On January 1, 2024, at around 15:10 Beijing time (16:10 local time), a magnitude Mw7.5 (or Mj7.6) earthquake occurred near the Noto Peninsula in Ishikawa Prefecture, Japan. The earthquake resulted in loss of life and property damage. The study examines characteristics such as the attenuation characteristics of Peak Ground Acceleration (PGA) and acceleration response spectrum peak with respect to epicentral distance, the amplitude ratio of vertical and horizontal components of acceleration records, strong ground motion duration characteristics, and period-related properties using a selected set of 411 strong motion records. The results indicate that the peak ground motion recorded near the epicenter was relatively high, and the strong earthquake was distributed widely along the northeast-southwest direction on the western side of the Noto Peninsula, resulting in a large affected area. However, the intensity of ground motion rapidly decreased in a linear fashion with increasing epicentral distance, indicating a fast attenuation rate. The analyzed strong ground motion records showed significant long-duration characteristics, with the shortest duration being 13.38 seconds. Additionally, as the epicentral distance increased, the duration also tended to increase. Moreover, the “bimodal values” phenomenon was observed in the temporal records near the epicenter, which may be attributed to the presence of bi-directional fault rupture with longer fault planes. Furthermore, the strong ground motion records exhibited a relatively abundant low-frequency content, especially when the epicentral distance exceeded 100 km, indicating pronounced long-period characteristics. It can be attributed to the soil conditions of soft ground sites and the characteristics of earthquake clusters. The identified features can contribute to seismic design considerations for engineering structures.
Key words
Noto Peninsula Earthquake /
strong earthquake records /
period characteristics /
time-frequency characteristics
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