Fractal size and spatial distributions of fault zones: An investigation into the seismic Chelungpu Fault, Taiwan

Otsuki, Kenshiro; Uduki, Takayuki; Monzawa, Nobuaki; Tanaka, Hidemi

doi:10.1111/j.1440-1738.2004.00454.x

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Before we extrapolate the obtained fault data to the unsurveyed area, we have to confirm the constant scaling properties (fractal geometry) of faults are satisfied in the study area. Cello et al (2000) and Otsuki et al (2005) confirmed that the linear relationships between cumulative number and fault width in a range of 2-3 orders of magnitude on log-log diagrams, which indicating self-similar (scale independent) properties of the faults. The faults in the Inobuseyama area also show a linear relationship between cumulative fault number and fault width (Fig.…”

Section: Slip Rate In the Nktzsupporting

confidence: 61%

Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

Tamura

Oohashi

Otsubo

et al. 2020

Earth Planets Space

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Recent global navigation satellite system (GNSS) data for the Japanese Islands have revealed a high-strain-rate region suggesting the existence of a region of broad-scale crustal deformation. The Niigata-Kobe Tectonic Zone (NKTZ), which is the high-strain-rate zone in central Japan, shows a short-term dextral strain rate of ~ 12 mm/year. The total slip rate of the Quaternary fault zones in the NKTZ has been estimated as ~ 6.7 mm/year, accounting for just over half the short-term strain rate of the zone. However, this slip rate underestimates the total slip rate on faults within the NKTZ owing to possible distributed deformation on minor faults. This study quantifies the slip rate attributable to these other faults in the southeastern-central NKTZ and reveals the unique deformation structure across the highstrain-rate zone, which comprises a Quaternary fault core, a Quaternary fault damage zone, an incipient brittle shear zone (active background), and an inactive background. The spatial characteristics of the incipient brittle shear zone can be explained in terms of fault density, which increases toward the central NKTZ. Minor faults located > 500 m from major Quaternary faults but within the NKTZ have sense of shear consistent with that of the major faults. In contrast, minor faults outside of the NKTZ show sense of shear that differ from the dextral displacement of the high-strain-rate zone and do not contribute to the slip rate of the zone. The total slip rate of minor faults in the southeastern-central NKTZ is estimated to be 0.46-2.88 mm/year (roughly equal to a major Quaternary fault in the zone), which implies 4-24% of crustal strain is stored in the active background.

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Section: Slip Rate In the Nktzsupporting

confidence: 61%

Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

Tamura

Oohashi

Otsubo

et al. 2020

Earth Planets Space

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“…This value of P max is enough for the formation of the clayey veins. This process is discussed in greater detail in Otsuki et al . (2005).…”

Section: Implications Of Fault Rocks and Their Structures For Fault Smentioning

confidence: 99%

Clayey injection veins and pseudotachylyte from two boreholes penetrating the Chelungpu Fault, Taiwan: Their implications for the contrastive seismic slip behaviors during the 1999 Chi‐Chi earthquake

et al. 2005

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The seismic slip that occurred during the 1999 Chi-Chi earthquake in Taiwan showed contrastive behaviors in different regions along the Chelungpu Fault: A large and smooth slip occurred in the north, while a relatively small slip associated with highfrequency seismic wave radiation occurred in the south. The core samples from shallow boreholes at northern (Fengyuan) and southern (Nantou) sites penetrating the seismic Chelungpu Fault were analyzed. The fault zones at the northern site are characterized by soft clayey material associated with clayey injection veins. This suggests that the fault zones were pressurized during ancient seismic slip events, and hence the elastohydrodynamic lubrication occurred effectively. In contrast, the fault rock from the southern site is old pseudotachylyte that has been shattered by repeated ancient seismic slip events. Statistical analysis of many pseudotachylyte fragments reveals that the degree of frictional melting tended to be low. In this case, the seismic slip is restrained by the mechanical barrier of a highly viscous melt layer. These contrastive fault rocks were produced by repeated ancient seismic slip events, but the two corresponding mechanisms of friction are likely to have also occurred during the 1999 Chi-Chi earthquake, thus causing the contrastive slip behaviors in the north and south.

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Analyses of pseudotachylyte from Hole-B of Taiwan Chelungpu Fault Drilling Project (TCDP); their implications for seismic slip behaviors during the 1999 Chi-Chi earthquake

et al. 2009

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Fractal size and spatial distributions of fault zones: An investigation into the seismic Chelungpu Fault, Taiwan

Cited by 5 publications

References 22 publications

Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

Clayey injection veins and pseudotachylyte from two boreholes penetrating the Chelungpu Fault, Taiwan: Their implications for the contrastive seismic slip behaviors during the 1999 Chi‐Chi earthquake

Analyses of pseudotachylyte from Hole-B of Taiwan Chelungpu Fault Drilling Project (TCDP); their implications for seismic slip behaviors during the 1999 Chi-Chi earthquake

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