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Show 44 a t t h e b a s a l t - s e d i m e n t c o n t a c t , as t h e " p u r e " w a t e r i n t he b a s a l t g r a d e s i n t o t h e " c o n t a m i n a t e d " w a t e r i n t h e s e d i m e n t. S c h l u m b e r g e r D a ta D a t a f r om t h e S c h l u m b e r g e r c r o s s e d - s o u n d i n g s on t he s e d i m e n t s o u t h of F u m a r o l e B u t t e a r e shown i n F i g u r e s 4 a n d 5. The c l o s e c o m p a r i s o n b e t w e e n t h e d a t a f r om t he t w o s o u n d i n g s - one of w h i c h was p a r a l l e l t o , and t h e o t h er p e r p e n d i c u l a r t o , t h e p r e s u m e d s t r u c t u r a l t r e n d of t he a r e a - i n d i c a t e s a l a t e r a l l y u n i f o r m , h o r i z o n t a l l y - l a y e r ed s u b s u r f a c e . Minor l a t e r a l i n h o m o g e n e i t i e s , e l e c t r i c al a n i s o t r o p y of t h e s e d i m e n t s , and an e s t i m a t e d 5 p e r c e nt a c c u r a c y of t h e f i e l d d a t a , a c c o u n t f o r t h e s m a l l v a r i a t i o n s b e t w e e n t h e c u r v e s. The s o u n d i n g c u r v e s a r e b e l i e v e d t o r e p r e s e n t a t y p i c a l d e s e r t e n v i r o n m e n t c o n s i s t i n g of a d r y , r e s i s t i ve s u r f a c e l a y e r , a s a l i n e - r i c h l a y e r i m m e d i a t e l y a b o v e t he w a t e r t a b l e ( s a l t c o n c e n t r a t e d by r a i n - w a t e r l e a c h i n g of o v e r l y i n g s e d i m e n t and by w a t e r t a b l e e v a p o r a t i o n ) , and a r e s i s t i v e s u b s t r a t u m c o n t a i n i n g r e l a t i v e l y f r e s h w a t e r . A 4 - l a y e r e d m o d e l p r o v i d e d t h e b e s t c u r v e f i t of t h e d a t a, b a s e d on an i n f l e c t i o n i n b o t h c u r v e s a t a b o u t AB/2 - 5 m e t e r s . T h e r e f o r e , t h e h o r i z o n a b o v e t h e s a l t l a y e r may b e i n t e r p r e t e d as c o n t a i n i n g a t h i n , d r y , r e s i s t i v e s u r f a ce l a y e r o v e r l y i n g a d a m p , l e s s r e s i s t i v e w e a t h e r e d l a y e r. 45 FIGURE 4 S c h l u m b e r g e r s e d i m e n t s o u n d i n g (N-S) A B / 2 M E T E RS FIGURE 5 S c h l u m b e r g e r s e d i m e n t s o u n d i n g (E-W) 10* 7 5 3 2 1 i i 1 i 1 " 1 I 1 i l l ! I 1 " i 1 • DATA VALUES _ - - INVERSE INTERPRETATION - _p=7.63 Q-m a ±0.50 p»10.0n-m ±0.2 ~~t|3.65m ** - ±0.65 - 10 7 5 3 2 1 0 ' 7 5 3 2 J L 10 o p3= l .87 Q-m ±0.83 t«37 .28m ±3.80 p»27.0 fi-m ± 5.0 tj0.46m ±0.07 E -W J L J L J L 5 7 JO 5 7 |0 J I I 5 7 IC A B / 2 M E T E RS 47 The r e s u l t s a r e i n good a g r e e m e n t w i t h a p r o j e c t e d d e p th t o t h e w a t e r t a b l e of a b o u t 10 m e t e r s . The c u r v e s a s y m p t o t e a t a b o u