Seismic Intensity Distribution of Meiji 22 Kumamoto Earthquake

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  • 明治22年熊本地震の詳細震度分布
  • メイジ 22ネン クマモト ジシン ノ ショウサイ シンド ブンプ

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<p>On July 28, 1889 (Meiji 22), an earthquake (M＝6.3) occurred in the western part of Kumamoto city. The damage statistics for each municipality are reported in the Official Gazette. The data on ground fissures and the seismic damage to houses, bridges, and stonewalls was used to estimate the seismic intensity based on the relation between seismic intensity and seismic damage. We obtained the seismic intensity distribution of this event. The obtained seismic-intensity map was compared with the site amplification factor data provided by the National Research Institute for Earth Science and Disaster Resilience (NIED). It seems that the regions with large site amplification factors tend to experience high seismic intensities. The seismic intensity of some areas estimated in this study were 2-3 levels greater than that estimated from the data on collapsed houses. The houses of the Meiji period were generally located on relatively strong ground with a small amplification factor. In contrast, bridges often were built on weak ground. Thus, the seismic intensity determined only from the damage to houses may sometimes be smaller than that estimated from damage to other structures. Nowadays, residential areas exist not only on strong ground but also on relatively weak ground. In the event of a large earthquake, the seismic damage to houses may be more severe than that in the Meiji period.</p>

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