Studies on a new ESR signal (R signal) of fault gouges for fault dating

Hataya, Ryuta; Tanaka, Kazuhiro; Miki, Toshikatsu

doi:10.1016/s0277-3791(96)00091-1

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…12a, c, such phenomenon confirms the presence of the defect center. The defect center in quartz saturates easily at low microwave power as reported by Hataya et al [8]. However, at a relatively higher microwave power of 1 mW, the intensity of this peak is still visible indicating the presence of another signal which is most probably the C signal in carbonates (Fig.…”

Section: Discussionsupporting

confidence: 67%

“…In recognition of this importance, earth scientists have not only intensified but also refined on both spatial and temporal dimensions the characterization of faults and earthquake prone zones in Japan. As far as temporal characterization is concerned, quartz in fault gouges has been used to estimate the age of latest fault movements using the electron spin resonance (ESR) method [5–8]. The established ESR method reported by Ikeya et al [5] showed the possibility of dating young fault based on the presence of defect centers that are formed in quartz grains within fault gouges.…”

Section: Introductionmentioning

confidence: 99%

“…Among these defect centers, a paramagnetic center called (oxygen vacancy with one electron) center has been used extensively to characterize and date faults. However, ESR results gotten through this signal are unlikely because of the following reasons: this signal is usually associated with a counterfeit signal [7] and is also associated with another signal called the R signal which has a short spin lattice relaxation time [8]. Moreover, ages <10 ka have never been gotten in defect centers present in quartz grains in fault gouges.…”

Section: Introductionmentioning

confidence: 99%

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Electron Spin Resonance (ESR) Dating of Calcareous Fault Gouge of the Ushikubi Fault, Central Japan

2013

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The ages of fault events of active faults have been estimated using electron spin resonance (ESR) signals of siliceous gouges. This technique of ESR method is limited by obtaining only ages that are greater than tens of millennia. So this study focuses on developing a new technique of using calcareous gouges to gain an insight into the ages of latest seismogenic event within the Holocene. For the first time, signal B of the ESR method has been used to estimate the age of the Ushikubi fault from calcareous gouge. This technique proved reliable because the mean age (1.9 ka) obtained agrees with previous works on indirect age determination of latest fault events by utilizing radiocarbon dating in the study area. However, the result from the ESR technique showed an increase relative to the age of 1 ka that was obtained by the radiocarbon dating method. This disparity may be due to a high dose rate value of 50 Gy/h of artificial irradiation that was used to determine the equivalent dose (ED). Moreover, isochronal experiment revealed that the gouge did not comprise pure carbonates but consisted of a mixture of calcite and quartz grains. A younger age value would have been obtained if a lower artificial irradiation dose rate and a relatively pure carbonate fault gouge were used in the ED determination.

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Section: Discussionsupporting

confidence: 67%