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Report No.
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Estimation of crustal structure in Horonobe area, Hokkaido, Japan, by using Multiplet-Clustering analysis

Moriya, Hirokazu*; Asamori, Koichi; Kitamura, Itaru*; Hotta, Hikaru*; Ohara, Hidefumi*; Niizato, Tadafumi  

Hypocenter locations of shallow earthquakes in Horonobe area were determined to reveal the mechanisms of earthquake occurrence. The absolute source locations of 211 earthquakes were determined; then, those earthquakes with similar waveforms were identified, and the source locations of 26 multiplet groups were relocated by using cross-spectrum and clustering analyses. The relocated hypocenters allowed two seismically active areas to be identified, at 10-20 km and around 25-30 km depth. The earthquake locations indicate structures trending nearly N-S, and the structures causing repeated stick-slips at asperities, thus generating similar earthquakes.

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