Behavioral segments and their cascades for the earthquake occurrence in the Japanese surface ruptures-Tentative Study-

Author: Yasuo Awata

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Abstract: 15 surface ruptures on land in Japan are subdivided into 23 behavioral segments, based on timing of paleofaulting, long-term slip rate, and fault geometry. Relations between the lengths of behavioral and earthquake segments, and the maximum displacement are shown as follows:
Lb-seg = 4.9×Dmax and Le-seg = 9.0×Dmax, where Lb-seg is a behavioral segment length, Le-seg is a earthquake segment length in kilometer, and Dmax is a maximum displacement of segment in meter. The cascade ratio, the ratio of
an earthquake segment length to the length of maximum behavioral segment in the earthquake segment, is 1.8 for Japanese surface ruptures. These relationships are applicable to make a segmentation of the active faults, and to evaluate the cascades for the earthquake occurrence in Japan. In this application, it is considered that the maximum displacement is 1.5 to 2 times as large as the most-frequently-occurring displacement in the behavioral segment.

Relations between earthquake segment length and behavioral segment length,and maximum displacement in the segment.

Earthquake segments and their behavioral segments of the Japanese inland surface ruptures [PDF 10KB]