1000 (— 





<■ NOV., IS'JZ 



o^>^0'. o-o j«*o. 



Figure 17. Spectra of tsunamis recorded at Santa Monica. 



right place at the right time and that happened to be normal 

 to the wave front (otherwise the slope is even less). The 

 slope calculations would need to be done in real time on the 

 occasions that the warning service issues an alert contain- 

 ing the time and location of the epicenter. 



Since the availability and orbit of a spacecraft must 

 be fortuitous and the state of the art needs considerable 

 improvement, it does not seem likely that spacecraft measure- 

 ments are a likely prime mechanism for warning purposes. 

 However, if the capability of measuring ocean slopes improves 



26-28 



