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| | Abstract | | On December 28, 2016, an inland crustal earthquake (Mw5.9) occurred in the northern Ibaraki prefecture. Several strong motion stations recorded large ground motions with peak ground acceleration greater than 500 cm/s2. For understanding the mechanism of these large ground motions during this earthquake, we focus on the site characteristics and their contributions to strong ground motions. Microtremor array observations and single-station microtremor observations are conducted for four stations which recorded large ground motion near the source area. From the obtained phase velocities and H/V spectra, we estimate the underground velocity structure models and discuss their effects on strong ground motions. |
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