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

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

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

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78 S. K. SinghJdFJ-22 Feb 1943Ms=7.7XMo=0.45x1027 dyne-cm14 Dec 1950M,=7.327JI CM0=0.58x10 dyne-cmHM =3.12x10e7dyne-cmLn 28 Jul 1957Ms-7.718 Jun 1932MS = 8.0VJ ZMo=0.85x1OZ7dyne-cm1 min]l~lO*~ dyne-cmI11 May 1962MsZ7.2ZMo=2.1 xIOe7 dyne-cmJ1 PRESS-EWING UPPI*-1 rnin23 Dec 1937Ms'7.7IMo-0.4 x102' dyne-cm1I Mo=0.44 x loe7 dyne-cm19 May 1962Ms=6.9/1sc-L. ZMo=0.20 x1OZ7 dyne-crnFigure 8. Observed (above) and syn<strong>the</strong>tic (below) P-wave pairs of some large Mexicanearthquakes. The number of subevents, <strong>the</strong>ir seismic moments, <strong>the</strong> time at which each acts,and <strong>the</strong> total seismic moment are indicated below each pair. The source parameters aregiven in detail in Singh et al. (1984b). Only <strong>the</strong> 1937 and <strong>the</strong> 19GZ earthquakes requireone source; o<strong>the</strong>r earthquakes are complex and require multiple sources. That part ofobserved trace which is not clear in <strong>the</strong> seismogram is shown by broken line. (From Singhet a/., 1984b).

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