Ground Motion Simulation in Anamizu Town during the 2007 Noto-Hanto Earthquake

Abstract eng:
We attempted to illustrate the building damage in the central region of Anamizu town by characteristics of earthquake ground motion and subsurface structure. We conducted the microtremor observation and calculated H/V spectra, the peak frequency of which is about 1Hz in the southeastern area and 1.5~3.0Hz in the western area. Then we estimated the subsurface structure in the central region of Anamizu town simulating the peak frequency of H/V spectrum, and found non-uniformity of the depth of subsurface structures ,which is ranging from almost 0m to around 20m. And we estimated the earthquake ground motion in the central region of Anamizu town using equivalent linear analysis. Based on these estimations, we presumed that (1) the amplitude of a little over 1Hz of the estimated earthquake ground motion coincides with the building damage level, and, (2) earthquake ground motion might be affected by the 2- or 3-dimesional topographical effect.

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