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

On the Seismicity of the Middle East 329Table 5. Magnitude-Magnitude Relations for Selected Areas in the Middle EastRegion Relation Standard No. of Locationdeviation events used341 Ms = 1.935 mb - 4.981346 Ms = 2.333 mb - 7.534347 Ms = 2.058 mb - 5.948348 Ms = 1.542 mb - 2.828353 Ms = 1.253 mb - 1.379366 Ms = 1.420 mb - 2.118415 Ms = 0.440 mb + 2.817417 Ms = 1.504 mb - 2.836553 Ms = 2.500 mb - 8.380554 Ms = 1.891 mb - 4.679558 Mc = 1.339 mh - 1.8620.8640.6550.4830.5950.4370.4890.6430.3560.6980.4500.398371139404315165720Iran-USSRIran-IraqW. IranIranS. IranTurkeyE. Gul. AdanArabian SeaEUPtRed SeaEthiopiaTable 6. Magnitude-Magnitude-Intensity Relations for TurkeyParameters Relation No. of Remarksevents usedMs = 1.420 mg - 2.118Ms = 0.792 ML + 1.434ML = 1.214 mb - 1.088ML = 0.332 I. + 3.160ML = 0.325 I0 + 2.830ML = 0.369 I. + 2.680ML = 0.332 I. + 3.100ML = 0.446 I,, + 2.540ML = 0.456 I, + 2.630ML = 0.209 I0 + 4.300ML = 0.332 I0 + 1.187 Log h + 1.665431011115132625301011All depthsh 5 1010 < h 5 1515 < h 5 2020 < h 5 3030 < h 5 40h > 40h 2 100The magnitude-intensity relations for the Middle East have been determinedusing 438 events in the formandML = 0.51, + 1.36logh - 0.133 zt 0.44(3)ML = 0.51, + 1.58.Plots showing relation (3) is given in Figure 4.(4)4. Recurrence Rate RelationsThis kind of relation has become a basic approach in statistical seismology. Theoriginal form for the magnitude-frequency relation proposed by Gutenberg andRichter (1954) is:logN = a + b (8 - ML). (5)However, many authors express the magnitude-frequency relation in the form(Kbrnik, 1969) :logN = a + b ML, (6)