ave the effect of separating Resurrection Bay into two deep basins con- 

 ected by a narrow, shallower neck (Figures 133a and 13^). The. bay may 

 e simulated by the geometrical analogy of two rectangular basins I and 

 II (Figure 133b) interconnected by the short, shallower channel II. 



TABLE VI 



Dimensions of Interconnecting Rectangular Basins 

 Simulating Resurrection Bay (see Figure 133b) 



Basin 



Length 



Breadth 



Depth 





L (ft) 



b (ft) 



d (ft) 



I 



i+T,300 



13,500 



875 



II 



10,100 



11,800 



500 



III 



57,500 



15,200 



775 



We investigate the oscillating properties of this chain system of 

 asins by recourse to the impedance principle of Rayleigh Cl9^5 Ed.) as 

 mployed by Neumann (19^8). Adopting dimensions of length L, breadth b, 

 Qd depth d, as found from Figure 13^, in accord with Table VI, the first 

 ifo modes of free oscillation of the system are found to have the periods 



(i) T-L - 26.0 minutes 



(ii) T2 =12.5 minutes 



:>3) 



These equations show that Resurrection Bay was neither long enough 

 Dr shallow enough (as Port Alberni, Canada, for example) to provide any 

 Drm of resonant response to the primary long waves of the tsunami whose 

 sriod was about two hours. However, considering our investigation of 

 ther situations of tsunami penetration into bays and inlets, it seems 

 tiat pseudo-resonance could develop for any third harmonic or fifth 

 armonic of the main tsunami that might exist. 



Most of the available information on waves in Resurrection Bay re- 

 ates to Seward, which was devastated by seismic sea waves both during and 

 fter the earthquake. Eyewitness reports of the debacle that followed the 

 arthquake are supported by postquake measurements of runup along the 

 horelines (for example, see Grantz, et al, I96U; Brown, 196^+; Berg, et 

 1, 196^1; Coast & Geodetic Survey, 196U; Denner, I96U; Plafker and Mayo, 

 965; Spaeth and Berkman, 1965 , 1967; Lemke, 1967). 



The location of Seward is shown in Figure 13^ and in the prequake 

 erial photograph, Figure 135. Upon the latter we have inserted, for 

 ontrast , the high water line reached by the seismic sea waves and the 



k 



209 



