Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 54 W. D. KELLER Missouri. Two other applications of the earth resistivity method, traversing, and the location of a fault plane, were tested. TRAVERSING Stations were located along a straight line at known intervals and the resistivity of the rocks was measured at uniform depths. These resistivities were plotted against the station locations, giving a re- sistivity profile along the traverse. A change in the character of the â -⢠-H _| _ â -' fir fir a / t 1
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 54 W. D. KELLER Missouri. Two other applications of the earth resistivity method, traversing, and the location of a fault plane, were tested. TRAVERSING Stations were located along a straight line at known intervals and the resistivity of the rocks was measured at uniform depths. These resistivities were plotted against the station locations, giving a re- sistivity profile along the traverse. A change in the character of the â -⢠-H _| _ â -' fir fir a / t 1 ,- â i \ â t- Iâ -f / - â â- H-- / / \ -r â - â / \ 4 ~ / \ ~ - 4- â -- - +- â -- - - / V ;â 4- â 4 ' I i 1 _^ - ~i~ â - - - -j- - J« ⢠/ \ 'â i -\- 1 V i ' \ â i -j- 4- t V \ - 4 . i . r â -L- -- -;- - - - am i 1 J i \ _L â i _L - â - - \ \ r h r \ ' 1 ^ \ \ 1 - / \'\ V- H âºA \ 4- 4- 4 f -' 1*J L\ \\ i / :â¢; \ i 1 ⢠\\ / 1\ . s M i, \ ! -\y '- i / t 1 â 4-1 \ ! / \ ; I . / â r vi ii t i I â J ^ A i i ;// 4- -. \ i / y >< / y ! 1 ;-\ - \\ \ I r / -- - / â jj \ V ft / in ~ ^n - - â ~ - \ // - - - â⢠0 - -⢠- - 1 :- -â - - <«lflyuoArta C*£a**j Oro**yCr CAotfUu B»*''»ft»fl rocks was expected to show an irregularity in the resistivity profile. That such was the case is shown in the curves and cross section on Graph No. 14. Complete depth determinations were made at each station and the resistivities were plotted for 5 depths, 20, 40, 60, 80, and 100 feet. LOCATION OF FAULT By running traverses across a fault at three selected places a small variety of contacts were studied electrically. In one place the St. Peter sandstone was faulted against the Plattin limestone; in another, St. Peter sandstone was faulted against Maquoketa shale; and in the 576
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