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| | Abstract | | Heavy damage was experienced in Hakuba village, Nagano prefecture during the 2014 Nagano-ken Hokubu earthquake. In particular many wooden houses were collapsed at Horinouchi, in the village. Characteristics of ground shaking during the main shock are not known in the area due to no availability of strong motion records. However, it has been known that this area was suffered in past several earthquakes. This suggests site amplification may be one of the reasons for the heavy damage during the earthquake. We conducted aftershock observation area and microtremor exploration at 13 station in the damaged to estimate site effects. Ground motion at periods of 0.5 to 1 second is dominant in the damaged area. Shallow soil down to 30 meters are responsible for the amplification. We also found a lateral variation of the shallow S-wave velocity near the Kamishiro fault. |
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