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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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~48 Katsuyuki AbeSieh (1978) and o<strong>the</strong>rs list <strong>the</strong> earthquake originating at Parkfield on March 21,23:45 (PST), 1901. No Milne data have been found for this shock. Ample evidenceindicates that <strong>the</strong> actual date is March 2 in PST or March 3 in GMT (McAdie, 1907;BAAS, 1911; Townley and Allen, 1939). The Milne data for this shock (CA05) areshown in Table 5. Similarly, <strong>the</strong> actual date for <strong>the</strong> earthquake of October 28,1909, in Richter (1958), is October 29. The earthquake of CA07 is not listed byToppozada et al. (19781, because it originated in nor<strong>the</strong>rn Baja California. Richter(1958) assigned magnitude 7+. The Milne data give Ms = 6.6, as shown in Table 6.The San Francisco earthquake of April 18, 1906 (CAll), was formerly assignedMGR = 8 i by Gutenberg and Richter (1954), and later revised to be Ms = 7.8<strong>from</strong> <strong>the</strong> Milne data by Abe and Noguchi (1983). The station corrections have beenincorporated in <strong>the</strong> present estimate, and <strong>the</strong> previous value of Ms = 7.8 has beenunchanged to a tenth of a unit.Table 5. Parkfield Earthquake of March 3, 1901S tat ion Distance ArrivaltimeOrigintimeA MS(ded (hr:mn) (hr:mn) (mm)VictoriaTorontoEdinburghEdinburghBidstonKewShideAverage12.5 07:42.5 07:45.032.2 08:06.4 (07:47.2)74.1 08:26.6 07:42.374.1 08:28.5 07:44.275.8 08:26.2 07:40.978.4 08:22.0 (07:35.1)78.5 08:26.2 07:39.307~42.3Values in <strong>the</strong> paren<strong>the</strong>ses are not used in <strong>the</strong> average.8.00.61.00.750.30.50.5Table 6. Baja California Earthquake of January 24, 1903(6.66)6.106.776.646.1 16.356.17Station Distance ArrivaltimeOrigintimeA MS(ded (hr:mn) (hr:mn) (mm)VictoriaTorontoBaltimoreEdinburghBidstonCordobaShideShideShideKewSan FernandoIrkutskTiflisPerthAverage17.930.932.175.777.279.379.779.779.779.785.489.6104.8136.705:41.505:48.105:4706:10.506:09.506:20.906: 15.106:13.2OG: 12.206:18.506:16.0Ok22.206:29.606:5505:30.805 :29 .G05:27.805:25.2(05 :23.3)(05 :33.5)05:27.505:25.6(05:24.6)05 :30.905:24.905:28.605:26.9(05 :33.3)05:27.8Values in <strong>the</strong> paren<strong>the</strong>ses are not used in <strong>the</strong> average.6.12 .o11.o.o1.01.20.71 .o0.90.50.256.366.80G.GO6.786.656.486.566.326.676.446.606.676.g0

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