﻿REPORT OF TITE DIRECTOR IQIO 23 



October 20. The record of a distant earthquake, probably origin- 

 ating 5000 miles or more away, but not identified with any known 

 disturbance on land. 



October 31. Tremors showing fairly defined phases, with an 

 indicated source 3000 miles distant. North-south component slightly 

 larger than the other. Possibly a Mexican disturbance. 



November 10. The time of beginning uncertain and perhaps 

 earlier than indicated, as the first motion develops insensibly from 

 the unbroken line. No tracing on the north-south instrument. Epi- 

 center not known. 



December 9. Phases of record undecipherable. The wave mo- 

 tion is preceded by tremulous lines which continue for a long time. 



January I. A fairly strong earthquake, apparently originating 

 about 2000 miles from Albany, perhaps in the Caribbean region. 

 Press dispatches later reported a disturbance in Yucatan on the same 

 day but without information as to the exact time. 



January 22. The heaviest quake of the year indicated on the 

 machines, with a maximum amplitude of 30 mm and continuing for 

 more than an hour. It originated in or near Iceland where severe 

 shakings were reported at 7.45 a. m. local time, which is close agree- 

 ment with the Albany record after allowance for longitude and 

 period of transmission. 



January 23. A wavy line, giving doubtful readings. 



February 28. Very faint at first, with no decided wave motion 

 for a considerable interval. 



March 30. Tracing of a very distant quake. 



May 4. The beginning was probably earlier than indicated. This 

 appears to have been the shock which destroyed Cartago, Costa Rica, 

 the only notable earthquake disaster of the year. The record does 

 not give a true measure of the disturbance, which was extremely 

 damaging and violent. 



May 13. A characteristic tracing with moderate wave motion. 

 Origin from 4000 to 5000 miles distant. 



May 20. This seems to have originated within a relatively short 

 distance, perhaps near Iceland. 



June 16. A shock of moderate size, without any clear indications 

 of its source. Slight tremors were reported in certain parts of 

 Spain at about the same time. The north-south component much 

 smaller than the east-west. The different phases are poorly distin- 

 guished. 



