An investigation into the remote triggering of the Oita earthquake by the 2016 Mw 7.0 Kumamoto earthquake using full wavefield simulation

Miyazawa, Masatoshi

doi:10.1186/s40623-016-0585-z

Cited by 22 publications

(13 citation statements)

References 27 publications

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“…3 lies a remarkably conductive zone. In this case, the static stress change (e.g., Hardebeck et al 1998) caused by the 2016 Kumamoto earthquake was not effectively transferred at distance, but instead, the dynamic effects of seismic shaking were considered to be reasonable earthquake triggers (Miyazawa 2016). Because Seis.…”

Section: Discussionmentioning

confidence: 99%

Seismicity controlled by resistivity structure: the 2016 Kumamoto earthquakes, Kyushu Island, Japan

Aizawa

Asaue

Koike

et al. 2017

Earth Planets Space

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The M JMA 7.3 Kumamoto earthquake that occurred at 1:25 JST on April 16, 2016, not only triggered aftershocks in the vicinity of the epicenter, but also triggered earthquakes that were 50-100 km away from the epicenter of the main shock. The active seismicity can be divided into three regions: (1) the vicinity of the main faults, (2) the northern region of Aso volcano (50 km northeast of the mainshock epicenter), and (3) the regions around three volcanoes, Yufu, Tsurumi, and Garan (100 km northeast of the mainshock epicenter). Notably, the zones between these regions are distinctively seismically inactive. The electric resistivity structure estimated from one-dimensional analysis of the 247 broadband (0.005-3000 s) magnetotelluric and telluric observation sites clearly shows that the earthquakes occurred in resistive regions adjacent to conductive zones or resistive-conductive transition zones. In contrast, seismicity is quite low in electrically conductive zones, which are interpreted as regions of connected fluids. We suggest that the series of the earthquakes was induced by a local accumulated stress and/or fluid supply from conductive zones. Because the relationship between the earthquakes and the resistivity structure is consistent with previous studies, seismic hazard assessment generally can be improved by taking into account the resistivity structure. Following on from the 2016 Kumamoto earthquake series, we suggest that there are two zones that have a relatively high potential of earthquake generation along the western extension of the MTL.

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Section: Discussionmentioning

confidence: 99%

Seismicity controlled by resistivity structure: the 2016 Kumamoto earthquakes, Kyushu Island, Japan

Aizawa

Asaue

Koike

et al. 2017

Earth Planets Space

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“…Since Hill et al () first studied the dynamic earthquake triggering by the 1992 M 7.3 Landers earthquake, many such triggered events have been reported (e.g., Brodsky et al, ; Johnson & Bürgmann, ; Kilb et al, ; Miyazawa et al, ; Miyazawa, ; Parsons & Velasco, ; Richards‐Dinger et al, ; van der Elst & Brodsky, ; van der Elst et al, ; Yukutake et al, ). In one recent example, the 2016 M 7.3 Kumamoto earthquake triggered a M 5.7 event (semiofficial value, estimated by the Japan Meteorological Agency) during the passage of the seismic waves in the central part of Oita Prefecture, approximately 80 km from the mainshock (e.g., Miyazawa, , Uchida et al, , Yoshida, ). There have been relatively few reports of M > 5 earthquakes being remotely triggered during the passage of seismic waves from mainshocks (Lin, ; Pollitz et al, ).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Earthquake Triggering by Dynamic and Static Stress Changes Based on a Revised Friction Law

