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We investigated the strong ground motions and the damage of buildings near the coseismic surface faulting of the 2011/04/11 Fukushima-ken-Hama-Dori Earthquake (the April 2011 Fukushima earthquake, Mw 6.6). First, we confirmed that the ground motions from this normal fault were equivalent and/or stronger than the thrust fault, by comparing the strong motion records with the attenuation relation. We also checked that the ground motions near the epicentral area were larger than those of the 2011/03/11 Great Tohoku earthquake (Mw 9.0). Therefore, the most of building damage was probably caused by the 2011 April Fukushima earthquake. Next, we investigated that the 191 buildings near the surface faulting (within 500 m), and obtained the following conclusions. The most of severe damage was caused by the surface faulting and the subsequent ground failure. Among 9 buildings above the surface faulting, only one building was overturned; the building was a traditional tall gate in a Budhism temple, and fell on the side by the surface faulting of about 60 cm dislocation, because the columns were not anchored to the foundations. As for the other buildings, the damage by the strong ground motion was negligible. That is, the rate of heavy damage (Damage Grade 4 and upper) was less than 2%, which corresponds to JMA Intensity 5and 6+, even though the most of buildings seemed very old and weak.

INVESTIGATION OF BUILDING DAMAGE NEAR THE SURFACE FAULTS OF 2011 FUKUSHIMA-KEN-HAMA-DORI EARTHQUAKE