Active Fault Study in the 2000 Tottori-ken Seibu Earthquake Area

Inoue, Daisuke; Miyakoshi, Katsumi; Ueta, Keiichi; Miyawaki, Akiko; Matsuura, Kazuki

doi:10.4294/zisin1948.54.4_557

Cited by 14 publications

(14 citation statements)

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“…Although the difference between the two values is not small, I will tentatively take the average value of 1000 years as repeat times. The repeat times of the Tottori earthquake can be estimated to be 750-1200 years from the recent event revealed by a trenching study (Inoue et al, 2002). Comparison of the 2007 Noto Hanto earthquake with these two earthquakes suggests that the 2007 Noto Hanto earthquake has repeat times longer than 1000 years when taking into consideration that the repeat times become shorter as the ratio decreases (Kanamori, 1994).…”

Section: Discussionmentioning

confidence: 97%

Characterization of the 2007 Noto Hanto, Japan, earthquake

Horikawa

2008

Earth Planet Sp

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Characterization of the 2007 Noto Hanto, Japan, earthquake (M S 6.9), a moderate-size crustal event, was performed. The rupture process was firstly inferred from strong motion data. Inversion analysis revealed that the overall rupture finished within 6 s, and the seismic moment of this earthquake was estimated to be 1.1 × 10 19 N m (M w 6.6). Two areas of large slip and stress drop (asperities) were inferred on the fault plane. The maximum static stress drop calculated from the derived slip distribution exceeded 16 MPa for the major asperity, and the minor asperity has a similar maximum value. An area of negative stress drop corresponding to the distribution of small slip exists between the two asperities. This strongly suggests that the fault is segmented. A boundary between surface faults was located above the major asperity, but an area of negative stress drop appeared between the asperity and fault boundary. This suggests that the configuration of the surface faults reflects only a shallow part of the causative fault. The ratio of radiated energy to seismic moment was also estimated for the purpose of estimation of fault activity. Comparison of the derived value with those of other Japanese earthquakes suggests that the causative fault of the Noto Hanto earthquake is not very active.

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Section: Discussionmentioning

confidence: 97%

Characterization of the 2007 Noto Hanto, Japan, earthquake

Horikawa

2008

Earth Planet Sp

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“…9, event 4) was caused by a left-lateral slip along a fault trending about N145~ (Sagiya et al 2002). In this last case the fault that slipped is expressed at the surface not by a well-marked lineament but rather by a series of discontinuous fault segments trending N145~ along which streams and other topographic features are offset left-laterally (Inoue et al 2002).…”

Section: Plio-quaternary To Present-day Kinematicsmentioning

confidence: 99%

Distributed strike-slip faulting, block rotation and possible intracrustal vertical decoupling in the convergent zone of SW Japan

Fabbri

Iwamura

Matsunaga³

et al. 2004

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Between the Median Tectonic Line (MTL) and the Japan Sea, the western Chugoku region of SW Japan is cut by a series of N45~ first-order faults and oblique (N60~176 second-order faults. This fault network, probably formed during Late Cretaceous-Palaeocene times (70-60Ma), defines a regional block structure. PrePlio-Quaternary kinematical indicators suggest left-lateral motion along the first-order faults and right-lateral motion along some of the second-order faults. Geomorphological evidence and earthquake focal mechanisms indicate that Plio-Quaternary slip senses are opposite to Pre-Plio-Quatemary ones.The overall fault pattern is geometrically and kinematically similar to patterns obtained by experimental modelling of simple shear deformation distributed at the base of a brittle layer analogue over its entire width. This similarity suggests the possibility of a midcrustal, flat-lying partial attachment zone which could have controlled the formation of the western Chugoku fault network in Cretaceous to Palaeocene times. The zone, presently inactive, could correspond to the 'proto-MTL', a low-angle fault recently imaged by seismic reflection studies and whose trace approximately coincides with the present-day MTL. Reactivation of the system occurred twice after its formation: firstly in Miocene times, during the opening of the Japan Sea and concomitant clockwise rotation of the entire SW Japan arc; and secondly in Late Pliocene to Quaternary times, after a shift of the relative direction of convergence between the Philippine and Eurasia plates. Unlike the first reactivation, the second reactivation led to an inversion of the sense of slip along the faults.Wrench tectonics can be localized along a single strike-slip fault but can also be diffuse and encompass large areas whose widths can exceed several tens or hundreds of kilometres (e.g. Moore 1979). Diffuse wrench zones are composed of crustal blocks and slivers delimited by vertical faults. The mechanism of internal deformation of diffuse wrench zones typically involves vertical-axis rotations of blocks and concomitant strike-slip along the block-bounding faults, the so-called 'bookshelf' mechanism of Mandl (1987). Examples of analyses of internal deformation of diffuse wrench zones are numerous and often rely on palaeomagnetic investigations (Luyendyk et al.

