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A quick estimation of spatial and temporal hypocenter distributions in swarms and aftershocks is essential for taking measures to mitigate earthquake disaster. The automatic hypocenter determination method is important to understand seismic activities in real time. We developed a new method to identify multiple concurrent earthquakes for the Seismological Bulletin of Japan. This method makes integrated use of P-and S-wave arrival times and maximum amplitude. We applied this method tofatcat:wvcdeumaqrhcvpcqcwgva75oha