ET: micro-earthquakes and seismic noise

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Presentation transcript:

ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 ET: micro-earthquakes and seismic noise Gaetano De Luca and Wolfango Plastino National Institute of Nuclear Physics - Gran Sasso National Laboratory – ERMES Experiment Department of Physics “Edoardo Amaldi” – University of Roma Tre deluca@lngs.infn.it plastino@fis.uniroma3.it

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Introduction Estimation of seismic risk assessment Source and attenuation effects at local scale Seismic ground motion in an underground environment (Gran Sasso National Laboratory – National Institute of Nuclear Physics) G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Lazaro Cardenas G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 26th September, 1997 – 00:33 UT TIME (s) 26th September, 1997 – 00:33 UT TIME (s) G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 The spectral ratio method Oij - Fourier spectrum of a seismic signal Sij - source Pij - path Iij - instrument Rij - site where f is the frequency, j indicates the earthquake and i the station G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 The Nakamura’s method It consists in the evaluation of the spectral ratio between the horizontal and vertical component (H/V) The Coda-wave method Considering the Coda-waves in a time window centered at an elapsed time, measured from the origin time, which is at least twice the travel time of the S-waves, it is possible to disregard the effects of source radiation pattern and the travel path and to estimate the site transfer function for shear waves G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Spectral ratio at AQPK, CASC, GDIF, STAZ sites SPECTRAL RATIO FREQUENCY (Hz) CASC GDIF SANG-MUSE AQPK STAZ G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 H-V ratios at AQPK, CASC, GDIF, STAZ and SANG-MUSE sites CASC GDIF SANG-MUSE AQPK STAZ G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 [De Luca et al. (1998), Site response study in Abruzzo (central Italy): underground array versus surface stations , Journal of Seismology] G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 [De Luca et al. (1998), Site response study in Abruzzo (central Italy): underground array versus surface stations , Journal of Seismology] G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Underground array results for S-waves (bold lines) and noise (dashed lines): (a) spectral ratios between horizontal and vertical components; (b) spectral ratios between parallel (to the tunnel) and vertical components; (c) spectral ratios between transversal (to the tunnel) and vertical components [De Luca et al. (1998), Site response study in Abruzzo (central Italy): underground array versus surface stations , Journal of Seismology] G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 The observation of several seismograms indicates that the North-South component of motion is larger than East-West component, independently on source location and mechanism [De Luca et al. (1998), Site response study in Abruzzo (central Italy): underground array versus surface stations , Journal of Seismology] G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 LATITUDE NORTH (°) LONGITUDE EAST (°) © ERMES – INFN Roma Tre and LNGS G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Very slow-moving crustal strain disturbances Bella et al. (1990) – Tectonophysics Aquifer induced seismicity in the central Italy Bella et al. (1998) – Pure and Applied Geophysics Diffusion in porous media with memory Caputo and Plastino (2004) – Geophysical Journal International G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 Conclusions The obtained results confirm that the general trend of the spectral ratios for S-waves is quite uniform at different stations: almost flat for the entire band of frequency considered. As compared to the external stations there is still an amplification factor, in the frequency band 1–10 Hz. The comparison of the signals observed at the surface stations and the underground array show that free surface effects and mostly the resonance due to surface layers influence significantly the spectral shape, particularly for events at distances smaller than about 50 km. The observation of several seismograms indicates that the North-South component of motion is larger than East-West component, independently on source location and mechanism. G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise

G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise ET-ILIAS_GWA Joint Meeting Cascina, 25th November 2008 cm/s2 G. De Luca and W. Plastino – ET: micro-earthquakes and seismic noise