Abstract
AbstractThe 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. TheM0-f0relation of this sequence (3.4 ≤Mw≤ 6.6) isM0∝fc−3.87, which deviates fromM0∝fc−3. The relatively large deviation fromfc−3may reflect the influence of fluids identified in tomographic studies around the source region of the tectonic strain concentration. Moreover, the lowerfcs 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.
Highlights
The 16 July 2007 Off Mid Niigata prefecture (Chuetsuoki) earthquake (OMNE) occurred in the central part of Japan about 40 km northwest of the 23 October 2004 Mid Niigata prefecture earthquake (MNE)
We showed variance in the grid search (0.8 ≤ f ≤ 7 Hz) for the spectral ratio of the main shock to each smaller aftershock in Table 1 to evaluate the uncertainty for the fcS determinations
OMNE sequence that occurred in a similar tectonic region to the 2004 MNE sequence
Summary
The 16 July 2007 Off Mid Niigata prefecture (Chuetsuoki) earthquake (OMNE) occurred in the central part of Japan about 40 km northwest of the 23 October 2004 Mid Niigata prefecture earthquake (MNE). The present study determines the fcs of the OMNE and the aftershocks (3.4 ≤ Mw ≤ 6.6) using the spectral ratio method (Tajima and Tajima, 2006, 2007) and compares the scaling relationships among the three earthquake sequences.
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