Prediction of ground motion in the Osaka sedimentary basin associated with the hypothetical Nankai earthquake

Sekiguchi, Haruko; Yoshimi, Masayuki; Horikawa, Haruo; Yoshida, Kunikazu; Kunimatsu, Sunao; Satake, Kenji

doi:10.1007/s10950-007-9077-8

Cited by 21 publications

(10 citation statements)

References 9 publications

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“…Detailed studies of the Osaka basin are presented in Yamada and Horike (), Sekiguchi et al . () and Iwaki and Iwata (), but the results of these studies likely do not accurately characterize the local site transfer function. Instead, we computed the site transfer functions using software developed by C. Mueller (personal communication, 1997), which is based on Haskell's shear wave propagation method (Haskell, , ).…”

Section: Introductionmentioning

confidence: 92%

Response of a tall building far from the epicenter of the 11 March 2011 M 9.0 Great East Japan earthquake and aftershocks

Çelebi

Okawa

Kashima

et al. 2012

Struct. Design Tall Spec. Build.

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SUMMARYThe 11 March 2011 M 9.0 Great East Japan earthquake generated significant long-duration shaking that propagated hundreds of kilometers from the epicenter and affected urban areas throughout much of Honshu. Recorded responses of a tall building at 770 km from the epicenter of the mainshock and other related or unrelated events show how structures sensitive to long-period motions can be affected by distant sources. Even when the largest peak input motions to the building is about 3% g, the strong-shaking duration was about 140 s. The 300-to 1000-s prolonged responses of the building are primarily due to a combination of site resonance (e.g. structural fundamental frequency~0.15 Hz and site frequency~0.13-0.17 Hz) and low damping (~1-2%) of the structure. Response modification technologies can improve the response of the building during future earthquakes. The need-to-consider risks to such built environments from distant sources are emphasized.

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Section: Introductionmentioning

confidence: 92%

Response of a tall building far from the epicenter of the 11 March 2011 M 9.0 Great East Japan earthquake and aftershocks

Çelebi

Okawa

Kashima

et al. 2012

Struct. Design Tall Spec. Build.

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“…Hatayama et al 1995) and to predict strong motions for scenario earthquakes (e.g. Sekiguchi et al 2008).…”

Section: Ground Motion Simulation Of a M65 Earthquakementioning

confidence: 99%

Simulation of long-period ground motion in the Osaka sedimentary basin: performance estimation and the basin structure effects

Iwaki

Iwata

2010

Geophysical Journal International

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S U M M A R YWe assessed the applicability of the 3-D subsurface velocity structure model of the Osaka sedimentary basin in western Japan for simulations of long-period ground motion (3-20 s) based on two types of long-period ground motion characteristics: (1) strong ground motion from a specific earthquake and (2) site-specific, event-independent horizontal-to-vertical spectral ratio (HV) characteristics obtained from earthquakes with various azimuths. For the first type, we compared the observed and synthetic ground motions in terms of velocity waveforms and pseudo-velocity response spectra; we then proposed an objective index to evaluate the goodness-of-fit from one site to the next. The simulation satisfactorily reproduced the observed ground motion at many stations; however, the model needs improvement for reproducing the ground motion at some stations. For the second type, we first demonstrated that site-specific HV characteristics can be obtained from the coda portion of strong motion observation records for earthquakes with various azimuths. We then demonstrated that the HVs obtained from 3-D ground motion simulations for earthquakes with various azimuths (3DHV) also have sitespecific stable values. The synthetic 3DHV was compared with the observed HV, and the 3-D basin velocity structure model was demonstrated as able to reproduce the HV peak periods within ±1 s at many stations. However, at some stations, the peak periods of the 3DHV were systematically longer than those of the observed HV by more than 1.5 s, which corresponded to the stations of poor goodness-of-fit scores in the ground motion simulation. 3DHV was also compared with the theoretical ellipticity of the fundamental Rayleigh wave (1DHV). The peak periods of 3DHV and 1DHV were inconsistent with each other at some sites, which implies that 3DHV is affected by the lateral heterogeneity of the structure around the site. We found the systematically biased characteristics of the discrepancy in 3DHV and 1DHV peaks in specific regions. The spatial extent of the area that affects 3DHV is related to the complexity in the bedrock structure and the dominant period of 3DHV.

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“…Sekiguchi et al (2008) and Kawabe and Kamae (2008) provide examples of these for the Osaka basin. Direction of wave incidence also affects responses within a basin.…”

Section: Discussionmentioning

confidence: 99%

Visualization of Green’s function anomalies for megathrust source in Nankai Trough by reciprocity method

Petukhin¹,

Miyakoshi²,

Tsurugi³

et al. 2016

Earth Planet Sp

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We used simulation by the reciprocity method to visualize the distribution of Green's function amplitudes in the source of a megathrust earthquake in the Nankai Trough and considered the effects of various areas (asperities or strong motion generation areas) on the simulated long-period ground motions at Konohana in the Osaka basin. We employed a fault source model proposed for an anticipated M9-class event in the Nankai Trough and the 3D Japan Intergrated Velocity Structure Model developed for simulations of long-period ground motions in Japan. Green's functions were calculated for about 1400 subsources by combining the finite-difference method and the reciprocity approach. Depths, strikes, and dips of subsources were adjusted to the shape of the upper boundary of the Philippine Sea plate. Ground motions with periods of 4-20 s were considered. The simulated distribution of peak amplitudes of Green's functions identified two strongly anomalous areas: (1) a large along-strike elongated area just south of the Kii Peninsula and (2) a parallel area closer to the trench. The elongation of the anomalies corresponded well with depth isolines at the top of the Philippine Sea plate. Postulating that plate shape influences simulated ground motions, we investigated the effect on Green's function amplitudes of phenomena related to plate shape: radiation pattern; variations of medium properties (e.g., velocity and density) at subsource depths; depth, strike, and dip; and the effect of soft sediments. We suggest that the cumulative effect on Green's function amplitudes of subsource radiation patterns, medium properties at subsource depth, reflection from crustal interfaces, and passage through soft sedimentary layers plays a critical role in the formation of amplitude anomalies. Analysis of waveforms and the time delay of peak amplitude demonstrate that large-amplitude waves of Green's functions in shallow parts of the plate boundary are composed mostly of surface waves.

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Prediction of ground motion in the Osaka sedimentary basin associated with the hypothetical Nankai earthquake

Cited by 21 publications

References 9 publications

Response of a tall building far from the epicenter of the 11 March 2011 M 9.0 Great East Japan earthquake and aftershocks

Response of a tall building far from the epicenter of the 11 March 2011 M 9.0 Great East Japan earthquake and aftershocks

Simulation of long-period ground motion in the Osaka sedimentary basin: performance estimation and the basin structure effects

Visualization of Green’s function anomalies for megathrust source in Nankai Trough by reciprocity method

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