180 



REID ET AL, — REPORT ON NOMENCLATURE OF FAULTS 



The former use of the word "radial" is older and more general than 

 Scott's and should be adopted. 



ab = slip 

 bk = throw 

 ak = heave 



el or bh = stratig. separ 

 ec — vertical separation 

 bg or eg = horiz. separ. 

 5 = dip of strata 

 D = dip of fault 

 H = hade of fault 



Figure 9. — Section of a reverse dip-slip Fault 

 (Legend for figures 9, 10, 11, and 12) 

 strat. sep. 



vert. sep. 

 throw 



= tan. D = cot. H 



heave 

 throw 



= sin. D = cos. H 



slip 

 heave 

 = cos. D = sin. H 



vert, separ. 



hor. separ. 

 strat. sep. 



tan. 5 



strat. sep. 



hor. sep. 



offset 



= sin. 5 



slip 

 strat. separ. 



slip 



sin (D±5) ; the proper sign 



to take will appear from the triangle a & h. 



Special Terms 



The following terms refer to the displacement on faults and do not 

 refer to the form of the earth's surface. They denote geologic structure, 

 not topographic form. 



