A search for the slow initial phase generated by seismic events at a copper mine in Poland

• Autorzy: Kwiatek G.
• Języki publikacji: EN

Abstrakty

EN

Observation of seismic events induced by mining activity at the Rudna copper mine allowed to identify the occurrence of the Slow Initial Phase on the seismograms. A total of 4384 seismograms from 137 seismic events were analyzed. The seismic moment of the strongest event was 3.36x10(14) N.m and that of the smallest was 2.66x10(11) N.m. the Slow Initial Phase was noted on 182 seismograms, visiblein order to remove the influence as a gradual and extremely slow increase of the signal amplitude directly before the P-wave first arrival. This increase could be related to the attenuation of the signal propagating from the source to the receiver. In order to remove the influence of inelastic signal attenuation on the path from the source to the receiver, of the recording equipment and of other factors on the initial part of the seismograms of the analyzed events, numerous simulationswere carried out, allowing for appropriate corrections to the duration time of the Slow Initial Phase. These corrections did not have any significant impact on the final results, which leads to the conclusion that the Slow Initial Phase originates in the seismic source and is not effect related to the propagation of the wave from the source to the station.

Słowa kluczowe

EN

mine induced seismicity; slow initial phase

• Wydawca: Instytut Geofizyki PAN
• Czasopismo: Acta Geophysica Polonica
• Rocznik: 2003
• Tom: Vol. 51, nr 4
• Strony: 369--385
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Kwiatek G.

• Institute of Geophysics, Polish Academy of Sciences, ul. Księcia Janusza 64, 01-452 Warszawa Poland

Bibliografia

• 1. Abercrombie, R.E., 1995, Earthquake source scaling relationships from -1 to 5 Ml using seismograms recordedat 2.5-km depth, J. Geophys. Res. 100, 24015-24036.
• 2. Beroza, G.C., and W.L. Ellsworth, 1996, Properties of the seismic nucleation phase, Tectonophysics 261, 209-227.
• 3. Brune, J.N., 1971, Tectonic stress and seismic shear waves from earthquakes, J. Geophys. Res. 75, 4997-5009.
• 4. Domański, B., S.J. Gibowicz and P. Wiejacz, 2002, Source parameters of seismic events in a copper mine in Poland based on empirical Green 's functions. In: H. Ogasarawa, M. Ando and T. Yanagidani (eds.), "Seismogenic Process Monitoring", Balkema, Rotterdam, 75-89.
• 5. Ellsworth, W.L., and G.C. Beroza, 1998, Observation of the seismic nucleation phase in the Ridgecrest, California, earthquake sequence, Geophys. Res. Lett. 25, 3401-3404.
• 6. Futterman, W.L, 1962, Dispersive Body Waves, J. Geophys. Res. 67, 5279-5291.
• 7. Gladwin, M.T., and F.D. Stacey, 1974, Anelastic degradation of acoustic pulses in rock, Phys. Earth Planet. Int. 8, 332-336.
• 8. lio, Y., 1992, Slow initial phase of the P-wave velocity pulse generated by microearthquakes, Geophys. Res. Lett. 19, 477-480.
• 9. Iio, Y., 1995, Observations of the slow initial phase generated by microearthquakes: Implications for earthquake nucleation and propagation, J. Geophys. Res. 100, 15333-15349.
• 10. Ito, S., H. Ito, W.L. Ellsworth, S.G. Prejean, Y. Kuwahara and K. Imanishi, 2002, The slow initial phase of earthquakes in western Nagano, central Japan. In: H. Ogasarawa, M. Ando and T. Yanagidani (eds.), "Seismogenic Process Monitoring", Balkema, Rotterdam, 103-118.
• 11. Mori, J., and H. Kanamori, 1996, Initial rupture of earthquakes in the 1995 Ridgecrest, California sequence, Geophys. Res. Lett. 23, 2437-2440.
• 12. Sato, T., and T. Hirasawa, 1973, Body wave spectra from propagating shear cracks, J. Phys. Earth 21, 415-431.
• 13. Satoh, T., and the Research Group for semi-controlled earthquake-generation experiments in South African deep gold mines, 2002, Near source observation of small initial phase generated by earthquakes in a deep gold mine in South Africa. In: H. Ogasarawa, M. Ando and T. Yanagidani (eds.), "Seismogenic Process Monitoring", Balkema, Rotterdam.
• 14. Scherbaum, F., and M.P. Bouin, 1997, FIR filter effects and nucleation phases, Geophys. J. Int. 130, 661-668.
• 15. Shibazaki, B., and M. Matsu'ura, 1992, Spontaneous processes for nucleation, dynamic propagation and stop of earthquake rupture. Geophys. Res. Lett. 19, 1189-1192.
• 16. Singh, S.K., M. Ordaz, T. Mikumo, J. Pacheco, C. Valdes and P. Mandal, 1998, Implications of a composite source model and seismic-wave attenuation for the observed simplicity of small earthquakes and reported duration of earthquake initiation phase, Bull. Seism. Soc. Am. 88, 1171-1181.
• 17. Snoke, J.A., 1987, Stable determination of (Brune) stress drops, Bull. Seism. Soc. Am. 77, 530-538.
• 18. Umeda, Y., 1990, High-amplitude seismic waves radiated from the bright spot of an earth-quake, Tectonophysics 175, 81-92.
• 19. Umeda, Y., 1992, The bright spot of an earthquake, Tectonophysics 211, 13-22.
• 20. Yokota, T., S. Zhou, M. Mizoue and I. Nakamura, 1981, An automatic measurement of arrival time of seismic waves and its application to an online processing system, Bull. Earthquake Res. Inst. Univ. Tokyo 55, 449-484.