5:15 PM - 6:45 PM
[SSS10-P01] Attenuation characteristics of peak ground motions during the 2024 Noto Peninsula Earthquake
Keywords:2024 Noto Peninsula Earthquake, PGA, PGV, attenuation characteristics, Ground motion model
On 1st January, 2024, an earthquake of Mw 7.5 occurred in Noto peninsula, Ishikawa prefecture, Japan. In this study, we compared the attenuation characteristics of the peak ground motions (PGA and PGV) with the ground motion model of Si and Midorikawa (1999) developed in Japan, including the records in the source area.
The strong motion records used in this study are those recorded by K-NET and KiK-net. PGA is derived after filtering the seismic waves and PGV is derived by integrating the filtered acceleration waveform to velocity waveform. The larger value of two horizontal components is used in the analysis. The observed PGV are divided by an amplification factor defined by Si and Midorikawa (1999) to derive PGV at stiff ground with VS30=600m/s. We used the fault model estimated by GSI to calculate the closest distance from an observation station to the seismic fault (Fault distance).
Fig.1 shows the attenuation characteristics of PGA and PGV for the Noto peninsula earthquake. The figure shows that the prediction by Si and Midorikawa (1999) are generally consistent with the observed PGAs and PGVs. In the near-fault area, the observations show generally larger values than the predictions. This is because of that (1) there are only observation stations in the hanging-wall area but no data in the footwall area on the seaward side, (2) the effects of site condition, and others.
The strong motion records used in this study are those recorded by K-NET and KiK-net. PGA is derived after filtering the seismic waves and PGV is derived by integrating the filtered acceleration waveform to velocity waveform. The larger value of two horizontal components is used in the analysis. The observed PGV are divided by an amplification factor defined by Si and Midorikawa (1999) to derive PGV at stiff ground with VS30=600m/s. We used the fault model estimated by GSI to calculate the closest distance from an observation station to the seismic fault (Fault distance).
Fig.1 shows the attenuation characteristics of PGA and PGV for the Noto peninsula earthquake. The figure shows that the prediction by Si and Midorikawa (1999) are generally consistent with the observed PGAs and PGVs. In the near-fault area, the observations show generally larger values than the predictions. This is because of that (1) there are only observation stations in the hanging-wall area but no data in the footwall area on the seaward side, (2) the effects of site condition, and others.