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Res., 85,3817,1980) using Claerbout\u0027s Robust modelling (CLAERBOUT and MUIR : Geophysics, 38,826,1973). Corrections for physical dispersion and instrumental response were made by a simple method same as that of CHUNG and KANAMORI (Phys. Earth Planet. Inter., 23,134,1980). Conclusions are as follows : (1) Events for which fault plane solutions were well-constrained were all left-lateral strike-slip fault events, which is consistent with the concept of the transform fault. (2) Total amount of the seismic moments released at the Eltanin FZ, the Pacific-Antarctic Ridge, is 6-7×(10)^\u003c26\u003edyn・cm, including all of the TF events of the surface wave magnitude Ms greater than 5.8. The estimate is 8-10% of an amount of 7.5×(10)^\u003c26\u003edyn・cm predicted by a simple plate kinematics with parameters of a TF length of 1300km, a crustal thickness of 10km, a rigidity of 4×(10)^\u003c11\u003edyn・cm, a spreading rate of 9cm/yr and the period of 16 years. This indicates that the main part of transform fault movements was released aseismically at the Eltanin FZ. 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Mode of seismic moment release at the Pacific-Antarctic Ridge (abstract)
https://nipr.repo.nii.ac.jp/records/1467
https://nipr.repo.nii.ac.jp/records/1467fb1b2588-882c-4ae3-bc67-2994d811e0f9
名前 / ファイル | ライセンス | アクション |
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KJ00000012100 (69.1 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1983-10-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Mode of seismic moment release at the Pacific-Antarctic Ridge (abstract) | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Kawasaki, Ichiro
× Kawasaki, Ichiro× Kawahara, Yasutoshi |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Toyama University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Toyama University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | This paper presents an analysis of transform fault (TF) events along the Eltanin fracture zone (FZ) and the Udintsev FZ, the Pacific-Antarctic Ridge. We redetermined fault plane solutions and seismic moments of 12 TF events by moment tensor inversion (FITCH et al. : J. Geophys. Res., 85,3817,1980) using Claerbout's Robust modelling (CLAERBOUT and MUIR : Geophysics, 38,826,1973). Corrections for physical dispersion and instrumental response were made by a simple method same as that of CHUNG and KANAMORI (Phys. Earth Planet. Inter., 23,134,1980). Conclusions are as follows : (1) Events for which fault plane solutions were well-constrained were all left-lateral strike-slip fault events, which is consistent with the concept of the transform fault. (2) Total amount of the seismic moments released at the Eltanin FZ, the Pacific-Antarctic Ridge, is 6-7×(10)^<26>dyn・cm, including all of the TF events of the surface wave magnitude Ms greater than 5.8. The estimate is 8-10% of an amount of 7.5×(10)^<26>dyn・cm predicted by a simple plate kinematics with parameters of a TF length of 1300km, a crustal thickness of 10km, a rigidity of 4×(10)^<11>dyn・cm, a spreading rate of 9cm/yr and the period of 16 years. This indicates that the main part of transform fault movements was released aseismically at the Eltanin FZ. The conclusion (2) seems to be a proof for the conclusion that the fast-spreading center like the Pacific-Antarctic Ridge is hot and plastic because hot mantle materials are being supplied by the fast-moving mantle-convection current. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 28, p. 68, 発行日 1983-10 |