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Frequency analysis of the 2004 Sumatra-Andaman earthquake using spectral seismograms

Abstract

Frequency analysis of the Sumatra-Andaman earthquake of 2004, one of the most significant and best-recorded earthquakes, is based on spectral seismograms obtained from their broadband seismograms. The Sumatra-Andaman earthquake is found to have a wide-range frequency content of P-wave radiation during the rupturing process. On the basis of stacking spectral seismograms we distinguished four time events of the rupturing process of a total length of about 540 s. The frequency, f max, is the highest for the first event (0.163 Hz in time interval 0–88 s), lowest for the second — which is the strongest (0.075 Hz in time interval 88–204 s). For third and fourth events frequencies are similar (0.089 and 0.082 Hz in time intervals 204–452 and 452–537 s, respectively). The frequency also shows an azimuthal dependence (±0.02 Hz). Azimuths for which the frequency, f max, has maximum and minimum values are 203–222° and 23–42°, respectively. These observations are discussed in relation to previously published papers on this topic.

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Correspondence to Monika Wilde-Piórko.

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Wilde-Piórko, M., Duda, S.J. & Grad, M. Frequency analysis of the 2004 Sumatra-Andaman earthquake using spectral seismograms. Acta Geophys. 59, 483–501 (2011). https://doi.org/10.2478/s11600-011-0010-8

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Key words

  • Sumatra-Andaman earthquake
  • spectral seismograms kw]Butterworth filter