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(A) Distribution of stations and seismicity (98/10/01–99/05/31) in central Japan. MTS, HKB, and OTA recorded the change on 99/01/17, whereas other stations did not. The arrow and the number attached to each station are the change vector and epicentral distance. (B) The change simultaneously observed at the three stations on 99/01/17. dp, dipole.