Yoshida

2018

JGR Solid Earth

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We conducted numerical simulations of earthquake triggering by assuming a circular asperity using a rate-and state-dependent friction law revised by Nagata et al. (2012, https://doi.org/10.1029. For a situation in which earthquakes occurred repeatedly, we applied dynamic sinusoidal stress perturbation. The stress perturbation caused an increase in slip velocity after the cessation of perturbation, and the resultant slip weakened the frictional strength. This leads to dynamic earthquake triggering for certain perturbation amplitudes. The following results were obtained. (1) Dynamic perturbations of long durations have high triggering potentials, whereas there is no significant frequency dependence because the potential is mainly determined by the total displacement due to the perturbation.(2) When a static stress jump is applied in addition to a dynamic perturbation, their combined effect on the triggering potential cannot be estimated by simply summing the applied stress amplitudes. A lower bound can be found by summing the logarithms of the velocity changes due to each individual perturbation. In addition, a nonlinear effect is required to explain the simulation results. (3) We evaluate the equivalent static stress jump that results in a triggering potential approximately the same as in the case of dynamic stress perturbation. (4) Even if the static stress change is negative, large dynamic stress perturbations can trigger earthquakes. (5) When stress perturbations are applied to stably sliding patches, dynamic triggering can occur under certain conditions. YOSHIDA 4109

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“…Miyazawa 2011; Yukutake et al 2011) and the 2016 M7.3 Kumamoto earthquake (e.g. Enescu et al 2016;Miyazawa 2016). In both cases, seismicity activation has been observed predominantly at volcanoes, although there were cases of triggered events associated with active faults.…”

Section: Introductionmentioning

confidence: 99%

“…Uchide et al 2016;Yagi et al 2016). It is important to remark that Miyazawa (2016), Uchide et al (2016) and Yoshida (2016) demonstrated the dynamic triggering initiation (by main shock body or surface waves) of seismicity at the Yufuin-Beppu region, where a M5.9 occurred at very short times after the main shock. The aftershock area following the 2016 M7.3 Kumamoto earthquake can be divided into three subareas, as shown in Fig.…”

Section: Relatively Short Durations and Fast Decay Of Aftershocks At mentioning

confidence: 99%

Triggering and decay characteristics of dynamically activated seismicity in Southwest Japan

Opris

Enescu

Yagi

et al. 2017

Geophysical Journal International

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S U M M A R YPrevious research revealed a dynamically triggered earthquake front propagating along Southwest Japan, in correlation with the arrival of surface waves from the 2011 M9.0 Tohoku-oki earthquake. However, some characteristics of the dynamically initiated seismic activation have not been investigated in detail. We analyse first the dynamic triggering process, using NIED waveform data. Our results suggest that at several triggering sites in SW Japan, including volcanic areas in Kyushu, the arrival of larger amplitude Love waves may correlate better with the occurrence of first locally triggered events compared to the Rayleigh wave arrivals. We also observe that triggering takes place during relatively long-period surface waves. We search for other cases of dynamic triggering in SW Japan by remote large earthquakes and show that the distinctive phase arrivals of both Love and Rayleigh waves from the 2008 M7.9 Wenchuan earthquake triggered local events in Kyushu. These observations suggest that sharing motion on well-lubricated local faults may have started failure in these areas. Based on the analysis of an extended earthquake catalogue, we find that the stacked seismicity for the dynamically triggered regions in SW Japan after the 2011 Tohoku-oki earthquake has a significant, albeit weak increase after the megathrust event, followed by a relatively slow decay towards the background level for the next several days. The relatively slow decay may reflect the temporal pattern of stacked, swarm-like clustered seismicity, which has been mainly activated at volcanic/geothermal areas in Kyushu. The decay of seismicity within a single, activated earthquake cluster may have, however, different characteristics. The analysis of the aftershocks initiated dynamically at the Yufuin-Beppu geothermal area (Kyushu), by the 2016 M7.3 Kumamoto earthquake, shows a fast decay that may reflect quick stress recovery near higher-temperature volcanic or geothermal regions.

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An investigation into the remote triggering of the Oita earthquake by the 2016 Mw 7.0 Kumamoto earthquake using full wavefield simulation

Cited by 22 publications

References 27 publications

Seismicity controlled by resistivity structure: the 2016 Kumamoto earthquakes, Kyushu Island, Japan

Seismicity controlled by resistivity structure: the 2016 Kumamoto earthquakes, Kyushu Island, Japan

Numerical Simulations of Earthquake Triggering by Dynamic and Static Stress Changes Based on a Revised Friction Law

Triggering and decay characteristics of dynamically activated seismicity in Southwest Japan

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