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| | Abstract | | In a narrow range, such as within the city, it has been found that the sway of ground is difficult due to differences of surface subsoil in history. We make an high-density seismic observation in Zushi city with complex terrain and underground structure. From these things, we set up 61 seismographs there and observed during about a half year from June. Among them , 59 points and 15 earthquake was the subject of analysis. First, from the obtained observation data, we determined the three-component synthetic maximum speed and the Fourier spectrum of each component. Then, we think the most sway of small was the observation point as outcrop foundation, asked the ratio of each observation point to that point and evaluated the shaking ease. In addition, we compared with the disaster hazard information of history. As a result of the above analysis, it can be seen that the difference in a more narrow range than the range of hazard information of history. with regard to the maximum speed ratio, the distribution of shaking ease every earthquake was different, with Fourier spectrum ratio, it did not change shape by earthquake. |
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