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Journal of Seismology

, Volume 17, Issue 2, pp 507–521 | Cite as

Earthquake source parameters and scaling relationships in Hungary (central Pannonian basin)

  • Bálint Süle
  • Zoltán Wéber
Original Article
  • 187 Downloads

Abstract

Fifty earthquakes that occurred in Hungary (central part of the Pannonian basin) with local magnitude \(M_\textrm{L}\) ranging from 0.8 to 4.5 have been analyzed. The digital seismograms used in this study were recorded by six permanent broadband stations and 20 short-period ones at hypocentral distances between 10 and 327 km. The displacement spectra for P- and SH-waves were analyzed according to Brune’s source model. Observed spectra were corrected for path-dependent attenuation effects using an independent regional estimate of the quality factor Q S . To correct spectra for near-surface attenuation, the κ parameter was calculated, obtaining it from waveforms recorded at short epicentral distances. The values of the κ parameter vary between 0.01 and 0.06 s with a mean of 0.03 s for P-waves and between 0.01 and 0.09 s with a mean of 0.04 s for SH-waves. After correction for attenuation effects, spectral parameters (corner frequency and low-frequency spectral level) were estimated by a grid search algorithm. The obtained seismic moments range from 4.21×1011 to 3.41×1015 Nm (1.7 ≤ M w  ≤ 4.3). The source radii are between 125 and 1,343 m. Stress drop values vary between 0.14 and 32.4 bars with a logarithmic mean of 2.59 bars (1 bar = 105 Pa). From the results, a linear relationship between local and moment magnitudes has been established. The obtained scaling relations show slight evidence of self-similarity violation. However, due to the high scatter of our data, the existence of self-similarity cannot be excluded.

Keywords

Spectral analysis Source parameters Moment magnitude Scaling relations κ parameter Hungary 

Notes

Acknowledgements

The reported investigation was financially supported by the Hungarian Scientific Research Fund (no. K68308). We are grateful to Georisk Ltd. for providing the waveform data recorded by the Paks Microseismic Monitoring Network. We also thank two anonymous reviewers for their valuable comments and constructive suggestions. Figures were prepared using the GMT software (Wessel and Smith 1998).

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Kövesligethy Radó Seismological ObservatoryMTA CSFK GGIBudapestHungary

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