2019 Volume 19 Issue 1 Pages 1_68-1_81
Strong ground motions recorded by the servo velocity seismographs deployed in Minoh City during the earthquake in Osaka-Fu Hokubu on 18 June 2018 (MJMA 6.1) were shown and compared with that published by public institutions in the neighboring region. Furthermore, the velocity records were partially clipped because ground motions exceeded the limitation of measurement of the seismograph, therefore the clipped records were restored using the newly proposed method.
It was shown that the area evaluated as JMA Seismic Intensity level 6 lower and/or approximately up to 100 cm/s in 5% pseudo velocity response spectrum may extend to Kayano located in the central part of Minoh City. It was found from the analysis results such as the band-pass filtered waveforms at a frequency band of 0.3-0.8 Hz, its particle motions, and the Fourier spectral ratios to an observation site located in the mountain area that, in the later phase behind the direct S-wave part, the amplitude in the east-west direction is greater than that in the north-south direction at the observation sites in the graben region.
