SPACE-TIME PATTERN OF LARGE EARTHQUAKES OCCURRING OFF THE PACIFIC COAST OF THE JAPANESE ISLANDS
SPACE-TIME PATTERN OF LARGE EARTHQUAKES OCCURRING OFF THE PACIFIC COAST OF THE JAPANESE ISLANDS
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日本列岛太平洋沿岸发生大地震的时空格局
DOI：
10.4294/jpe1952.22.325
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
T. Utsu
中科院分区：
文献类型：
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作者：
T. Utsu
根据日本太平洋沿岸6级以上大地震发生的空间、时间和震级的分布规律，将地震活动强烈区划分为几类。在A型地区，大地震的发生间隔相当有规律。在B类地区，震级高达7.5级左右的大地震往往成群发生。在A'型地区，偶尔会发生震级高达7.5级的大地震。存在标记为AB型、A 'B型、A（B）型、（A）B型等的区域。AB型意味着A和B的混合型。A（B）型代表A型，略具B型特征。对每种类型地区的地震发生模式的研究，为大地震的统计预测提供了有用的信息。对于A类地区的大地震，前震活动通常较弱，但如果观测到前震，则识别前震可能更容易，因为大地震前存在一个显著的地震活动空区。在B、（A）B和AB型地区，没有大地震活动空区并不能保证在不久的将来不会发生大地震。B类和（A）B类地区发生大地震后，连续发生大地震的可能性很大。在A、A、B和B类地区发现的大地震空区并不是未来大地震的征兆。在类型B、（A）B和A 'B的区域中的群体通常具有低b值。因此，低b值不是这些地区前震的判据。在每次大地震发生前的50年期间，在大地震震源区内侧的日本陆地地区，沿南海海槽沿着，破坏性地震的数量显著增加。
The regions of intense seismic activity off the Pacific coast of Japan are classified into several types according to the pattern of occurrence of large earthquakes (M≥6) in space, time, and magnitude. In type A regions, great earthquakes occur at fairly regular intervals. In type B regions, large earthquakes of magnitude up to about 7.5 tend to occur in swarms. In type A' regions, large earthquakes of magnitude up to about 7.5 occur sporadically. There are regions labeled as type AB, A'B, A(B), (A)B, etc. Type AB means a mixed type of A and B. Type A(B) represents a type A with slight indication of the character of type B.Investigations of the pattern of occurrence in regions of each type provide useful information for the statistical prediction of large earthquakes. For great earthquakes in type A regions, foreshock activities are usually weak, but the identification of foreshocks, if they are observed, may be easier, because a remarkable seismicity gap is developed before a great earthquake. In regions of types B, (A)B, and AB, the absence of a seismicity gap for large earthquakes does not assure the non-occurrence of a large earthquake in near future. The probability of the successive occurrence of large earthquakes is high after the occurrence of large earthquake in regions of types B and (A)B. A seismic gap for great earthquakes found in regions of types A' A'B, and B is not an indication of a future great earthquake. Swarms in regions of types B, (A)B, and A'B usually have low b-values. Therefore a low b-value is not a criterion for foreshocks in these regions. A remarkable increase in number of destructive earthquakes in the land area of Japan on the inner side of the source regions of great earthquakes along the Nankai trough is recognized during a 50-year period prior to the occurrence of each great earthquake.
影响因子：
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作者：
KELLEHER, J;SYKES, L;OLIVER, J
通讯作者：
OLIVER, J