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A total of 6 earthquake sequences that occurred in the Kuril Islands region in 1964~1976 has been collected andtheir characteristics have been analyzed. When these sequences are judged from the spatial relation between theirsource distribution and the subduction zone, all of them belong to plate boundary earthquake sequences. Theparameters of 5 ones among these sequences, which are located just in the subduction zone, are in fair agreement.For these 5 sequences, the major axis of epicenter distribution area is longer; the ratio of major axis to minor axisis high; the focal depths have a greater range; the directions of dip are consistent with the direction of subduction;the dip angles are of moderate value. It is estimated that the only exception is related to the low accuracy of data inthe early stage.
A total of 6 earthquake sequences that occurred in the Kuril Islands region in 1964 ~ 1976 has been collected and their characteristics have been analyzed. When these sequences are judged from the spatial relation between theirsource distribution and the subduction zone, all of them belong to plate boundary earthquake sequences. Theparameters of 5 ones among these sequences, which are located just in the subduction zone, are in fair agreement. For these 5 sequences, the major axis of epicenter distribution area is longer; the ratio of major axis to minor axisis high; the focal depths have a greater range; the directions of dip are consistent with the direction of subduction; the dip angles are of moderate value. It is estimated that the only exception is related to the low accuracy of data inthe early stage.