Faulting mechanism of the Gifu earthquake of September 9, 1969, and some related problems

Mikumo Takeshi

タイトル	en Faulting mechanism of the Gifu earthquake of September 9, 1969, and some related problems
作成者	en Mikumo, Takeshi
アクセス権	open access
権利情報	en © The Seismological Society of Japan en © The Geodetic Society of Japan en © The Volcanological Society of Japan
内容注記	Abstract en The faulting process of a moderate-size shallow earthquake on inland Japan, the central Gifu earthquake of September 9, 1969(M=6.6), has been investigated by synthesizing all available seismic and geodetic data. The focal mechanism solution based on data from Japanese and WWSSN stations and the spatial distribution of aftershocks indicate that the earthquake was caused by left-lateral strike-slip motion along a vertical fault plane with dimensions of 20 by 10km striking in the N30°W direction. The strong-motion records from five JMA stations within a distance of 80km are compared with the synthetic seismograms computed from dynamic dislocation models. The comparison yields estimates for the seismic moment, average fault displacements, rise time, and rupture velocity. The pattern of vertical tectonic movements from pre- and post-earthquake leveling data along two nearby routes is generally consistent with that derived from the corresponding static models, but there is some possibility that displacements over the northwestern part of the fault might be considerably larger than the average. The strain steps that have been recorded during the earthquake on 23 strain meters at ten crustal movement observatories are not always consistent with theoretically expected values. In relation to the faulting process, pre-earthquake data from leveling and tiltmeter observations are also examined from the viewpoint of earthquake prediction, and tectonic implications of the earthquake are discussed.
出版者	en Seismological Society of Japan(日本地震学会) / Geodetic Society of Japan(日本測地学会) / Volcanological Society of Japan(日本火山学会)
日付	Issued1973
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2433/193385
関連	isIdenticalTo DOI https://doi.org/10.4294/jpe1952.21.191
収録誌情報	PISSN 0022-3743 NCID AA00704960 en Journal of Physics of Earth 巻21 号3 開始ページ191 終了ページ212
ファイル	fulltext jpe1952.21.191.pdf (application/pdf)
コンテンツ更新日時	2026-02-18