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

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18 Hiroo KanamoriTable Ib. Some Large Earthquakes With Mw Around 8Date Time Region Lat. Long. Ms Mw1958 07 10 06 15 561966 10 17 21 41 571969 08 11 21 27 361970 05 31 20 23 281974 10 03 14 21 291975 05 26 09 11 521976 08 16 10 11 051978 11 29 19 52 491979 12 12 07 59 031980 07 17 19 42 231985 03 03 22 47 07AlaskaPeruKurile Is.PeruPeruAzoresMindanao Is.MexicoColombiaSanta Cruz Is.Chile58.3-10.743.4-9.2-1 2.236 .O6.216.11.6-12.5-33.1-130.5-78.6147.8-78.8-77.6-17.6124.1-90.6-79.4165.9-71.97.9 7.77.8 8.17.8 8.27.6 7.97.6 8.17.8 7.77.8 8.17.6 7.07.6 8.27.7 7.97.8 8 .OTable 2. Frequency-Magnitude Relation, 1004-1980IntervalCumulativeFMs < nl n2 Ms 2 NI N27.0 7.2 252 252 7 .O 7207.2 7.4 162 162 7.2 4687.4 7.6 104 104 7.4 3067.6 7.8 97 97 7 .G 2027.8 8.0 52 52 7 .a 1058.0 8.2 25 22 8 .o 538.2 8.4 17 13 8.2 288.4 8.6 8 10 8.4 118.6 8.8 3 3 8 .6 38.8 9.0 1 8.89.0 9.2 2 9 .o9.2 9.4 1 9.29.4 9.6 1 9.472046830620210553311885421Note:(1) nl is <strong>the</strong> number of events within <strong>the</strong> magnitude range of .2 for <strong>the</strong> period 1904 to1980.(2) n2 is <strong>the</strong> same as nl in (1) with Ms replaced by MW for <strong>the</strong> ten largest events withhfw 2 8.5 listed below.(3) N1 is <strong>the</strong> total number of events larger than <strong>the</strong> given Ms for <strong>the</strong> period 1904 to 1980.(4) N2 is <strong>the</strong> same as N1 in (3) with Ms replaced by Mw for <strong>the</strong> ten largest events withMw 2 8.5 listed below: 1900 Chile (Ms = 8.5;Mw = 9.5), 1904 Alaska (8.4; 9.2),1957 Aleutian Is. (8.1; 9.1), 1952 Kamchatka (8.2; 9.0), 1906 Colombia (85; 8.8), 1965Aleutian Is. (8.2; 8.7), 1950 Assarn (8.6; 8.0), 1938 Bands Sea (8.2; 8.5), 1963 KurileIs. (8.1;8.5), 1922 Chile (8.3; 8.5).For most events which occurred after 1060, a relatively complete set of seismograinsis available for detailed studies, but for <strong>the</strong> events prior to 1960, <strong>the</strong> data areusually incomplete. In many cases, only a few records at most were used for <strong>the</strong>determination of <strong>the</strong> source parameters. There are still many unresolved problems.The solution of <strong>the</strong>se problems requires more complete sets of seismograms.

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