Recurrence interval of big earthquakes along the Atotsugawa fault system, central Japan: Results of seismo‐geological survey
Recurrence interval of big earthquakes along the Atotsugawa fault system, central Japan: Results of seismo‐geological survey
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日本中部原子川断层系大地震的复发间隔：地震地质调查结果
DOI：
10.1029/2002gl014957
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发表时间：
2003
影响因子：
5.2
通讯作者：
Takebe Akimitsu
中科院分区：
文献类型：
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作者：
A. Takeuchi;Hasbaator Ongirad;Takebe Akimitsu
原子津川断层系（AFS）是日本中部右旋走滑断层的活动区，以微地震高地震活动为特征。我们对该系统的三个地点进行了地震地质研究。一个位于原子津川主断层 (AGF) 的中部，一个位于末端，另一个位于分支 Mozumi-Sukenobe 断层 (MSF) 上。挖沟调查显示，最大复发间隔为 3,000 年，与中央 AGF 的复发间隔（2,500 年）相似。这可能表明，尽管较浅的 AGF 存在明显的分割，但震源区的行为是一致的。无国界医生组织的另一项地质切片调查描绘了 13,500 年的稀缺间隔，大约是主断层间隔的六倍。 AGF 和 MSF 上同时发生了两起事件，时间为公元 1858 年，距今约 17,300 年前，这表明 AFS 的主断层和分支断层之间存在间歇性协作。
The Atotsugawa fault system (AFS), characterized by high seismicity of micro‐earthquakes, is an active zone of right‐lateral strike‐slip faults in central Japan. We carried out seismo‐geological studies of three sites on the system. One is in the middle of the master Atotsugawa fault (AGF), one is at the end, and another is on a branching Mozumi‐Sukenobe fault (MSF). Trenching surveys demonstrated a maximum recurrence interval of 3,000 years, which is similar to that of the central AGF (2,500 years). This might indicate a uniform behavior in the seismogenic zone, despite the apparent segmentation in the shallower AGF. Another geo‐slicing survey at MSF depicted a scarce interval of 13,500 years, about six times longer than that of the master fault. Two simultaneous events on both AGF and MSF occurred in 1858 A.D. and at about 17,300 years ago, suggesting an intermittent cooperation between the master and branch faults of AFS.