Polarization and Frequency-Wavenumber Spectrum Analysis for the Strong-Motion Array Data in Ashigara Valley, Japan.

Higashi, Sadanori; Kudo, Kazuyoshi

doi:10.4294/jpe1952.40.5

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…where c Ri and (H/V) Si are the theoretical phase velocity of Rayleigh waves and the H/V spectral ratio of surface waves at a frequency f i computed for a soil layer model considering the effects of fundamental and After Higashi and Kudo (1992). Miyakoshi and Okada (1996). higher modes determined by equation (20) in the article by Arai and Tokimatsu (2004), in which the value of Rayleighto-Love wave amplitude ratio for horizontal motions (R/L) is assigned to 0.7 at all frequencies, based on the studies by Matsushima and Okada (1990b) and Arai and Tokimatsu (2000).…”

Section: Joint Inversion Methodology Of Dispersion Curve and H/v Specmentioning

confidence: 99%

“…able geological information such as results of both seismic refraction and explosion surveys, and large aperture array observations of low-frequency microtremors (e.g., Shima et al, 1976; Kushiro Office in Hokkaido Association of Architects and Building Engineers, 1989;Higashi and Kudo, 1992;Miyakoshi and Okada, 1996).…”

Section: Joint Inversion Of Microtremor Dispersion Curve and H/v Specmentioning

confidence: 99%

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S-Wave Velocity Profiling by Joint Inversion of Microtremor Dispersion Curve and Horizontal-to-Vertical (H/V) Spectrum

Arai

Tokimatsu

2005

Bulletin of the Seismological Society of America

236

103

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A joint inverse analysis using both microtremor dispersion curve and horizontal-to-vertical (H/V) spectrum is proposed for estimating the S-wave velocity (V S ) profiles of subsurface soils. In the inversion, both microtremor dispersion and H/V data are assumed to be the Rayleigh-wave dispersion curve and the surface (both Rayleigh and Love) wave H/V spectrum that have been theoretically derived by taking into account the effects of their fundamental and higher modes. The proposed joint inversion as well as the conventional one using dispersion data alone is performed at four sites where shallow V S profiles down to engineering bedrock are available. The V S profiles estimated by the proposed joint inversion are more consistent with available down-hole velocity logs than those by the conventional method. In particular, the proposed inversion shows significant improvement in estimating bedrock V S structures compared to the conventional inversion. Sensitivity analyses indicate that the surface-wave H/V ratio is sensitive to the bedrock V S structure more than the Rayleigh-wave phase velocity, confirming that the proposed joint inversion including H/V spectrum is promising.

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Section: Joint Inversion Methodology Of Dispersion Curve and H/v Specmentioning

confidence: 99%

Section: Joint Inversion Of Microtremor Dispersion Curve and H/v Specmentioning

confidence: 99%

S-Wave Velocity Profiling by Joint Inversion of Microtremor Dispersion Curve and Horizontal-to-Vertical (H/V) Spectrum

Arai

Tokimatsu

2005

Bulletin of the Seismological Society of America

236

103

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“…lb) and a shallow reflection survey were conducted there by the Subcommittee for Geotechnical Survey on the Ashigara Valley Blind Prediction Test, JESG (1992). Higashi and Kudo (1992) and Higashi (1994) compiled those data and obtained two-and three-dimensional near-surface crustal profiles. In addition, Miyakoshi et al (1994) inferred P-and S-wave velocity structure near the station from Rayleigh-wave dispersion characteristics obtained from array measurements of microtremors.…”

Section: Uppermost Crustal Structurementioning

confidence: 99%

Estimates of regional and local strong motions during the great 1923 Kanto, Japan, earthquake (Ms8.2). Part 1: Source estimation of a calibration event and modeling of wave propagation paths

