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| | Abstract | | On April 13, 2013, an inland crustal earthquake (Mw5.8) occurred in the Awaji Island, which is close to the southern boundary of the aftershock area of the 1995 Kobe earthquake. 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. 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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