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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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326 S. Riad, H. Meyers, and C. KisslingerYear195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983Magnotgiven00<strong>2000</strong>120021000000000000000000000Lessthan3.90000000000000000000000000000000003.9to4.4711201171310111117181128455610088627891866353378775125758769807189Table 2. (Continued )4.5to4.9141522198253120192028203030457067496562454952276847783133262323305.0to5.44711831112121413116141916221627212117372015301421111411149135.5to5.92423310592392485386134862253115452236.0 6.5 7.0 7.5 8.0 8.5to to to to to to6.4 6.9 7.4 7.9 8.4 8.91 2 0 0 0 00 0 0 0 0 02 2 1 0 0 00 0 0 0 0 02 2 0 0 0 05 1 1 1 0 02 2 6 0 0 01 2 0 0 0 03 1 0 0 0 05 0 0 0 0 05 1 1 0 0 01 0 2 0 0 02 3 1 0 0 03 0 1 0 0 00 0 0 1 0 03 2 2 0 0 04 3 1 0 0 01 1 1 0 0 04 0 1 0 0 00 1 1 0 0 00 0 1 0 0 04 1 0 0 0 00 0 0 0 0 01 0 1 0 0 02 3 1 0 0 02 0 1 0 0 01 1 1 0 0 03 0 0 1 0 c3 2 1 0 0 02 0 0 0 0 00 2 1 0 0 00 1 0 0 0 03 1 2 0 0 0Totals303762412567695750587543821 0612320218714718218015716012783196142238126144113122106141Totals 18 0 1889 1585 893 334 153 84 53 14 5 0 5028Many investigators have established mb/ML and mb/Ms relations for differentparts of <strong>the</strong> world. Some examples are given in Table 3. They show that <strong>the</strong>magnitude relations are different for various parts of <strong>the</strong> world.Using <strong>the</strong> data available in <strong>the</strong> Middle East catalog, relations between Ms andmb, MS and ML, Ms and M,, mb and ML were obtained (Table 4). Plots representingsome of <strong>the</strong> obtained relations are given in Figures 2 and 3. These relationswere used to assign a value for earthquake parameters not reported in <strong>the</strong> originalsources. Similar relations were also obtained for selected area in <strong>the</strong> Middle East(Table 5). They also show wide variations in <strong>the</strong> values of <strong>the</strong> constants, whichare probably due to <strong>the</strong> variations in <strong>the</strong> seismotectonic characteristics of each region.Special attention was given to Turkey, as <strong>the</strong> reported data provided moreinformation about earthquake parameters for this area.

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