Tab. 5.3 - Magnitude determination in the input PEC (1440-1899).

 PEC

Determination procedures (declared or inferred)

MUS94

       ML = 1.03 log A3 - 0.19

where A3 is the area enclosed in the isoseismal of 3° MSK

HOU92

The introduction to the catalogue states that in many cases it comes from the relation

       M = 2/3 Io + 1

Actually M, when given, is declared as taken from a given source

 VGL91

M taken from the input PEC used by Van Gils and Leydecker, 1991

LEY86

no magnitude determination

GRU88

Events without depth determination

       M = 0.63 Io + 0.5

Events with depth determination

       M = 0.5 Io + Log h + 0.5

POS85

Earthquakes without depth determination

       M = 0.53 Io + 0.95        Nord of        44° N

       M = 0.51 Io +1.0           South of        44° N

Earthquakes with depth determination:

       M = 0.051 Io +Log h +0.35

RIB82

       M = 0.66 Io + 1.7 Log h - 1.6 (1)

The relation which is found fitting the values of Mm/Io
for earthquakes without depth is

M = 0.518 Io + 1.42               [R^2 = 0.99]

Figures determined from the application of formula (1),
when compared with data reported in the catalogue, show differences
that seems to be due to the use of a different coefficient of the depth factor (1.7)

HER95

Magnitudes are taken from other catalogues

Earthquakes without depth fit in the equation

M = 0.5 Io + 1.12          [R^2 = 0.99]

Magnitudes of earthquakes with depth show a different behaviour

ZSA88

       M = 0.6 Io + 1.8 log h - 1.0        (1)

Figures for earthquakes without depth correspond to the relation

M = 0.6 Io + 0.8

This formula is obtained from (1) using a standard value of depth (10 km)

COM82

Magnitudes values of earthquakes without depth fit in the relation:

Mm = 0.52 Io + 2.62        [R^2 = 0.99]

SUK75

no magnitude determination

PAP89

2 relationships declared:

              I = 6.59 + 1.18 Ms - 4.50 log( D+17)        for shallow events               (1)

              I = 1.87 + 1.69 Ms - 3.94 log (D+30)        for intermediate events      (2)

As this are attenuation relations,
it has to be assumed that D (epicentral distance) was set = 0

SHA74

no magnitude determination

AHU9

Varied relationships for different zones:
1) Ma = 0.69 Io            + 1.78 log ha - 1.33                                    Bath
2) M = -1.33               +  1.78 log10R - 0.89l og(102(Io-2)/ü - 1) + 0.61Io  Husebye
3) M = 2.7                  +  logS                                      Ananin, Panasenko
4) MM (UP) = 0.38         +  1.14 log ri + 0.23 Io                        Wahlstrom, Ahjos
5) ML(A3) = - 0.5           + log10 (A3)
   ML(A4) = - 0.1         + log10 (A4)                                   Hvskov, Optun
6) MS = -0.36             + 1.00 log A (3)
   MS = 0.91               + 0.82 log A (4)                               Bungum
7) MS = 0.95              + 0.69 log A (3) + 0.0006 (A3)
8) MS = 1.57              + 0.63 log A (4) + 0.0007 (A4)                 Wood, Woo

the adopted formula is not reported in the catalogue entries

LAA96

no magnitude determination

MEM83

no magnitude determination

KSH82

Used the following relationships for constructing nomograms (see Shebalin, 1974)
by means of which all macroseismic magnitudes were determined:

       Ii = bM - n log ( D2 + h2)1/2

       Io = bM - n log h + c

       Io = Ii - n log (1 + D2/h2)1/2

LAB95

1) M = 0.55 Io + 0.95                                     W. Carpathians         Karnik
2) M = 0.55 Io + 0.93 log (h) + 0.14                       W. Carpathians         Karnik
3) M = 0.70 Io - 0.1                                       E. Alps                 Karnik
4) M = 0.67 Io + 2.67 log (h) - 2.57                       E. Alps                 Drimmel
5) M = 0.60 Io + 1.80 log (h) - 1.0                         Pannonian Basin      Zsiros

the adopted relation is mentioned at each entry with the parameter Cm

GRA78

makes use of the I, M, h relation from the sub-region of SHA74

similar to KSH82

 PAJ72 Earthquakes with depth determination

       M = 0.5 Io + log h + 0.35

Earthquakes without depth determination

       M = 0.63 Io + 0.5