Analysis of a group of seismic events using rotational components

Czasopismo : Acta Geophysica
Tytuł artykułu : Analysis of a group of seismic events using rotational components

Autorzy :
Błęcki, J.
Space Research Centre, Polish Academy of Sciences, Warszawa, Poland, jblecki@cbk.waw.pl,
Chukwuma, V.U.
Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria, victorchukwuma@yahoo.com,
Krankowski, A.
Institute of Geodesy, University of Warmia and Mazury in Olsztyn, Poland, kand@uwm.edu.pl,
Abdullah, M.
Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia, mardina@eng.ukm.my,
Zakharenkova, I.E.
West Department of IZMIRAN, Kaliningrad, Russia, zakharenkova@mail.ru,
Teisseyre, K.P.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, kt@igf.edu.pl,
Abstrakty : 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.

Słowa kluczowe : seismic rotation waves, rotation seismograph system,
Wydawnictwo : Instytut Geofizyki PAN
Rocznik : 2007
Numer : Vol. 55, no. 4
Strony : 535 – 553
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DOI :
Cytuj : Błęcki, J. ,Chukwuma, V.U. ,Krankowski, A. ,Abdullah, M. ,Zakharenkova, I.E. ,Teisseyre, K.P. , Analysis of a group of seismic events using rotational components. Acta Geophysica Vol. 55, no. 4/2007
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