pure and applied geophysics

, Volume 126, Issue 1, pp 37–53 | Cite as

Scaling of peak ground motions from digital recordings of small earthquakes at Campi Flegrei, southern Italy

  • Giuseppe De Natale
  • Ezio Faccioli
  • Aldo Zollo
Article

Abstract

The dependence of peak ground acceleration and velocity on seismic moment is studied for a set of small earthquakes (0.7<ML<3.2) recorded digitally at distances of a few km in the Campi Flegrei volcanic area near Naples, Italy, during the ground uplift episode of 1982–1984. Numerical simulations, using the ω-square spectral model with constant stress drop and ane−πkf high frequency decay, fit well both the velocity and acceleration data for an averagek=0.015. The observed ground motions in the 1–24 Hz frequency band appear to consist of radiation from simple sources modified only slightly by attenuation effects. Moreover, the scaling of peak values agrees closely with those determined in nonvolcanic areas, once the difference in stress drop is taken into account.

Key Words

scaling of peak ground motions volcanic microearthquakes source parameters high frequency attenuation 

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References

  1. Anderson, J. G. (1986),Implications of attenuation for studies of the earthquake source. InEarthquake source mechanics. Geophys. Monograph37 (A.G.U., Washington 1986), 311–318.Google Scholar
  2. Anderson, J. G. andHough, S. (1984),A model for shape of the Fourier amplitude spectrum of acceleration at high frequencies. Bull. Seism. Soc. Am.74, 1969–1994.Google Scholar
  3. Boore, D. M. (1983),Stochastic simulation of high frequency ground motions based on seismological models of the radiated spectra. Bull. Seism. Soc. Am.73, 1865–1894.Google Scholar
  4. Boore, D. M. (1986),The effect of finite bandwidth on seismic scaling relationships. InEarth source mechanics. Geophys. Monograph37 (A.G.U., Washington 1986), 275–284.Google Scholar
  5. Boore, D. M. andBoatwright, J. (1984),Average body-wave radiation coefficient. Bull. Seism. Soc. Am.74, 1615–1621.Google Scholar
  6. Brune, J. N. (1970),Tectonic stress and the spectra of seismic shear waves. J.G.R.75, 4997–5009 (1971, Correction, JGR, 76,5002).Google Scholar
  7. Del Pezzo, E., De Natale, G., Scarcella, G. andZollo, A. (1985),Q c of three component seismograms of volcanic microearthquakes at Campi Flegrei volcanic area, Southern Italy. PAGEOPH123, 683–696.Google Scholar
  8. Del Pezzo, E., De Natale, G., Martini, M. andZollo, A. (1987),Source parameters of microearthquakes at Phlegraean Fields (Southern Italy) volcanic area. Phys. Earth Pla. Int. 47, 25–42.Google Scholar
  9. De Natale, G., Madariaga, R., Scarpa, R. andZollo, A. (1987),Source parameter analysis from strong motion records of the Friuli (Italy) earthquake sequence (1976–1977). Bull. Seism. Soc. Am. 77, 1127–1146.Google Scholar
  10. De Natale, G. andZollo, A. (1986),Statistical analysis and clustering features of the Phlegraean Fields earthquake sequence (May 1983–May 1984). Bull. Seism. Soc. Am.76, 801–814.Google Scholar
  11. Faccioli, E. (1986),A study of strong motion from Italy and Yugoslavia, in terms of gross source properties. InEarthquakes source mechanics. Geophys. Monograph37 (A.G.U., Washington 1986), 297–309.Google Scholar
  12. Fletcher, J. (1980),Spectra from high dynamic range digital recordings of Oroville, California, aftershocks and their source parameters. Bull. Seism. Soc. Am.70, 735–755.Google Scholar
  13. Fletcher, J. Haar, L., Hanks, T. Vernon, F., Berger, J. andBrune, J. (1985),The digital array at Anza, California: processing and initial interpretation of source parameters. Presented at the 5th Ewing Symposium on Earthquake Source Mechanics, Harriman, New York, May 20–24.Google Scholar
  14. Hanks, T. andMcGuire, R. (1981),The character of high frequency strong motion. Bull. Seism. Soc. Am.71, 2071–2095.Google Scholar
  15. Luco, J. E. (1985),On strong ground motion estimates based on models of the radiated spectrum. Bull. Seism. Soc. Am.75, 641–650.Google Scholar
  16. McGarr, A. (1986),Some observations indicating complications in the nature of earthquake scaling. InEarth source mechanics. Geophys. Monograph37 (A.G.U., Washington 1986), 217–225.Google Scholar
  17. McGarr, A., Mueller, C., Fletcher, J. andAndrews, A. (1986),Ground motion and source parameters of the 1983 Coalinga, California earthquake sequence. U.S. Geol. Survey Prof. Pap. (in press).Google Scholar
  18. Powell, L. (1983),Engineering description of the U.W. portable digital seismograph. Proceedings of the Workshop on portable digital seismograph development, IASPEI meeting, Los Altos, California.Google Scholar
  19. Rovelli, A. (1983),Frequency relationship for seismic Qof central — Southern Italy from accelerograms for the Irpinia earthquake (1980). Phys. Earth Pla. Int.32, 209–217.Google Scholar

Copyright information

© Birkhäuser Verlag 1988

Authors and Affiliations

  • Giuseppe De Natale
    • 1
  • Ezio Faccioli
    • 2
  • Aldo Zollo
    • 1
  1. 1.Osservatorio VesuvianoNapoliItaly
  2. 2.Department of Structural EngineeringPolitecnicoMilanoItaly

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