Taking into account an idea of Farthquake Province proposed by C. Tsuboi, we have derived twelve geographical regions from data for the earthquakes of magnitudes larger than 4 which occurred in and near Japan from 1926 to 1956.
We applied a statistical test on null hypothesis to a problem on correlations between magnitude and depth, and between magnitude and time, and divided the data for earthquakes in each one of these twelve regions into two or three classes by next criterions, i. e., 0-30 km and 40-60km depths, and before, in, and after the year in which the largest earthquake occurred for these thirty one years.
Some correlations between magnitude and depth for regions off Fukushima Prefecture and off Tokati were found, and between magnitude and time, for every regions.
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