A seismological overview of long-period ground motion |
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| Authors: | Kazuki Koketsu Hiroe Miyake |
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| Institution: | (1) Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan |
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| Abstract: | Long-period ground motion has become an increasingly important consideration because of the recent rapid increase in the number
of large-scale structures, such as high-rise buildings and oil storage tanks. Large subduction-zone earthquakes and moderate
to large crustal earthquakes can generate far-source long-period ground motions in distant sedimentary basins with the help
of path effects. Near-fault long-period ground motions are generated, for the most part, by the source effects of forward
rupture directivity. Far-source long-period ground motions consist primarily of surface waves with longer durations than near-fault
long-period ground motions. They were first recognized in the seismograms of the 1968 Tokachi-oki and 1966 Parkfield earthquakes,
and their identification has been applied to the 1964 Niigata earthquake and earlier earthquakes. Even if there is no seismogram,
we can identify far-source long-period ground motions through the investigation of tank damage by liquid sloshing. |
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| Keywords: | Far-source long-period ground motion Near-fault long-period ground motion Source effect Path effect Site effect Liquid sloshing |
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