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

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<strong>Historical</strong> <strong>Seismograms</strong> in Belgium 231<strong>AD</strong>DENDUMTable 6, which follows, supersedes Table 4. It includes additional amplitudeperioddata for <strong>the</strong> Belgian earthquake of 11 June 1938 supplied by Prof. N. Ambraseys.Where Lg-phases are shown, MS values were calculated using <strong>the</strong> calibrationcurves derived for Northwestern Europe (Ambraseys, 1985). Where Lrn isshown, magnitudes were estimated <strong>from</strong> <strong>the</strong> Prague formula.The average value of Ms for <strong>the</strong> Belgian earthquake of 11 June 1938 in Table 3<strong>from</strong> 10 stations is 5.3 (i 0.17). For <strong>the</strong> data in Table 6, with station correctionsderived by Kknik, we find <strong>from</strong> 17 station estimates, 5.0 (& 0.27).Table 6. Period and Amplitude Data for <strong>the</strong> Earthquake of 11 June 1938ParisParisBochumKewStrasbourgStrasbourgKarlsruheGGttingenS tu t t gartB2leNeuch ate1ZurichHamburgHamburgJenaEgerMunichEdinburghCopenhagenViennaOgyallaPulkovo2332332 6628238838840045346146348852653356262264472179996696610991944WWP17WAWGMWWWWW’W’GQQQQWWWWWWWWWmGWWMG53.042.015.514.53.88.37.03.51.73.51.60.83.64.5170.0 1.0170.0 1.152.0 1.374.0 *80.0 2.890.0 3.072.0 2.512.5 20.3 0.313.8 1.012.5 1.022.5 319.5 1.613.5 *18.0 4.480.07049739890 .o27130.513.513.815.82140.511.411.5241.0 5.521.11.3 5.14* 5.423.23.5 5.202.5 5.082.00.31.0 4.961.22.94.0 4.591.9 5.051.8 4.641.7 4.723.616.0 5.0 22.0 4.0 5.208.5 2.110 2.52.0 3.0 2 .o 1 .o15.0 2.0 2 .o 2.0 4.6810.0 2.020.0 6.0 20.0 6.0 5.2221.0 5.5 17.5 3.7 5.3412.8 4.04.6613.0 3.0 4.9617.0 3.3 21 3.332.1 4.24 .O 17.0Lm 1.0 10.0 4.46Instruments: w = normal Wiechert (100 kg); W = big Wiechert (15 ton); w’ = verylight Wiechert (I0 kg); P17 = 17 ton pendulum; M = Mainka; W.A. = Wood-Anderson;G = Galitzin; Q = Quervain-Picard; m = Milne-Shaw. The symbol ( * ) indicates that<strong>the</strong> period of groundmotion is unreadable. (All, Tv), (AN, TN), (AE, TE) are <strong>the</strong>amplitudes and periods read on <strong>the</strong> vertical, North-South and East-West components of<strong>the</strong> seismograms.

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