342 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



h CHILOE \4? 



Figure 4. — Sketch map of Isla Chilo6 and surrounding area where extensive damage 



occurred. 



continued recording tremors every hour or so for the first day. Dr. 

 Cinna Lomnitz and his colleagues at the Instituto de Sismologia inter- 

 preted these as being to the south and situated over a distance of 400 

 to 1,000 km. Over a period of several days the area of the activity 

 spread southward, and strong shocks were felt on the Peninsula de 

 Taitao. It was sufficiently clear, by this time, that Chile was being 

 subjected to an earthquake swarm of major proportions and that the 

 active area comprised a width of some 160 km. and a length of almost 

 1,600 km. 



