| 講演要旨(和文) | | 地震発生時に詳細な震度分布を即時的に把握することは,災害発生時の初動計画において極めて重要なことである。兵庫県南部地震以降,日本全国に多数の地震観測点が設置されたが,市町村単位では1点から,高々数点であり,地域住民自身による自助・共助の観点では十分な密度とは言えない。そのため,最小限のデータから面的震度を推定する手法の開発が必要である。小田・岩楯(2008)は,2地点の強震記録を用いた面的震度の推定手法を提案したが,本研究では,地震観測点を1地点しか持たない地域へ適用可能とする手法の開発を行った。開発した手法を横浜市へ適用した結果,観測地と推定値との相関係数が0.84と良好な推定結果が得られた。 |
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| | 講演要旨(英文) | | In order to reduce the earthquake disaster, it is very important to know the strong ground motion after a big earthquake as soon as possible. In Japan, high-density seismograph networks were installed after the Hanshin-Awaji earthquake. The typical spacing between each seismic station is approximately 20 km. However, there are many cities and towns that have only one seismic station. The Hanshin-Awaji earthquake has shown us the limits of governmental help and importance of the self-help by citizen. The density of seismic stations in Japan is not still enough for civilian self-disaster prevention. So it is important to know strong ground motions with higher density In this article, therefore, a new method to estimate high-resolution seismic intensity maps using only one seismic station data has been developed. The new method is able to estimate seismic intensity of any given point. The new method has been applied to Yokohama City. As the results, high-resolution seismic intensity map has been achieved immediately with good accuracy. |
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