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

Ariyoshi, Keisuke; Uchida, Naoki; Matsuzawa, Toru; Hino, Ryota; Hasegawa, Akira; Hori, Takane; Kaneda, Yasufumi

doi:10.1002/2014gl061872

Cited by 11 publications

(9 citation statements)

References 33 publications

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“…Thanks to the development of computational capabilities, numerical simulations of earthquake cycles based on rate-and state-dependent friction laws (RSF laws) (Dieterich, 1979;Ruina, 1983) are now a useful tool to understand complexities of fault slip. In particular, such models are useful to study the development of afterslip and its effect on driving aftershock sequences and triggering earthquakes (e.g, Kato, 2008;Ariyoshi et al, 2007aAriyoshi et al, , 2015Nakata et al, 2016). Relationships between aftershock seismicity rate and afterslip have been proposed in the framework of RSF models (e.g., Avouac, 2004, 2007).…”

Section: Introductionmentioning

confidence: 99%

Quantitative relationship between aseismic slip propagation speed and frictional properties

et al. 2019

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Recent observations show evidence of propagation of postseismic slip, which may contain information about the mechanical properties of faults. Here, we develop a new analytical relationship between the propagation speed of aseismic slip transients and fault frictional properties, modeled by a rate-and state-dependent friction law. The relationship explains the propagation speed of afterslip in 3-D numerical simulations to first order. Based on this relationship, we identify systematic dependencies of afterslip propagation speed on effective normal stress σ and frictional properties (the coefficients a and a-b which quantify the instantaneous and the steady-state velocity-dependence of friction, respectively, and the characteristic slip distance L of fault state evolution). Lower values of the parameter A=aσ cause faster propagation in areas where the passage of the postseismic slip front induces large shear stress changes Δτ compared to A, which are typically located near the mainshock rupture. In areas where Δτ/A is small, typically more distant from the mainshock, afterslip propagation speed is more sensitive to (a-b)σ. The propagation speed is proportional to initial slip velocity and, under the condition that loading span is significantly shorter than the passage of postseismic slip, inversely proportional to L. The relationship developed here should be useful to constrain the frictional properties of faults based on observed propagation speeds, independently of rock laboratory experiments, which can then be used in predictive numerical simulations of aseismic slip phenomena.

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Section: Introductionmentioning

confidence: 99%

Quantitative relationship between aseismic slip propagation speed and frictional properties

et al. 2019

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“…The epicentre of repeaters off Kamaishi is marked by a red star and the location of the Kamaishi mine is indicated by a black star (modified from ref. 34 ). The total slip distribution of slip greater than 5 m for the 2011 Tohoku-oki earthquake is also plotted, from Yagi and Fukuhata 16 and the epicentres of earthquakes (M > 5) in the Sanriku-oki low-seismicity region (SLSR), from Ye et al .…”

Section: Introductionmentioning

confidence: 99%

Stress buildup and drop in inland shallow crust caused by the 2011 Tohoku-oki earthquake events

Sakaguchi

Yokoyama

Lin

et al. 2017

Sci Rep

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To examine the change in stress between before and after the Tohoku-oki Mw9.0 earthquake, we performed stress measurements after the earthquake in the Kamaishi mine in Iwate prefecture in northern Japan, located near the northern termination of the mainshock rupture, following previous measurements before the earthquake in the same mine. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased after the mainshock and, at 1 year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time and returned to almost pre-earthquake levels at about 3 years after the earthquake. These changes can be interpreted in terms of coseismic rupture of the mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located. The drastic increase in stress suggests that the SLSR may act as a barrier to further rupture propagation.

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“…Repeating earthquakes are useful for understanding earthquake generation mechanisms, monitoring the local structural changes, and testing the earthquake predictability. Both the spatial distribution and temporal changes in their source processes have been revealed via analyses of repeating earthquakes (e.g., Okada et al, 2003;Ariyoshi et al, 2014). The earthquake repetition over a long period is used to estimate the spatiotemporal evolution of interplate aseismic slip (e.g., Igarashi, 2010;Kato et al, 2016) and test the earthquake predictability (e.g., Uchida and Bürgmann, 2019).…”

Section: Introductionmentioning

confidence: 99%

Catalog of small repeating earthquakes for the Japanese Islands

Igarashi

2020

Preprint

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Groups of repeating earthquakes, which occur in approximately the same location and possess a similar focal mechanism, have been extracted in various tectonic environments worldwide. Their recurrence interval has been used to estimate the spatiotemporal evolution of aseismic slip along major tectonic boundaries. Furthermore, slight changes between the waveforms of repeating earthquakes have been analyzed to delineate temporal changes in the local seismic velocity structure. Here we construct a long-term catalog of small repeating earthquakes in the central Japan since 1981 and throughout the Japanese Islands since 2001 (2001–2019) based on waveform similarity and relative source locations. Most of the long-duration sequences are located near the strongly coupled areas of the Philippine Sea and Pacific plates as they subduct from the Ryukyu-Nankai-Sagami and Kuril–Japan trenches, respectively. Many of the repeating sequences that occur in shallow crustal environments are short-lived. This repeating earthquake catalog allows us to estimate the slip history along each tectonic boundary. We believe that this and similar catalogs will be useful for future investigations of source processes, temporal slip and stress changes along faults, and local velocity structures, thereby providing new insights into earthquake generation mechanisms.

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

Cited by 11 publications

References 33 publications

Quantitative relationship between aseismic slip propagation speed and frictional properties

Quantitative relationship between aseismic slip propagation speed and frictional properties

Stress buildup and drop in inland shallow crust caused by the 2011 Tohoku-oki earthquake events

Catalog of small repeating earthquakes for the Japanese Islands

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