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Site effects Estimation and Source_Scaling Dynamics for Local Earthquakes at Mt. Vesuvius, Italy
Author(s)
Type
Conference paper
Language
English
Status
Unpublished
Issued date
August 30, 2006
Conference Location
Grenoble, France
Keywords
Abstract
Local microearthquakes were used to estimate site effects and source
dynamic-scaling characteristics at Mt. Vesuvius, Italy. The selected data set is composed
of low magnitude events (1.1 £ Md £ 3.6) recorded in 1996 and 1999 by nine digital shortperiod
(1-Hz) seismic stations. Site response was evaluated by analysing data with three
different approaches: 1) spectral ratios method of S-waves with respect to the average
amplitude spectrum; 2) generalized inversion for site and source from the S-waves; and 3)
generalized inversion from the coda waves. The results obtained with all three methods
showed amplification of a factor of 1.5-2.5 in the 8-14 Hz frequency band for BKE and
SGV sites and an amplification of 3 in a narrow band around 8 Hz for the CDT site.
Method 2 allowed simultaneous determination of the source spectral shape for each
earthquake. By assuming an w2 source model, we estimated the seismic moment Mo and
corner frequency fc. The results show that most of the selected earthquakes are
characterized by stress drops of 10 bars. The present results are encouraging for further
investigation into the techniques for site-effect evaluation and for improving our knowledge
of the scaling law of the source spectrum at Mt. Vesuvius.
dynamic-scaling characteristics at Mt. Vesuvius, Italy. The selected data set is composed
of low magnitude events (1.1 £ Md £ 3.6) recorded in 1996 and 1999 by nine digital shortperiod
(1-Hz) seismic stations. Site response was evaluated by analysing data with three
different approaches: 1) spectral ratios method of S-waves with respect to the average
amplitude spectrum; 2) generalized inversion for site and source from the S-waves; and 3)
generalized inversion from the coda waves. The results obtained with all three methods
showed amplification of a factor of 1.5-2.5 in the 8-14 Hz frequency band for BKE and
SGV sites and an amplification of 3 in a narrow band around 8 Hz for the CDT site.
Method 2 allowed simultaneous determination of the source spectral shape for each
earthquake. By assuming an w2 source model, we estimated the seismic moment Mo and
corner frequency fc. The results show that most of the selected earthquakes are
characterized by stress drops of 10 bars. The present results are encouraging for further
investigation into the techniques for site-effect evaluation and for improving our knowledge
of the scaling law of the source spectrum at Mt. Vesuvius.
References
Aki, K. and B. Chouet (1975). Origin of coda waves: source, attenuation and scattering effect. Journal of
Geophysical Research 80, 3322-3342.
Bonilla, L. F., H. J. Steidl, G. T. Lindley, A. G. Tumarkin and R. Archuleta (1997). Site amplification in the
San Fernando Valley, California: Variability of the Site effect Estimation Using the S-Wave, Coda and H/V
methods. Bulletin of Seismological Society of America 87 (3), 710-730.
Bianco, F., M. Castellano, E. Del Pezzo and J. M. Ibanez (1999). Attenuation of short period seismic waves
at Mt. Vesuvius, Italy. Geophysical Journal International 138, 67-76.
Borcherdt, R. D. (1970). Effects of local geology on ground motion near San Francisco Bay. Bulletin of
Seismological Society of America 60, 29-61.
Brune, J. N. (1970). Tectonic stress and seismic shear waves from earthquakes. Journal of Geophysical
Research 75, 4997-5009.
Del Pezzo, E., G. De Natale, M. Martini, A. Zollo (1987). Source parameters of microearthquakes at
Phlegraean Fields (Southern Italy) volcanic area. Physics of the Earth and Planetary Interiors 47, 25-42.
Del Pezzo, E., S. De Martino, M.T. Parrinello, C. Sabbarese (1993). Seismic site amplification factors in
Campi Flegrei, Southern Italy. Physics of the Earth and Planetary Interiors 78, 105-117.
Del Pezzo, E., F. Bianco, G. Saccorotti (2004). Seismic source dynamics at Vesuvius volcano, Italy. Journal
of Volcanology and Geothermal Research 133, 23-39.
Drouet, S., A. Souriau, F. Cotton (2005). Attenuation, Seismic Moments and Site Effects for Weak Motion
Events: Application to Pyrenees. Bulletin of Seismological Society of America 95 (5), 1731-1748.
Field, E. H., K. H. Jacob (1995). A comparison and test at various site-response estimation techniques
including three that are not reference site-dependent. Bulletin of Seismological Society of America 85, 1127-
1143.
Hartzell, S. H. (1992). Site Response Estimation from Earthquake Data. Bulletin of Seismological Society of
America 82 (6), 2308-2327.
Jin, A., C.A. Moya, M. Ando (2000). Simultaneous Determination of Site Response and Source parameters
of Small Earthquakes along the Atotsugawa Fault Zone, Central Japan. Bulletin of Seismological Society of
America, 90 (6), 1430-1445.
