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Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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116 Deli Cheng, Yushou Xie, and Zhifeng DingMSI /7.06.0Iy = 0.934n =69---MSMV1_5.0 6.0 7.0 MVla3Mv-Ms- - - - *- ’ 7 7 -- .. .- - - - - .-0.18.Cb30- --0.2- z-0.4 cFigure 1. (a) Ms vs. Mv (Moscow-Prague) curve; (b) Deviation of MV <strong>from</strong> Ms.in Table 1. After 1940, maximum amplitudes without corresponding periods werelisted in <strong>the</strong> “Bulletin of Seismic Stations of U.S.S.R.” For A 2 15’, magnitudeswere calculated using formula (1) with <strong>the</strong> amplitude multiplied by a. WhenA < 15’, <strong>the</strong> following formula (Kondorskaya and Shebalin, 1977) supplementedformula (3):where A is in km.Ms = log A + 1.32 log A, (4)

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