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| | Abstract | | On September 6, 2018, Hokkaido eastern Iburi earthquake (Mw6.6) caused large ground motions with peak ground acceleration greater than 500 cm/s2 at several strong motion stations around the source area. 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 three stations (KiK-net Chitose, Mombetsu-W, and Atsuma) 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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