Lachet, C., D. Hatzfeld, P. Bard, N. Theodulidis, C. Papaioannou and A. Savvaidis (1996). Site Effect and
Microzonation in the City of Thessaloniky (Greece). Comparison of Different Approaches. Bulletin of
Seismological Society of America 86 (6), 1692-1703.
Lay, T., and T. C. Wallace. Modern Global Seismology. Academic Cambridge Press, London, 1995.
Margheriti, L., L. Wennerberg, J. Boatwright (1994). A comparison of coda and S-wave spectral ratio
estimates of site response in the southern San Francisco Bay area. Bulletin of Seismological Society of
America 84, 1815-1830.
Milana, G., S. Barba, E. Del Pezzo, E. Zambonelli (1996). Site response from ambient noise measurements:
new perspectives from an array study in central Italy. Bulletin of Seismological Society of America 86, 320-
328.
Parolai, S., D. Bindi, L. Troiani (2001). Site response for the RSM Seismic Network and Source Parameters
in the Central Appenines (Italy). Pure and Applied Geophysics 158, 695-715.
Scarpa, R., F. Tronca, F. Bianco, E. Del Pezzo (2002). High Resolution velocity structure beneath Mount
Vesuvius from seismic array data. Geophysics Research Letters 29, 2040.
Tsujura,M. (1978). Spectral analysis of coda waves from local earthquakes. Bulletin Earthquake Research
Institute, Tokyo University, 53, 1-48.
Geophysical Research 80, 3322-3342.
Bonilla, L. F., H. J. Steidl, G. T. Lindley, A. G. Tumarkin and R. Archuleta (1997). Site amplification in the
San Fernando Valley, California: Variability of the Site effect Estimation Using the S-Wave, Coda and H/V
methods. Bulletin of Seismological Society of America 87 (3), 710-730.
Bianco, F., M. Castellano, E. Del Pezzo and J. M. Ibanez (1999). Attenuation of short period seismic waves
at Mt. Vesuvius, Italy. Geophysical Journal International 138, 67-76.
Borcherdt, R. D. (1970). Effects of local geology on ground motion near San Francisco Bay. Bulletin of
Seismological Society of America 60, 29-61.
Brune, J. N. (1970). Tectonic stress and seismic shear waves from earthquakes. Journal of Geophysical
Research 75, 4997-5009.
Del Pezzo, E., G. De Natale, M. Martini, A. Zollo (1987). Source parameters of microearthquakes at
Phlegraean Fields (Southern Italy) volcanic area. Physics of the Earth and Planetary Interiors 47, 25-42.
Del Pezzo, E., S. De Martino, M.T. Parrinello, C. Sabbarese (1993). Seismic site amplification factors in
Campi Flegrei, Southern Italy. Physics of the Earth and Planetary Interiors 78, 105-117.
Del Pezzo, E., F. Bianco, G. Saccorotti (2004). Seismic source dynamics at Vesuvius volcano, Italy. Journal
of Volcanology and Geothermal Research 133, 23-39.
Drouet, S., A. Souriau, F. Cotton (2005). Attenuation, Seismic Moments and Site Effects for Weak Motion
Events: Application to Pyrenees. Bulletin of Seismological Society of America 95 (5), 1731-1748.
Field, E. H., K. H. Jacob (1995). A comparison and test at various site-response estimation techniques
including three that are not reference site-dependent. Bulletin of Seismological Society of America 85, 1127-
1143.
Hartzell, S. H. (1992). Site Response Estimation from Earthquake Data. Bulletin of Seismological Society of
America 82 (6), 2308-2327.
Jin, A., C.A. Moya, M. Ando (2000). Simultaneous Determination of Site Response and Source parameters
of Small Earthquakes along the Atotsugawa Fault Zone, Central Japan. Bulletin of Seismological Society of
America, 90 (6), 1430-1445.
Lachet, C., D. Hatzfeld, P. Bard, N. Theodulidis, C. Papaioannou and A. Savvaidis (1996). Site Effect and
Microzonation in the City of Thessaloniky (Greece). Comparison of Different Approaches. Bulletin of
Seismological Society of America 86 (6), 1692-1703.
Lay, T., and T. C. Wallace. Modern Global Seismology. Academic Cambridge Press, London, 1995.
Margheriti, L., L. Wennerberg, J. Boatwright (1994). A comparison of coda and S-wave spectral ratio
estimates of site response in the southern San Francisco Bay area. Bulletin of Seismological Society of
America 84, 1815-1830.
Milana, G., S. Barba, E. Del Pezzo, E. Zambonelli (1996). Site response from ambient noise measurements:
new perspectives from an array study in central Italy. Bulletin of Seismological Society of America 86, 320-
328.
Parolai, S., D. Bindi, L. Troiani (2001). Site response for the RSM Seismic Network and Source Parameters
in the Central Appenines (Italy). Pure and Applied Geophysics 158, 695-715.
Scarpa, R., F. Tronca, F. Bianco, E. Del Pezzo (2002). High Resolution velocity structure beneath Mount
Vesuvius from seismic array data. Geophysics Research Letters 29, 2040.
Tsujura,M. (1978). Spectral analysis of coda waves from local earthquakes. Bulletin Earthquake Research
Institute, Tokyo University, 53, 1-48.
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