Analysis and Numerical Modeling of Surface-Wave Propagation in a Sedimentary Basin.

Yamanaka, Hiroaki; Seo, Kazuoh; Samano, Takanori

doi:10.4294/jpe1952.40.57

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…This ambiguity of interpretation may come from the fact that the earthquakes used were shallow. Yamanaka et al (1989Yamanaka et al ( , 1992 found Love waves with a period range between 5 and 10 s in linear array data in the southern Kanto basin from group velocity analyses and interpreted them as basin-transduced waves from two-dimensional numerical simulations, though they did not determine the arrival directions of the Love waves.…”

Section: Introductionmentioning

confidence: 99%

Basin-Induced Love Waves in the Eastern Part of the Osaka Basin.

et al. 1995

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Well-developed basin-induced waves with a predominant frequency of about 0.3 Hz were detected as later arrivals of a direct S-wave in seismograms observed in the Osaka basin located in western Honshu, Japan from three deep earthquakes occurring near Japan. The wave type and the secondary source area of the basin-induced waves were examined using a semblance technique and polarization analyses for small aperture array data in the center of the basin. The results well agree with the characteristics of the Love wave such as particle motion perpendicular to a propagation direction and dispersed apparent phase velocities. The arrival direction was evaluated to be almost due east. Seismograms from the east-west linear array crossing the basin show that the observed Love wave propagated from the east to the west after being excited at the eastern edge of the basin by incidence of the direct S-wave. Numerical simulations of two-dimensional SH problems were performed for the east-west cross section models of the Osaka basin subject to incidence of the direct S-wave. The synthetics agree well with the observed Love wave in a predominant frequency and a group velocity.

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Section: Introductionmentioning

confidence: 99%

Basin-Induced Love Waves in the Eastern Part of the Osaka Basin.

et al. 1995

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“…Axisymmetric calculations take only the same memory and computational time as (2, 2) calculations. Yuan et al (1986) and Yamanaka et al (1992) applied axisymmetric finite difference methods, and Sato and Hasegawa (1990) proposed an axisymmetric finite element method combined with a thin layer element method. Kohketsu (1987) and Baba (1989) developed axisymmetric versions of the Rayleigh-Fourier method, where Baba (1989) used the Laplace transform instead of the Fourier transform.…”

Section: Discussionmentioning

confidence: 99%

“…Yuan et al (1986) simulated the 3-dimensional strong motions observed during the Nov. 15, 1976 Ninghe, China earthquake (M=6.4) by use of an axisymmetric finite difference method incorporating a faulting model. Yamanaka et al (1992) also used an axisymmetric finite difference method to model Love-wave propagation in the Kanto plain, Japan.…”

Section: Interior Methodsmentioning

confidence: 99%

Modeling Seismic Wave Propagation in Complex Media.

Takenaka

1995

J,Phys,Earth

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We review the studies on modeling seismic wave propagation in complex media, which were carried out during the past 10 years by researchers at Japanese institutions. Special emphasis is placed on those works which are perceived as important but had little exposure outside Japan. We can say that the fundamental development of method for seismogram synthesis in the (3, 1) dimension was completed, where the first and second numbers in parentheses are the space dimensions of the wavefield and the heterogeneity of the medium. However, seismologists have been eager to model seismic propagation in the (2, 2), (3, 2), and (3, 3) dimensions during the last 10 years. Modeling seismic wave propagation in a full (3, 3) dimension is now limited to simple small-scale problems because of the extensive computation and large memory, even when using a supercomputer. Nevertheless, in laterally and vertically heterogeneous media, we have to calculate 3-dimensional wavefields in order to analyze real seismic records quantitatively. There exist two potential breakthroughs. One is to assume the medium is axisymmetric and the other to model (3, 2) dimensional wave propagation (the so-called 2.5 dimensional problem). Numerical methods have the potential to simulate seismic wave propagation in realistic environments of substantial spatio-temporal extent. Since we are not used to processing such an abundance of information, we have to investigate methods for analyzing and interpreting large volumes of computational data. These studies may well challenge our conception of seismic wave propagation.

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“…Later Phases at Station HNG Several researchers (e.g., Yamanaka et al, 1992;Kato et al, 1993;Hisada et al, 1993) investigated ground-motion characteristics observed at sites in the Tokyo metropolitan area from the shallow Izu earthquakes (Fig. lb) and pointed out that observed surface waves from the hu earthquakes are strongly affected by near-source heterogeneity in a Quaternary basin in Sagami Bay (Nishizawa et al, 1996).…”

Section: Estimation Of Source Model By Grid-search Technique Using Bo...mentioning

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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Analysis and Numerical Modeling of Surface-Wave Propagation in a Sedimentary Basin.

Cited by 12 publications

References 12 publications

Basin-Induced Love Waves in the Eastern Part of the Osaka Basin.

Basin-Induced Love Waves in the Eastern Part of the Osaka Basin.

Modeling Seismic Wave Propagation in Complex Media.

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

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