地震規模予測の考え方の違いが長大活断層で発生する地震の強震動予測結果にもたらす影響の評価 : 糸魚川-静岡構造線活断層帯北部・中部を震源断層として

概要

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In predicting strong ground motion from a scenario earthquake for a long active fault zone, we need to take into account of multi segment rupture during an event. For this case, two conflicting methods to estimate earthquake magnitude give different source models for the scenario earthquake. In this study, we construct six kinds of characterized source models by combining those two methods with three rupture scenario cases on the Itoigawa-Shizuoka Tectonic Line fault zone. The empirical Green's function method is applied to calculate synthetic ground motions. Obtained peak horizontal velocities from the synthetics are examined by comparison with the empirical attenuation relation. We also discuss variations of peak horizontal velocities among the models. Effect of selection of the two methods on variation of peak horizontal velocities is approximately equivalent to that of the different rupture scenarios.
2008-05-31