-"So* 



BERING SEA 



% * ^EUTI AN \SU^°^7 



<£*•' G(yZ.F OF ALASKA 



LEGEND 



~ ALEUTIAN TRENCH 



— — AFTERSHOCK AREA 



— RUPTURE ZONE 



i I SUBSIDENCE 



L\WN UPLIFT 



Figure 2. Aftershock area and rupture zone of the 1964 

 great Alaskan earthquake 



trench by transverse structural features. The blocks are nearly mechanically 

 independent of adjacent blocks. The along-trench limits of each block cor- 

 respond to the along-trench limits of aftershock areas of major historical 

 earthquakes. The only block located such that it was of concern to the study 

 area is that associated with the 1964 great Alaskan earthquake. (The majority 

 of the energy of tsunamis generated by faulting of the other blocks would be 

 propagated away from the study area.) Figure 2 shows the rupture zone and the 

 limits of the aftershock area of this earthquake. Since the rupture zone of 

 the 1964 earthquake covered nearly the entire aftershock area of that earth- 

 quake, all rupture zones in the synthetic record of seabed deformations were 

 located coincident with that of the 1964 earthquake. 



Rupture zone shape and 

 distribution of uplift 



15. The 1964 Alaskan earthquake is one of only two (the other was the 



1960 Chilean earthquake) for which detailed measurements of the deformation 



