Analysis of a group of seismic events using rotational components |
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Authors: | Krzysztof P Teisseyre |
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Institution: | (1) Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland |
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Abstract: | 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. |
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Keywords: | seismic rotation waves rotation seismograph system |
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