66 



72. March 29. 



A well-defined seismogram obtained at Cordova indicates an origin about 12 distant from that place. 

 The probability is that the same lies to the W. of Cordova off the West Coast of South America, or 

 75 W. Long, and 30 S. Lat. The approximate time at the origin would be about 9 minutes earlier than 

 the time of arrival of M at Cordova, or 16.23. The area over which it was recorded may be represented 

 by a radius of 100. In New Zealand and at the Cape of Good Hope, which lie within this distance, 

 however, it does not appear to have been noted. 



As already noted for Earthquake No. 50, the values for PI increase with the length of the arc, while 

 the values for P 2 and P 3 are fairly constant. 



