Control Factors of Spatial Variation of Long-Period Strong Ground Motions in the Yufutsu Sedimentary Basin, Hokkaido, during the Mw 8.0 2003 Tokachi-oki, Japan, Earthquake

Hatayama, Ken; Kanno, Tatsuo; Kudo, Kazuhiko

doi:10.1785/0120060200

Cited by 30 publications

(15 citation statements)

References 13 publications

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“…First, we examined the underground V s structure at HKD126 with the observed phase velocity from the SPAC and MASW methods. The observed phase velocities were compared with the theoretical phase velocities for existing V s structures [Hatayama et al (2007), AIST, and J-SHIS V2 models]. The phase velocity of the Hatayama et al (2007) model which was estimated to simulate the 7-8 s period ground motions during the 2003 Tokachi-oki earthquake accurately explains the observed data (Fig.…”

Section: Figmentioning

confidence: 85%

“…There are existing models for this area: the Japan Seismic Hazard Information Station (Fujiwara et al 2012) version 2 model (J-SHIS V2), the Geological Survey of Japan, the National Institute of Advanced Industrial Science and Technology (AIST) model (Yoshida et al 2007), and the Hatayama et al (2007) model. First, we examined the underground V s structure at HKD126 with the observed phase velocity from the SPAC and MASW methods.…”

Section: Figmentioning

confidence: 99%

“…8). Therefore, we inserted a 400 m/s layer (assuming the engineering bedrock) and used the V s model of Hatayama et al (2007) in the higher velocity part (over 400 m/s). Furthermore, we added a shallower layer to explain the 1-s period amplification referring, to the soil column of HKD126.…”

Section: Figmentioning

confidence: 99%

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Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Takai¹,

Shigefuji²,

Horita³

et al. 2019

Earth Planets Space

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We investigated the cause of destructive ground motion during the 2018 Hokkaido eastern Iburi earthquake. We conducted strong motion observations of aftershocks and microtremors and the surface wave method in the damaged areas of the town of Mukawa, Hokkaido prefecture, Japan. The ground accelerations were continuously recorded during a period of approximately 3 months after the main shock on September 6, 2018. The heavily damaged buildings were mainly situated around the strong motion station (HKD126) in Mukawa town. Such concentration of damage can be explained by the strong power that was observed in the 1-2 s period of the response spectrum at this station. We estimated the S-wave velocity profiles of this station site and a temporary station site that was installed on a nearby hill. The estimated S-wave velocity, which was inverted from phase velocity structures with the microtremor array and the surface wave method observations explained the difference in the SH-wave amplification characteristics between the two sites. An analysis of HKD126 and the temporarily observed records clearly indicates the strong effects of the local geological conditions on the heavily damaged area of Mukawa. The strong ground motion power generated during the main shock in Mukawa for 1-2 s period was mainly amplified by this shallow underground velocity structure. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Figmentioning

confidence: 85%

Section: Figmentioning

confidence: 99%

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Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Takai¹,

Shigefuji²,

Horita³

et al. 2019

Earth Planets Space

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“…[35] The importance of the interaction between the basin and subbasin responses has been demonstrated qualitatively using 2-D numerical simulations [e.g., Kawase and Aki, 1989;Graves, 1995;Hatayama et al, 2007]. Our 3-D FD simulations provide quantitative evidence that a combination of the basin and subbasin responses is essential in understanding the disastrous long-period ground motions that occurred in the Yufutsu basin during the 2003 Tokachioki earthquake.…”

Section: Discussion Of the Basin And Subbasin Responsesmentioning

confidence: 73%

Three‐dimensional finite difference simulation of long‐period ground motions for the 2003 Tokachi‐oki, Japan, earthquake

et al. 2008

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[1] To explore the generation and propagation mechanisms of long-period ground motions, we used a 3-D finite difference method to simulate wave propagation during the 2003 M w 8.3 Tokachi-oki, Japan, earthquake. A large-scale computation with an inverted slip model and a geological-and geophysical-based velocity structure model successfully reproduced the overall characteristics of substantial observed velocity seismograms for a period range of 3.3 to 25 s. Significant long-period ground motions of extended duration were observed in the Yufutsu basin, where oil tanks were damaged at Tomakomai because of sloshing associated with the ground motions. Our simulation revealed that the combination of the large and shallow earthquake and the deep extent of the sedimentary basin generated long-period ground motions with a duration of several hundred seconds. The Yufutsu basin contains an internal subbasin that deepens from east to west, in contrast with the geometry of the overall basin that deepens from west to east. The long-period ground motions were amplified in both the eastern and western parts of the basin, with the durations being greatly extended in the western part. A series of computations with and without each of the velocity layers within the basin demonstrated that the basin response amplifies long-period ground motions as expected and that the subbasin response is effective in amplifying and extending long-period ground motions. Our quantitative 3-D finite difference simulations clarify the generation of disastrous long-period ground motions that occurred in the Yufutsu basin during the 2003 Tokachi-oki earthquake.

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“…Then, using the obtained source model together with a threedimensional (3-D) velocity structure model, we conduct a forward simulation of long-period (< 0.5 Hz) ground motion and compare the result of the simulation with the observations, especially in the Ishikari Lowland. During the 2003 Tokachi-oki earthquake (M JMA 8.0), significant long-period ground motion was observed in the Ishikari Lowland, and the ground-motion characteristics were investigated using a forward waveform simulation (e.g., Hatayama et al 2007;Aoi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake

Kubo

Iwaki

Suzuki

et al. 2020

Earth Planets Space

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In this study, we investigate the source rupture process of the 2018 Hokkaido Eastern Iburi earthquake in Japan (MJMA 6.7) and how the ground motion can be reproduced using available source and velocity models. First, we conduct a multiple-time-window kinematic waveform inversion using strong motion waveforms, which indicates that a large slip area located at a depth of 25–30 km in the up-dip direction from the hypocenter was caused by a rupture propagating upward 6–12 s after its initiation. Moreover, the high-seismicity area of aftershocks did not overlap with the large-slip area. Subsequently, using the obtained source model and a three-dimensional velocity structure model, we conduct a forward long-period (< 0.5 Hz) ground-motion simulation. The simulation was able to reproduce the overall ground-motion characteristics in the sedimentary layers of the Ishikari Lowland.

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Control Factors of Spatial Variation of Long-Period Strong Ground Motions in the Yufutsu Sedimentary Basin, Hokkaido, during the Mw 8.0 2003 Tokachi-oki, Japan, Earthquake

Cited by 30 publications

References 13 publications

Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake

Three‐dimensional finite difference simulation of long‐period ground motions for the 2003 Tokachi‐oki, Japan, earthquake

Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake

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