Re-examination of Magnitude's Formula for Records of Velocity Seismograph with Natural Frequency of 1Hz

Yoshioka, Katsuhei; Iio, Yoshihisa

doi:10.4294/zisin1948.41.3_437

Cited by 2 publications

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“…Values of 0.85 (Watanabe, 1971), 0.78 (Yoshioka and Iio, 1988), and 1/1.27 (0.79) (Kanbayashi, 1992) were used to express relationship between M J M A and the logarithm of the maximum velocity amplitude. Kakishita et al (1992) showed data which supported the result by Watanabe (1971).…”

Section: Introductionmentioning

confidence: 99%

Relationship between displacement and velocity amplitudes of seismic waves from local earthquakes

Katsumata¹

2014

Earth Planet Sp

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Relationship between displacement and velocity amplitudes of seismic waves was examined with data at stations within 200 km from 142 local earthquakes in and near Japan. The expected value of the coefficient for the logarithmic velocity amplitude to the logarithmic displacement amplitude is 0.5 when a self-similar scaling model is assumed. Observed value of the coefficient is about 0.8∼0.9. This value appears to be valid at least in the magnitude range from 3.0 to 6.5. Although a spectral model simulation suggested that apparent large contents of high-frequency components were required to explain the observed coefficient, no distinct deviation from the ω-square model was found in the observed spectral ratios from earthquakes of different sizes, for which the path effects were virtually excluded. By using an empirical Green's function which would correct the effects of propagation and site amplification, it was shown that the apparent deviation from the self-similar scaling model was due to propagation effects.

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Section: Introductionmentioning

confidence: 99%

Relationship between displacement and velocity amplitudes of seismic waves from local earthquakes

Katsumata¹

2014

Earth Planet Sp

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“…For the coefficient of M that relates the maximum vertical velocity to the Tsuboi's magnitude, 0.85 in Eq. (3), Yoshioka and Iio (1988) used a value of 0.78. Relationship between magnitude and strong ground velocity has been examined to estimate peak ground motion from magnitude for disastrous earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Magnitude determination of deep-focus earthquakes in and around Japan with regional velocity-amplitude data

Katsumata¹

2014

Earth Planet Sp

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This paper proposes a new method to determine earthquake magnitude for small deep-focus earthquakes by using velocity-amplitude data. For deep-focus earthquakes, body-wave magnitude has been widely used, but it is difficult to directly apply the conventional methods to the data from short-period seismometers of regional networks. In the proposed method, moment magnitude is used to obtain the attenuation function for epicentral distance and focal depth, where the influence of inhomogeneous Q structure is incorporated. This effect is further reduced by introducing a correction term that is a function of distance from the trench axis to an observation station and focal depth. The attenuation function and correction term were estimated for the velocity amplitude data obtained by the network of the Japan Meteorological Agency. The velocity-amplitude magnitude we propose is in satisfactory agreement with the moment magnitude, and provides stable magnitude values for small earthquakes of deep to shallow focal depths seamlessly.

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Re-examination of Magnitude's Formula for Records of Velocity Seismograph with Natural Frequency of 1Hz

Cited by 2 publications

References 0 publications

Relationship between displacement and velocity amplitudes of seismic waves from local earthquakes

Relationship between displacement and velocity amplitudes of seismic waves from local earthquakes

Magnitude determination of deep-focus earthquakes in and around Japan with regional velocity-amplitude data

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