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Seismic scaling relation of the 2007 Off Mid Niigata, Japan, earthquake (Mw 6.6) sequence in comparison with two other earthquake (Mw 6.6) sequences

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Abstract

The relationship of seismic moment (M0) to corner frequency (fc) of the 2007 Off Mid Niigata prefecture (Chuetsu-oki) earthquake sequence is examined in comparison with that of two other earthquake sequences. The M0-f0 relation of this sequence (3.4 ≤ Mw ≤ 6.6) is M0 f c −3.87 , which deviates from M0 f c −3 . The relatively large deviation from f c −3 may reflect the influence of fluids identified in tomographic studies around the source region of the tectonic strain concentration. Moreover, the lower fcs of the small events (3.4 ≤ Mw ≤ 3.8) in this sequence are similar to those of off-main-fault events in the 2004 Mid Niigata prefecture earthquake sequence. The characteristics in the scaling relation may be interpreted in the context of the event locations, which are either on- or off-main faults, and may have implications for the seismogenic conditions. Key words: The 2007 Off Mid Niigata earthquake, seismic scaling, seismogenic conditions.

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Correspondence to Reiko Tajima.

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Tajima, R., Tajima, F. Seismic scaling relation of the 2007 Off Mid Niigata, Japan, earthquake (Mw 6.6) sequence in comparison with two other earthquake (Mw 6.6) sequences. Earth Planet Sp 60, 1137–1141 (2008) doi:10.1186/BF03353150

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Key-words

  • The 2007 Off Mid Niigata earthquake
  • seismic scaling
  • seismogenic conditions