Determination of the GUTENBERG-RICHTER'E Magnitude of Earthquakes occurring in and near Japan

Tsuboi, Chûji

doi:10.4294/zisin1948.7.3_185

Cited by 53 publications

(36 citation statements)

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“…Attenuation curves and their standard deviations based on empirical equations by Si and Midorikawa (1999) are indicated by solid and dashed lines, respectively, in the top (PGA) and middle panels (PGV). Attenuation curves, based on empirical equations of magnitudes by Tsuboi (1954) Good agreement is found between the observation and simulation for PGV and PGD values at most of the stations in Fig. 5.…”

Section: Comparison Of Peak Amplitudes Between Observations and Simulsupporting

confidence: 53%

“…Peak ground velocity (PGV) was then obtained by integrating the acceleration data and measuring larger values of the horizontal components following that for PGV by Si and Midorikawa (1999). Peak ground displacement (PGD) was obtained after integrating the velocity data and measuring peak amplitude in the waveforms of vector sums of the horizontal components following the definition of empirical equations for earthquake magnitudes by Tsuboi (1954).…”

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

“…As some of the DONET stations did not start operating until August 2011, values for events that occurred before these stations were installed are not plotted for these stations. Figure 3a also shows the empirical attenuation curves superimposed for PGA and PGV (Si and Midorikawa 1999), and PGD (Tsuboi 1954). Moment magnitudes (Mw) were used to obtain the attenuation curves of PGA and PGV following Si and Midorikawa (1999) and the JMA magnitudes (M JMA ) for PGD following Tsuboi (1954).…”

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

“…Figure 3a also shows the empirical attenuation curves superimposed for PGA and PGV (Si and Midorikawa 1999), and PGD (Tsuboi 1954). Moment magnitudes (Mw) were used to obtain the attenuation curves of PGA and PGV following Si and Midorikawa (1999) and the JMA magnitudes (M JMA ) for PGD following Tsuboi (1954). Note that the equation of PGV by Si and Midorikawa (1999) is defined not on the ground's surface but on stiff soil with Vs = 600 m/s.…”

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

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Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Nakamura

Hayashimoto²,

Takahashi

et al. 2014

Mar Geophys Res

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Seismic wave amplifications were investigated using strong-motion data obtained from the ground's surface (K-net) on the Kii peninsula (southwestern Japan) and from the network of twenty seismic stations on the seafloor (DONET) located off the peninsula near the Nankai trough. Observed seismograms show that seismic signals at DONET stations are significantly larger than those at K-net stations, independent of epicentral distances. In order to investigate the cause of such amplifications, seismic wavefields for local events were simulated using the finitedifference method, in which a realistic 3D velocity structure in and around the peninsula was incorporated. Our simulation results demonstrate that seismic waves are significantly amplified at DONET stations in relation to the presence of underlying low-velocity sediment layers with a total thickness of up to 10 km. Our simulations also show considerable variations in the degree of amplification among DONET stations, which is attributed to differences in the thickness of the sediment layers. The degree of amplification is relatively low at stations above thin sediment layers near the trough axis, but seismic signals are much more amplified at stations closer to the Kii peninsula, where sediment layers are thicker than those at the trough axis. Simulation results are consistent with observations. This study, based on seafloor observations and simulations, indicates that because seismic signals are amplified due to the ocean-specific structures, the magnitude of earthquakes would be overestimated if procedures applied to data observed at land stations are used without corrections.

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Section: Comparison Of Peak Amplitudes Between Observations and Simulsupporting

confidence: 53%

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

Section: Peak Amplitudes Observed At Land and Seafloor Stationsmentioning

confidence: 99%

See 2 more Smart Citations

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Nakamura

Hayashimoto²,

Takahashi

et al. 2014

Mar Geophys Res

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show abstract

“…Eq. 12 can be compared with the regression equations obtained by Tsuboi (1954), M=1.36+0.651oi0D+1.30109iod (13a) M=1.11+0.7810910D+1.2710 1 (13 b) M=-0.83+log10D+1.731og1od (13 c) in which zl (km) is the epicentral distance. Eqs.…”

Section: Discussionmentioning

confidence: 99%

Measurement of the Jma Magnitude With Slip Displacement

Igarashi

Hakuno

1987

Doboku Gakkai Ronbunshu

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New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

Peng

Yang

Zheng

et al. 2017

Geophysical Research Letters

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Two issues related to the average period τc early‐warning parameter are the magnitude saturation effect on large earthquakes and considerable scatter for small earthquakes. To reduce the effect of these two issues on earthquake early‐warning systems, we introduce a new τc regression relationship derived from all P wave time windows (PTWs) in high‐pass filtered (T = 0.075 Hz) strong‐motion data for three damaging moderate‐to‐large earthquakes. Our results show that this relationship provides a better and more stable magnitude prediction than those derived from 3 s PTW without a saturation effect on large earthquakes with M < 7.5. It is expected that fewer false alerts (those outside the magnitude uncertainty tolerance) would be issued. Additionally, a reduction of the initial PTWs to 1–2 s and evolutionary calculation with an expanding window allow more lead time for small‐to‐moderate events.

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Determination of the GUTENBERG-RICHTER'E Magnitude of Earthquakes occurring in and near Japan

Cited by 53 publications

References 0 publications

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Measurement of the Jma Magnitude With Slip Displacement

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

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Determination of the GUTENBERG-RICHTER'E Magnitude of Earthquakes occurring in and near Japan

Cited by 53 publications

References 0 publications

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

Measurement of the Jma Magnitude With Slip Displacement

New τc regression relationship derived from all P wave time windows for rapid magnitude estimation

Contact Info

Product

Resources

About

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation