﻿1903. 

 June 7, Ba. 8.49, I., CT., Mau., C, S., K., Bi., E., Pa., SR, T., St., Ho., 95° E., 30° N. 



„ 10, Ch. 16.49, W., P., I., Ba., CT., Mau., C, S., K., Bi., SF., T., V., Ho., St., East of Philippines. 

 July 27, T. 10.46, V., Bal, S., K., Bi., E., Pa., SF., Az., North-West Atlantic. 



„ 28, Ch. 4.35, T., V., S., K., Bi., E., St., Mid Atkmtic. 

 August 6, Bi. 3.59, S., K, SF., I., Ti., St., Caucasia. 



October 10, C. 17.3, B., To., I., Ti., S., K., Bi., E., SF., St., Coast of Japan? 

 23, I. 2.40, Ti., B., S., K., Bi., E., Pa., SF., Cai., St., 90° E., ^5° N. 

 November 17, Ma. 20.18, Ba., I., S., K., Bi., Ho., Philippines. 



An inspection of the above list shows that 37 large earthquakes, which without exception originated in 

 the northern hemisphere, did not transmit motion sufficiently far south to be recorded by the " Discovery." 

 Inasmuch as many of these were recorded over areas represented by the three northern continents, the 

 fact that they failed to reach the Antarctic regions can hardly be attributed to want of intensity in 

 originated impulses. The more probable explanation for the lacuna in the " Discovery " register is that 

 the unrecorded earthquakes represent initial efforts or blows which were not delivered in a southerly 

 direction. Isoseists which have been drawn for earthquakes originating between New Zealand and the 

 " Discovery " find an explanation for their form by a supposition of this description (see pp. 91 and 92) and 

 observations on certain recent earthquakes give strength to this idea. For example, the Californian 

 earthquake of April 18, 1906, which originated from a fault parallel to the coast of that country, gave 

 pronounced seismograms in countries lying to the east and west of the same. With the Jamaica earth- 

 quake of January 14, 1907, where the originating line or lines of fracture were apparently east and west, 

 the opposite took place. In Toronto a fairly marked record was obtained while a corresponding record in 

 Europe was small. 



