Moderate Repeating Earthquakes off Kushiro, Eastern Hokkaido, Japan

Sakoi, Hisayuki; Matsuyama, Teruo; Hirayama, Tatsuya; Yamazaki, Iwao; Yamamoto, Takafumi; Ichiyanagi, Masayoshi; Takahashi, Hiroaki

doi:10.4294/zisin.65.151

Cited by 1 publication

(2 citation statements)

References 14 publications

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“…To perform trial simulations of the perturbed cycle of repeaters, we assume that the frictional coefficient μ obeys one of rate-and state-dependent friction (RSF) laws [Dieterich, 1979;Ruina, 1983],…”

Section: Numerical Modelmentioning

confidence: 99%

“…The plate interface is demarcated into five regions, as shown in Figure 1c: (i) large asperity (LA), (ii) small asperity (SA), (iii) transition zone (TZ), (iv) shallow stable zone (SS), and (v) deep stable zone (DS). The three different SAs along the strike direction (from LA) are defined as near (NSA), middle (MSA), and far distance asperity (FSA), with the same value of frictional instability σ(b À a)/d c [Ruina, 1983] because of the same depth. The values of the frictional parameters are the same between the three friction laws except the characteristic slip in LA (d c1 ) and SA (d c2 ) ( Figure 1d) to make the magnitude of the earthquakes occurring in LA and SA as similar as possible, which is discussed later.…”

Section: Numerical Modelmentioning

confidence: 99%

See 1 more Smart Citation

A trial estimation of frictional properties, focusing on aperiodicity off Kamaishi just after the 2011 Tohoku earthquake

Ariyoshi

Uchida

Matsuzawa

et al. 2014

Geophysical Research Letters

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Motivated by the fact that temporal earthquake aperiodicity was observed off Kamaishi just after the 2011 Tohoku earthquake, we performed numerical simulations of chain reactions due to the postseismic slip of large earthquakes by applying rate-and state-dependent friction laws. If the repeater is composed of single asperity, our results show that, (i) a mixture of partial and whole rupturing of a single asperity can explain some of the observed variability in timing and size of the repeating earthquakes off Kamaishi; (ii) the partial rupturing can be reproduced with moderate frictional instability with the aging-law and not the slip or Nagata laws; (iii) the perturbation of the activated earthquake hypocenters observed mostly in the ESE-WNW direction may reflect the fact that the large postseismic slip of the 2011 Tohoku earthquake propagated from ESE to WNW off Kamaishi; (iv) the observed region of repeating earthquake quiescence may reflect the strong plate coupling of megathrust earthquakes.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%