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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: 観測記録に基づいたスラブ内地震の短周期レベル
Other Titles: Short-period Spectral Level of the Intra-slab Earthquakes from Strong Motion Records
Authors: 池田, 孝1 Browse this author
Authors(alt): IKEDA, Takashi1
Issue Date: 19-Mar-2010
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 73
Start Page: 71
End Page: 85
Abstract: Acceleration source spectra of three intra-slab earthquakes which occurred recently were evaluated by eliminating the effects of propagation path and site characteristics from observation records. Short-period spectral level A were evaluated from the acceleration source spectra, and stress parameters Ao were calculated from A and seismic moment M0. The relationship between Ao, focal mechanism, regionality, location, M0, and focal depth were examined. Ao of intra-slab earthquakes was not much affected by focal mechanism, regionality in the Pacific plate. The effect of location and focal depth to Ao is not clear, but Ao is not dependent on focal depth for medium and large earthquakes in the Pacific plate. Upper level of Ao is not affected by M0 and is 40-80 MPa. But lower level of Ao is affected by M0, that is, lower than 5 MPa for small earthquakes(M0<5 ×1017 Nm), 20- 80 MPa for medium earthquakes(5 ×1017 Nm<M0<1×1019 Nm), and 60-80 MPa for large earthquakes( M0>1 ×1019 Nm).
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第73号

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