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“…We suggest that the different resistivity structure reflects the different stage of fault development. Inoue et al (2002) pointed out that the distribution pattern of lineaments in the epicentral area of the 2000 Western Tottori earthquake is similar to the distribution pattern at the initial stage of fault development for the sandbox experiment (Ueta et al, 2000). Ueta et al (2000) showed, for a sinistral case, that right-stepping shears develop on both sides of the basement fault at the initial stage, with only small displacement, and that short-length shears develop discretely near the fault at this stage.…”

Section: Discussionmentioning

confidence: 71%

“…Fusejima et al (2001) found five surface fractures along NW-SE trending lines in an area 6 km long and 1 km wide. Inoue et al (2002) also found some NW-SE trending lineaments with a sinistral offset of valleys and ridges based on aerial photograph interpretation, geological inves- tigations and trenching studies in the aftershock zone. In both studies, these lineaments were interpreted as active faults because fault gouge and horizontal striations on sharp fault planes were found along the lineaments.…”

Section: Introductionmentioning

confidence: 80%

“…The fracture zones along the earthquake faults in the aftershock area have quite poor fault gouge belts and no cataclasite zones (Fusejima et al, 2002). Inoue et al (2002) stated strongly that these are immature faults based on the short fault lengths with narrow fracture zones. Their assessment is supported by the results of seismological studies that also suggest the immaturity of these faults.…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional resistivity structure of the fault associated with the 2000 Western Tottori earthquake

et al. 2007

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Two-dimensional resistivity surveys were carried out along two profiles that were laid across earthquake faults initiated by the 2000 Western Tottori earthquake. One profile was located 7 m from a trenching pit, thereby enabling a direct comparison of resistivity cross-section with the geological cross-section and, subsequently, a precise interpretation of the resistivity structure. Features of the resistivity cross-section were found to correspond fairly well to the geological cross-section. A clear resistivity boundary between the resistive and conductive zones matches the earthquake fault that was found by the trenching survey. Variations in resistivity depend primarily on the development of fractures. Two types of conductive zones were found: (1) a clear and deep-rooted conductor that corresponds to an earthquake fault and (2) an indistinct and spatially localized conductor that corresponds to a fracture attributed by landslides and collapse. A few weak conductive zones that match with discrete earthquake faults characterize our resistivity model. This feature is different from the resistivity cross-sections found at the Nojima and Ogura Faults that appeared at the time of the 1995 Hyogo-ken Nanbu earthquake; these two latter faults are characterized by distinct single conductive zones. Based on geomorphological, geological, and seismological evidence, the earthquake fault of the 2000 Western Tottori earthquake can be classified as an immature fault. In contrast, the Nojima and Ogura Faults have been active for at least the entire Quaternary period. We conclude that the difference in the fault development stages is reflected in their different resistivity structures.

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Active Fault Study in the 2000 Tottori-ken Seibu Earthquake Area

Cited by 14 publications

References 0 publications

Characterization of the 2007 Noto Hanto, Japan, earthquake

Characterization of the 2007 Noto Hanto, Japan, earthquake

Distributed strike-slip faulting, block rotation and possible intracrustal vertical decoupling in the convergent zone of SW Japan

Two-dimensional resistivity structure of the fault associated with the 2000 Western Tottori earthquake

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