SECULAR MOVEMENTS 



217 



"irregular and uneven for a distance of about two miles, that a 

 (li-tour was made and the cable lengthened by five or six miles." 

 In still another case (1885) the repairing vessel found a "difference 



Fig. 218. Line of the fault where movement took place during the California 

 earthquake of 1906. (U. S. Geol. Surv.) 



of 1,500 feet between the bow and stern soundings." These records, 

 if correct, point to sea-bottom faulting on a large scale. 



SECULAR MOVEMENTS 



The minute and momentary oscillations of earthquakes are very 

 unlike the slow movements of continents or ocean basins, or even 

 the slow wrinkling of mountain folds. Rivers may wear down 

 their channels across a mountain range as fast as it rises across 



