12 3 4 5 6 

 Tsunami magnitude, m 



Figure 2. Wave height versus tsunami magnitude. 



As shown in Figure 2, Soloviev's scale gives a more rapid increase in 

 maximum wave height than Iida's scale for a given change in tsunami mag- 

 nitude. This indicates that an increase in magnitude on Soloviev's scale 

 would represent a greater increase in tsunami energy than an equivalent 

 increase in magnitude on Iida's scale. 



Abe (1979) suggests that the tsunami magnitude can be represented 

 as a function of the average runup height and a constant which is 

 dependent upon the source region and the station where the tsunami is 

 measured. He shows that the magnitude, obtained by this means, can be 

 related to the seismic moment. 



The probability n(m) of a tsunami with magnitude m being gener- 

 ated in any given year in a specified generating area is given by the 

 empirical equation 



n (m) = ae 



■bm 



(4) 



23 



