The 2008 Iwate-Miyagi Nairiku earthquake (Mw 6.9, Mjma 7.2) occurred in southwestern Iwate Prefecture, Japan (39.03°N, 140.88°E, depth 8 km), on 13 June, at 23:43:45 GMT (Japan Meteorological Agency 2008). The surface accelerometer of KiK-net station IWTH25, located 3 km southwest of the epicenter, produced one of the largest strong-motion values of peak ground acceleration (PGA) ever recorded (4278 cm/s2 for the vector sum of the three components [Kik-net 2000]) and exhibited an asymmetric amplification in the vertical component (Aoi et al.). This asymmetric amplification has been interpreted to be a...

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