740 H. F. REID ADDITIONAL NOTE ON GEOMETRY OF FAULTS 



On examining this table it will be seen that the error made by fol- 

 lowing the approximate method will be small for any rotations likely 

 to occur. In general, results sufficiently accurate will be obtained by 

 determining the dip of the resultant axis and the amount of the result- 

 ant rotation around it by the approximate method ; but the azimuth of 

 the resultant axis will make an angle s^a/^ with the direction of the 

 horizontal component axis. The positive direction of the resultant axis 

 will dip dow^nward if the positive direction of the vertical component 

 axis is downward and vice versa. 



