.■{9S HKKZtJN AND EWINO [CHAP. 1 <1 



Tasmania and tliusr near Adelaitk', Australia, may Ix' related to the mid-oceanic 

 ridge. The great Alpine Fault of New Zealand seems to be the landward 

 exten.sion of the Macquarie seismic ridge. 



170° I60» 150° 140° 130° 120° 110° 100° 90° 80° 70° 60° 50° 



160° 150° 140° 130° 120° 110° 100° 90° 80° 70° 60° 50° 



Fig. 9. Sli]) faults and heat flow in the mid-oceanic ridge of the east Pacific. The east- 

 west trending black bars indicate the slip faults which cross the crest of the mid- 

 oceanic ridge. Tho l)and of high heat flow associated with the crest of the ridge apy)ears 

 to pass through the western Ignited States. (After .>hniard, I960.) High heat flow has 

 been observed along the crest of the mid-oceanic ridge in the Pacific, as well as at a 

 few points in the North Atlantic. The slip faults in the southeast Paciflc, although 

 probable, are largely hypothetical. Insufficient data ha\e been obtained to indicate, 

 whether slip faults have offset the crest of the mid-oceanic ridge in the eciuatorial or 

 South Pacific. 



From Macquarie Island to Easter Island soundings are sparse, but a mid- 

 oceanic ridge can be delineated. The belt of epicenters continues without 

 interruption. The scatter of plotted epicenters is somewhat greater here than 

 elsewhere, because the accuracy of location is about 2'^ to 5°, but it coincides 



