290 



HOBBS— THE EVOLUTION AND THE 



[April 24, 



of the zone in which the probabiHty of heavy shocks is now most 

 imminent, are the Japan-Kamschatka segment, the Peru-Bolivian 

 segment, and the archipelago region to the southeast of Asia. Inas- 

 much, however, as between 1899 and 1903, 29, 12 and 41 heavy 

 shocks had been registered by seismographs from the vicinity of 



Ai/^usf iZ C6 ^pr// /a. Ob 



fnOmc/Jotco- 

 Jopon 5egmer>r. 



Ocerrfro 

 Apr// /S.'o7 



/'ormosa 

 mor(/i/7. 06, 



Co/t/fr?i?/0 

 Tan. 29 Od. 







Fig. 5. Diagram showing the distances which separated the approximate 

 centers of areas of the series of earthquakes within the circum-Pacific zone 

 in the years 1906-7. 



these three segments respectively,*^ the time may be long before the 

 limit of strain may again be reached in them. The problem is thus 

 far from simple and prediction would be extremely hazardous. 

 It should not be forgotten that prediction of any sort has thus 



" Milne, Geogr. Jour., 1903, map. 



