測地学会誌
Online ISSN : 2185-517X
Print ISSN : 0038-0830
ISSN-L : 0038-0830
1933年三陸沖地震の地殻変動
藤井 陽一郎
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ジャーナル フリー

1977 年 23 巻 2 号 p. 74-81

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Most of abrupt coastal upheaval associated with earthquake are interpreted as result of reverse faulting with low dip angle. The results of levelling suggest a possibility that seismic crustal upheaval along the coast of Sanriku, northeast Japan, were associated with the 1933 Sanriku-oki earthquake with magnitude 8 .3, although the earthquake is normal faulting on the Japan trench. In order to test whether the earthquake could have given coastal upheaval or not, crustal movements are calculated with the following fault parameters for the 1933 Sanriku-oki earthquake;Strike of fault N3°ELength of fault 300 kmWidth of fault 100 kmDip angle 45°Normal slip 6.6 m The results show a 4-6 cm seismic upheaval along the Sanriku coast and horizontal crustal strain with 2-4×10-6 in the east and middle part of northeast Japan . This normal faulting of the 1933 earthquake gave additional crustal strain and would be a trigger of some geophysical phenomena such as earthquake swarms or occurrence of deep earthquakes.
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