Acta Geophysica

2008

Vol. 56, no. 2

391-407

A method of correcting the seismometers' responses discrepancy for differential measurements of strains and rotations in the seismic far field is proposed. The method concerns differential calibration of the whole seismometers' array by electric current. A model of corrective filtering of the obtained differential signals in the Z domain is given. Two methods of the filter parameters' estimation are introduced; they are based on the seismometers response to the calibration. A practical test of the methods - an analysis of a recorded seismic event - is added. Significant reduction of differences between simultaneous seismic recordings was obtained, which is interpreted as cleaning of differential signal from spurious elements.

Analysis of a group of seismic events using rotational components

Teisseyre K.P.

Acta Geophysica

2007

Vol. 55, no. 4

535-553

Analysis of a group of seismic events which took place in central Italy and have been recorded at the l’Aquila Observatory reveals proportionality between the maximum seismic signal (the displacement velocity) and the maximum amplitudes of rotational components. To compare the seismic events in the aspect of energy emitted as rotational motions, the rotation indices are used; these indices help us also to differentiate between the results obtained for different frequency spectra. In the adopted higher frequency range, 2.6-43 Hz, the relation between maximum displacement velocities and the rotation indices is roughly reciprocal, while for the lower frequencies, 0.3-3 Hz, there is no clear relationship. The share of rotation motions in the whole seismic energy emitted from the source varies during the seismic event. Research on the rotational components hidden in the seismic field gives a new insight into the processes in the source.