Revision of attenuation formula considering the effect of fault size to evaluate strong motion spectra in near field

Ohno, Susumu; Ohta, Tokiharu; Ikeura, Tomonori; Takemura, Masashi

doi:10.1016/0040-1951(93)90260-q

Cited by 58 publications

(18 citation statements)

References 5 publications

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“…The Xeq for each record was calculated using the slip distribution of the fault model listed in Table 1, on the assumption that Moi(f) is proportional to slip on the i-th segment (Ohno et al, 1993). When the slip distribution was not available, uniform distribution was assumed.…”

Section: Datamentioning

confidence: 99%

“…To solve this problem, we proposed a new distance measure: equivalent hypo- central distance (Xeq), which is derived from shortperiod approximation of the strong motion energy spectrum based on the fault model theory (Ohno et al, 1993). In this paper, first, we evaluate an attenuation relation of response spectra by regression analysis of strong-motion data recorded in California, which include many near-source data.…”

Section: Introductionmentioning

confidence: 99%

“…Attenuation Relation of Acceleration Response Spectra 2.1 Equivalent hypocentral distance Equivalent hypocentral distance (Xeq) is derived from short-period approximation of the strongmotion energy spectrum based on the fault model theory by Ohno et al (1993). Xeq is calculated using the following formula: (1) where n is the number of segments on the earthquake fault plane, Moi(f) is the seismic moment density on the i-th segment and Xi is the distance between the i-th segment and the site.…”

Section: Introductionmentioning

confidence: 99%

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Intensity of Strong Ground Motion on Pre-Quaternary Stratum and Surface Soil Amplifications during the 1995 Hyogo-ken Nanbu Earthquake, Japan.

et al. 1996

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We obtained an attenuation relation of response spectra to magnitude, source-to-site distance and soil classification by performing regression analysis of strong-motion data recorded in California. We applied the attenuation relation to the 1995 Hyogo-ken Nanbu earthquake and found that the estimates at pre-Quaternary sites agree well with the observed values. Peak ground accelerations on pre-Quaternary stratum in Kobe are consistent with the source models, and they are estimated to be about 350 cm/s2, while the estimates for Awaji Island vary with the source models from 600 to 1,200 cm/s2. We calculated the amplification factors of Quaternary stratum during the Hyogo-ken Nanbu earthquake by taking ratios between the observed records at Quaternary sites and estimates on pre-Quaternary stratum. As the amplifications in the heavily damaged area are large near the natural period of wooden houses (04-0.5 s), these short-period amplifications might be one of the reasons Kobe suffered extensive damage. The estimated amplification factors generally agree with those estimated from other earthquake records as well as with one-dimensional wave propagation theory, while the amplifications at alluvial sites were larger at periods of more than 1 s and might be affected by surface waves.

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Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intensity of Strong Ground Motion on Pre-Quaternary Stratum and Surface Soil Amplifications during the 1995 Hyogo-ken Nanbu Earthquake, Japan.

et al. 1996

Self Cite

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“…Most of them, however, are inadequate in the choices of distance and definition of the distance, because they were decided arbitrarily. To solve this problem, and Ohno et al (1993) proposed a new distance measure, Equivalent Hypocentral Distance (EHD), on the assumption of randomness of seismic wave phases in the frequency range higher than the corner frequency of the source spectrum of the target large event.EHD is the distance from the virtual point source, which radiates the same seismic energy to the site as an actual finite-sized fault. If the fault plane is divided into n small segments, EHD Xeq is expressed as Fig.…”

Section: Empirical Approachmentioning

confidence: 99%

“…The seismic moment of each small segment may be substituted for the seismic moment density Moi(f), in Eq. (7), under the assumption that the source time function is the same form on time for all the small segments on the fault plane (Ohno et al, 1993). EHD includes the effects of fault size, fault geometry, distribution of displacement on the fault plane, and location of the site.…”

Section: Empirical 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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Risk estimation of the disaster waste generated by both ground motion and tsunami due to the anticipated Nankai Trough earthquake

Ishibashi

Akiyama

Kojima

et al. 2021

Earthq Engng Struct Dyn

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The amount of disaster waste is one of the most important performance indicators in quantifying the resilience of a community. In fact, disaster waste can have significant negative impacts on the environment in affected regions and hinder the postdisaster recovery process. Appropriate disaster waste management should be developed in Japan before the occurrence of the Nankai Trough earthquake. It is expected that the seismic and tsunami intensities caused by the anticipated Nankai Trough earthquake will be substantially larger than those caused by the 2011 Great East Japan earthquake. In this paper, a risk-based methodology is presented for estimating the amount of disaster waste generated by both the ground motions and the tsunami due to the anticipated Nankai Trough earthquake. First, Monte Carlo simulation-based probabilistic hazard analyses are performed to obtain seismic and tsunami hazard curves considering the uncertainty associated with fault movement along the Nankai Trough. Structural damage data associated with past earthquakes are used to develop seismic and tsunami fragility curves. The amount of disaster waste generated from a single structure is defined as the generation unit and is determined based on past disasters. Finally, with the aid of a geographic information system, the risk of disaster waste can be estimated using the hazard and fragility curves and the generation units. As an illustrative example, the risk curves and expected values associated with disaster waste in Mie Prefecture, Japan, are estimated based on the proposed framework.

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Revision of attenuation formula considering the effect of fault size to evaluate strong motion spectra in near field

Cited by 58 publications

References 5 publications

Intensity of Strong Ground Motion on Pre-Quaternary Stratum and Surface Soil Amplifications during the 1995 Hyogo-ken Nanbu Earthquake, Japan.

Intensity of Strong Ground Motion on Pre-Quaternary Stratum and Surface Soil Amplifications during the 1995 Hyogo-ken Nanbu Earthquake, Japan.

Strong Motion Seismology in Japan.

Risk estimation of the disaster waste generated by both ground motion and tsunami due to the anticipated Nankai Trough earthquake

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