活断層研究
Online ISSN : 2186-5337
Print ISSN : 0918-1024
ISSN-L : 0918-1024
横ずれ活断層の累積変位量・断層長・破砕帯幅から見た断層の発達度-中国地方と中部地方の比較
松田 時彦岡田 真介渡邊 トキエ
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ジャーナル フリー

2004 年 2004 巻 24 号 p. 1-12

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Three factors, the cumulative slip, the fault length and the width (thickness) of the crushed zone, are examined to compare the development of active strike-slip faults in Chugoku and Chubu districts. The cumulative slips since the latest Cretaceous in the both districts are about the same, but the slips of Quaternary are distinctly smaller in Chugoku than in Chubu, indicating the different growth history during Tertiary and Quaternary. Lengths of the major fault zones are similar in both districts, but the ratio of the frequency distribution of shorter faults to the longer ones is larger in Chugoku. In general, the widths of crushed zones are smaller in Chugoku than in Chubu. The length of fault zones and the width of crushed zones are both proportional to the Quaternary slip, implying the former two are mainly products of the Quaternary.
Origin time of the late Quaternary faulting of these active faults is about the same (ca. l Ma ) in both districts, since the long-term slip rate in late Quaternary is much smaller in Chugoku than in Chubu.
The Chugoku district is about the same as the Chubu in the development of the fault in respect to cumulative slip since the latest Cretaceous. However, it is less developed in Quaternary time than Chubu district as indicated by the smaller amount of the Quaternary slip and the width of crushed zones as well as the relative abundance of the shorter faults.

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