Observation of 1- to 5- sec Microtremors and Their Application to Earthquake Engineering. Part II

Naruse, Seiji; Izuhara, Kohji; Takeuchi, Fumiaki; Ohta, Yutaka; Kono, Hiroshi; Goto, Noriko; Shiono, Keishi; Kudo, Kazuyoshi; Sakajiri, Naomi

doi:10.4294/zisin1948.29.1_25

Cited by 3 publications

(5 citation statements)

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“…noises of the period range from 1 to 4 s; this is equivalent to those seismic ground noises called "long period microtremors" by other authors (e.g., NARUSE et al, 1976).…”

Section: Introductionmentioning

confidence: 86%

“…There are various ways for investigating the subsurface structure based on microseisms, i.e., (1) methods in which one utilizes predominant periods (e.g., KANAI et al, 1954), (2) methods in which one evaluates changes in amplitude (e.g., NARUSE et al, 1976), and (3) methods in which one uses phase velocities (AKI, 1957). All these methods were applied in those areas where subsurface structures were horizontally stratified or slowly varying laterally.…”

Section: Introductionmentioning

confidence: 99%

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Discontinuity of basement rock depth in the eastern coast of lake Biwa discovered by observations of microseisms.

Tsutsui

Kobayashi

1989

J,Phys,Earth

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We observed microseisms of the period range from 1 to 4 s with horizontalmotion seismometers on two linear seismic arrays, each about 10 km long, in a low seismicity plain on the south-east coast of Lake Biwa.Stations on the linear arrays are classified into two groups based on the difference of spectral characteristics of microseisms: one is the stations to the west of the Hino River that exhibited peaks around the period of 3 s in the spectral ratio to a fixed reference station, and the other is those to the east of the Hino River that had no peaks in that period range. The difference of the spectral ratios may be attributed to the lateral change of the depth of basement rock.In order to determine the depth of the basement rock on both sides of the river, we observed microseisms on both sides with vertical-motion seismometers arranged in two-dimensional arrays. We estimated the subsurface structure from phase velocities of observed microseisms by assuming that the main part of the observed microseisms consisted of the fundamental mode of Rayleigh waves, and compared the inferred structure with a deep-drilling log available in the neighborhood.The estimated depths of the basement rock are 0.9 km on the west side and 0.1 km on the east side of the Hino River. This is consistent with the existing result of gravitational survey.

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“…noises of the period range from 1 to 4 s; this is equivalent to those seismic ground noises called "long period microtremors" by other authors (e.g., NARUSE et al, 1976).…”

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Discontinuity of basement rock depth in the eastern coast of lake Biwa discovered by observations of microseisms.

Tsutsui

Kobayashi

1989

J,Phys,Earth

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“…Since then, investigations on long-period microtremors at periods of more than 1 s have been conducted in Japan, because of the engineering requirement to estimate long-period strong ground motion for seismic design of large-scale man-made structures. Naruse et al (1976) carried out long-period microtremor measurements in the Hachinohe area and found two distinct spectral peaks in the long-period range in sites on sediments, as can be seen in Fig. 18.…”

Section: Long-period Microtremorsmentioning

confidence: 93%

“…They interpreted this as implying that the common peaks at all the sites are due to the input wave to the sediments and another spectral peak, which differs from site to site, indicates the predominant period of soils beneath the sites. Naruse et al (1976) estimated the thickness of deep soils by using the distribution of the predominant period. Similar results were observed from microtremor measurements in several regions in Japan (Taga, 1983;Kagami et al, 1976).…”

Section: Long-period Microtremorsmentioning

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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“…Estimation of vibrational characteristics of thick soil deposits has been developed on the basis of observation of long-period microtremors (e.g., Naruse et al, 1984). However, the relation between geological conditions and vibrational characteristics of microtremors still remains open to discussion.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Characteristics of Microseisms and Their Applicability to Microzoning in a Sedimentary Basin.

1992

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In order to study the applicability of microseisms to microzoning of an urban area in a sedimentary basin, characteristics of microseisms were examined through simultaneous observations at ground sites and rock sites in and around the Kyoto Basin, southwest Japan. Time-invariant and site-specific soil amplifications were discussed on the basis of spectral ratios averaged over repeated observations (ground site/rock site):(1) horizontal amplification is larger than vertical one; (2) as the site location changes from the edge of basin to the center, the frequency range with large amplification extends to lower frequency; and (3) at the margin inside the basin, amplification in the direction parallel to the edge of basin is larger than that normal to the edge. Amplification factors thus obtained were nearly the same as those for seismic surface waves from the 1984 west Nagano Prefecture earthquake of M 6.8. Duration of vibration at a ground site during the earthquake was much longer than that at a rock site around the peak frequency of amplification for microseisms. Therefore, amplification factor for microseism can be used as a useful measure to predict long-period vibrational characteristics during earthquakes.

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Observation of 1- to 5- sec Microtremors and Their Application to Earthquake Engineering. Part II

Cited by 3 publications

References 0 publications

Discontinuity of basement rock depth in the eastern coast of lake Biwa discovered by observations of microseisms.

Discontinuity of basement rock depth in the eastern coast of lake Biwa discovered by observations of microseisms.

Strong Motion Seismology in Japan.

Vibrational Characteristics of Microseisms and Their Applicability to Microzoning in a Sedimentary Basin.

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