2026-10-14T01:02:21Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33962497 2026-09-22T05:46:12Z category_1111 portal_316 item_type_3 month_year_09_2026

Data Sheet 1_Preliminary analysis of response spectra, energy spectra, and energy-input directionality for the 2026 Kumamoto earthquake.pdf Kenji Fujii (8656071) Building Science and Techniques 2026 Kumamoto earthquake directionality long-period ground motion momentary input energy response spectrum seismic energy input <p>The strong-motion record observed at K-NET Yatsushiro (KMM012) during the 2026 Kumamoto Earthquake exhibits remarkable characteristics in the long-period range. This study investigates the structural response and energy-input characteristics of KMM012 through bidirectional linear response analysis and compares them with those of strong-motion records from the 1995 Hyogo-ken Nanbu (Kobe) and 2016 Kumamoto earthquakes. Response spectra, cumulative input energy spectra, and maximum momentary input energy spectra are evaluated. The directionality of cumulative and momentary energy input is further examined using the principal axes of the cumulative input energy spectrum. The response spectral values of KMM012 exceed those of the previous records in the long-period range. For a damping ratio of 0.05, the pseudo-acceleration remains above 5.0 m/s² while the displacement reaches approximately 1.3 m. The cumulative input energy spectrum reaches a maximum value of 3.59 m/s at T = 3.14 s, while the maximum momentary input energy spectrum reaches 1.95 m/s at T = 2.50 s, indicating large energy input to structures with relatively long natural periods. Strong directionality is also observed: at T = 3.14 s, the ratio of the minor-to major-axis cumulative input energy spectra is 0.222, corresponding to an energy ratio of approximately 0.222² ≈ 0.049. In the period range where the energy input is large, the major-axis direction of cumulative input energy is predominantly southeast to east-southeast, while the displacement increments associated with the maximum momentary input energy are concentrated predominantly in the southeast direction. These findings demonstrate that KMM012 can impose large and strongly directional energy demands on long-period structures.</p> 2026-09-22T05:46:12Z Dataset Dataset 10.3389/fbuil.2026.1967966.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Preliminary_analysis_of_response_spectra_energy_spectra_and_energy-input_directionality_for_the_2026_Kumamoto_earthquake_pdf/33962497 CC BY 4.0