Sato

Helmberger

Somerville

et al. 1998

Bulletin of the Seismological Society of America

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This article is the first of a pair of articles that estimate regional and local strong motions from the 1923 Kanto, Japan, earthquake. This Ms 8.2 earthquake caused the most devastating damage in the metropolitan area in Tokyo history. In this article, we first calibrate wave propagation path effects with a moderate-sized modern event. This event, the Odawara earthquake of 5 August 1990 (M 5.1), is the first earthquake larger than M 5 in the last 60 years near the hypocenter of the 1923 Kanto earthquake. We estimate the source parameters based on a grid-search technique using body-waveform data bandpass filtered from 1 to 10 sec at four local stations, because accurate source parameters are critical for calibrating the propagation effects. We find that the Odawara earthquake had a depth of 15.3 km, a dip of 35°, a rake of 40°, a strike of 215°, a seismic moment of 3.3 × 1023 dyne-cm, a source duration of 0.65 sec, and a stress drop of 170 bars. Next, we investigate the effects of the propagation paths to the local and regional stations where seismograms of the 1923 Kanto earthquake were recorded, by comparing recorded waveforms with synthetic seismograms built with the calibration event. Path-specific flat-layered velocity models are estimated along travel paths from the event to stations Hongo (epicentral distance R = 82 km) in Tokyo, Gifu (R = 213 km), and Sendai (R = 374 km) using forward modeling. In constructing the velocity model for the Gifu station, we use STS-1 broadband seismograms recorded at the nearby Inuyama station. Consequently, at periods greater than 3 sec, the velocity models for stations Hongo and Gifu can successfully reproduce both body waves and direct surface waves, and the velocity model for Sendai station can explain the predominant direct surface waves. In the companion article (Sato et al., 1998), these velocity models are used to examine the adequecy of the variable-slip rupture models of the 1923 Kanto earthquake (Wald and Somerville, 1995; Takeo and Kanamori, 1992) to explain recorded seismograms and also to simulate strong motions from that event.

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“…Complex polarization analysis (Vidale, 1986) has also been used to determine the principal axis of the motion, which indicates the propagation direction. Many observations show that the propagation direction is not always coincident with the direction to the epicenter (e.g., Minamishima et al, 1986;Horike, 1988;Higashi and Kudo, 1992;Kinoshita et al, 1990). This suggests the effects of 3D irregularities in underground structure on wave propagation.…”

Section: Effects Of Topographical and Subsurface Irregularitiesmentioning

confidence: 99%

“…25. Hisada et al (1988) used the 2D Boundary Element Method considering a point source. A three-dimensional investigation was executed by Sato (1990), in which a hybrid model of thin layer elements and axisymetric finite elements is used for simulating the observation records of Kobe and Osaka during the 1961 Kita-Mino earthquake.…”

Section: Numerical Approachmentioning

confidence: 99%

Strong Motion Seismology in Japan.

1995

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This paper reviews strong motion seismology in Japan. It describes advances in strong motion seismology in the last decade, the current state of the art, and unresolved issues in the following areas: (1) Observation and data processing of strong ground motion, (2) Local site effects, and (3) Simulation and prediction of strong ground motion. In the first area, it reviews the current state of strong motion observation and data processing: fundamental subjects in strong motion seismology. In the next area, it describes empirical evaluations of site amplification factors, effects of soil nonlinearity, effects of topographical and subsurface irregularity, and application of microtremors. In the last area, it summarizes the results of empirical, semi-empirical, and numerical techniques for the simulation and the prediction of strong ground motions due to actual earthquakes. Finally, future directions of research are suggested, based on the current state of the art in strong motion seismology.

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Polarization and Frequency-Wavenumber Spectrum Analysis for the Strong-Motion Array Data in Ashigara Valley, Japan.

Cited by 4 publications

References 19 publications

S-Wave Velocity Profiling by Joint Inversion of Microtremor Dispersion Curve and Horizontal-to-Vertical (H/V) Spectrum

S-Wave Velocity Profiling by Joint Inversion of Microtremor Dispersion Curve and Horizontal-to-Vertical (H/V) Spectrum

Estimates of regional and local strong motions during the great 1923 Kanto, Japan, earthquake (Ms8.2). Part 1: Source estimation of a calibration event and modeling of wave propagation paths

Strong Motion Seismology in Japan.

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