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

Tajima, Reiko; Tajima, Fumiko

doi:10.1186/bf03353150

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…The aftershock activity in this earthquake sequence is extremely high when compared with that in other crustal earthquake sequences; the total M 0 release by the aftershocks reaches about 80 per cent of the main shock during the first few days (see Tajima & Tajima 2007, 2008). The aftershocks in this sequence seem to be clustered around each major fault (Fig.…”

Section: Discussionmentioning

confidence: 78%

Seismic structure in and around the source area of the 2004 mid-Niigata, Japan, earthquake: 3-D waveform modelling based on local tomography images

Tajima

Kato

2009

Geophysical Journal International

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S U M M A R YThe seismic velocity structure in and around the source area of the 2004 mid-Niigata earthquake, which featured complicated heterogeneities, was investigated by combining waveform modelling and traveltime tomography inversion using low-frequency (0.05 ≤ f ≤ 0.2 Hz) and high-frequency (f ≥ ∼1 Hz) data, respectively. On the footwall of the main shock that includes multiplanar faults, 3-D finite-difference waveform modelling using only a previously proposed tomography model was not sufficient to synthesize the observed waveforms in 0.05 ≤ f ≤ 0.2 Hz at most stations. Thus, we derived a final 3-D model 3DM-28, examining body wave amplitudes, phases and traveltimes. The image produced by model 3DM-28 shows a clearer contrast between low-and high-velocities than that seen in the original tomography models due to the higher velocity on the footwall. This increase in velocity, particularly in the seismogenic zone, also indicates that short-wavelength low-velocity anomalies revealed in the revised tomography image may be more localized in the vicinity of the multiplanar faults than that shown in the original one. Moreover, the low-velocity anomaly zone within a depth range of 15-20 km beneath the seismogenic zone (lower crust) appears to be associated with the short-wavelength low velocity anomalies at shallower depths (upper crust). These characteristics may support the hypothesis of infiltration of pressurized fluids from the lower crust into the multiplanar fault system. The volumes or distributions of such fluids may be clarified by further examination of 'unsatisfactory fit waveforms' recorded at stations along the strikes of the major faults. We suggest that the clear velocity contrasts between the hangingwall and footwall and the upper crust and lower crust, including the effects of fluids, all seem to be essential characteristics of the seismogenic conditions in this earthquake sequence.

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Section: Discussionmentioning

confidence: 78%

Seismic structure in and around the source area of the 2004 mid-Niigata, Japan, earthquake: 3-D waveform modelling based on local tomography images

Tajima

Kato

2009

Geophysical Journal International

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“…The source process of the mainshock was inferred from strong motionseismograms (Aoi et al, 2008). Other aspects of the earthquake have also been characterized: the earthquake sequence (Tajima and Tajima, 2008) and a paleosismic investigation of emerged wood blocks .…”

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confidence: 99%

Introduction to the special section on the 2007 Chuetsu-Oki, Niigata, Japan, Earthquake

Satō

2008

Earth Planet Sp

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Source Scaling of Inland Crustal Earthquake Sequences in Japan Using the S-Wave Coda Spectral Ratio Method

Somei¹,

Asano

Iwata

et al. 2014

Pure Appl. Geophys.

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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

Cited by 4 publications

References 25 publications

Seismic structure in and around the source area of the 2004 mid-Niigata, Japan, earthquake: 3-D waveform modelling based on local tomography images

Seismic structure in and around the source area of the 2004 mid-Niigata, Japan, earthquake: 3-D waveform modelling based on local tomography images

Introduction to the special section on the 2007 Chuetsu-Oki, Niigata, Japan, Earthquake

Source Scaling of Inland Crustal Earthquake Sequences in Japan Using the S-Wave Coda Spectral Ratio Method

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