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Magnitude Calibration for Vrancea (Romania) Subcrustal Earthquakes Using Coda Waves

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  • Olivia Bazacliu
  • Victoria Oancea
  • Emilia Popescu

Abstract

The coda wave amplitude is used to calibrate the moment–magnitude scale of the Vrancea (Romania) intermediate depth earthquakes. The proportionality between seismic moment and coda wave amplitude is supposed to infer a relation connecting the magnitude, the coda amplitude and the corresponding time in coda (measured from the origin time). The data set consists of waveforms recorded by the Romanian telemetered network at several seismic stations, such as Muntele Roşu (MLR), Vrâncioaia (VRI), Carcaliu (CFR) and Topalu (TLB). Our results are in good agreement with the moment–magnitude scale for Vrancea subcrustal events. The independence of the two approaches allows for the verification of the local magnitude scale for the Vrancea subcrustal earthquakes. Average relations among coda amplitude, magnitude M L and coda duration are obtained for the above-mentioned stations. Copyright Kluwer Academic Publishers 1999

Suggested Citation

  • Olivia Bazacliu & Victoria Oancea & Emilia Popescu, 1999. "Magnitude Calibration for Vrancea (Romania) Subcrustal Earthquakes Using Coda Waves," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 19(2), pages 179-187, May.
    • Handle: RePEc:spr:nathaz:v:19:y:1999:i:2:p:179-187
    DOI: 10.1023/A:1008024508584
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