t 1 0 - 1 2 o h m - m e t e r s as AB/2 b e c o m e s l a r g e , and r e s i s t i v i t i e s of t h i s m a g n i t u de s h o u l d be e x p e c t e d b e n e a t h t h e b a s a l t . However, an e v a p - o r i t e l a y e r may n o t be p r e s e n t b e c a u s e of t h e i n s u l a t i ng e f f e c t of t h e b a s a l t. The S c h l u m b e r g e r c r o s s e d - s o u n d i n g s on F u m a r o l e B u t te p r o d u c e d r e a s o n a b l y u n i f o r m d a t a ( F i g u r e s 6 t h r o u g h 10) c o n s i d e r i n g t h e l a t e r a l and v e r t i c a l i n h o m o g e n e i t y p o t e n t i a l of a m u l t i f l o w a g g r e g a t e of b a s a l t , e s p e c i a l l y one c o v e r e d w i t h i n l i e r s of s i l t and c l a y . However, l a t e r al e f f e c t s from i n h o m o g e n e i t i e s (Van N o s t r a n d and C o o k , 1966) a r e a p p a r e n t on t h e s o u n d i n g c u r v e s and t h e d a t a c o u l d n ot b e m o d e l e d as a c c u r a t e l y as t h e S c h l u m b e r g e r s e d i m e nt s o u n d i n g s . I n v e r s e m o d e l i n g (Inman, 1973) was u s e d to o b t a i n t h e b e s t l e a s t s q u a r e s c u r v e f i t s t o t h e d a t a. F u m a r o l e B u t t e N o r t h e a s t One (FBNE 1 ) was l o c a t ed n o r t h e a s t of t h e v o l c a n i c n e c k i n t h e v i c i n i t y of s e v e r al l a r g e i n l i e r s of Lake B o n n e v i l l e s e d i m e n t s ( P l a t e 1 ) . The t h i c k n e s s of t h e s e d i m e n t c o v e r was d e t e r m i n e d t o be a b o ut 4 m e t e r s t h i c k , and t h e u n d e r l y i n g b a s a l t a b o u t 120 m e t e rs t h i c k ( F i g u r e 6 ) . F u m a r o l e B u t t e S o u t h w e s t One (FBSW 1) was l o c a t e d s o u t h w e s t of t h e v o l c a n i c n e c k i n an a r e a of 4 8 FIGURE 6 S c h l u m b e r g e r c r o s s e d - s o u n d i n g FBNE 1 ( e a s t - w e s t a n d n o r t h - s o u t h ) on F u m a r o l e B u t te 700 - 500 400 300 200 £ 150 I £ 50 - 40 h- ^ 30 CO LU * 20 H 15 UJ § 10 Q_ CL < 7 5 4 T 1 1-i-~i r T i r-~T r--r i 1-"i-r \ F B N E 1 ( E - W & N - S ) o = FIELD DATA VALUES (N-S SOUNDING) A-^"= CURVE MATCH FROM COMPUTED MODEL FIELD DATA CURVE (E-W SOUNDING) /} \ \ \ \ \ \ \ 500 1000 2000 3000 4000 AB/2 CONTINUED _ fx = 113.31 Am, hi = 0.60 £3 = 460 Am h3 = 115.5 m 6 4 = 25 nm h4= 00 I I 1 1 1 1 1 I I I I 1 1 1 i AB T 1.5 2 3 4 5 T |0 15 20 30 40 50 70 AB/2 METERS 150 200 300 500 49 FIGURE 7 S c h l u m b e r g e r c r o s s e d - s o u n d i n g FBSW 1 ( e a s t - w e s t) on F u m a r o l e B u t te i-~i-i 1 r 1 1 r F B S W 1 ( E - W ) i 1--r 200 , E• 150 i IA A 70 >-" 50 > 40 00 30 00 UJ en 20 \- 15 UJ AR 10 Q_ <OL 7 i-~i-i r O o y y y •V y y / e = FIELD DATA VALUES = CURVE MATCH FROM COMPUTED MODEL -/•£*! = 2. 96 Am, hi = 1.25 m i $2 - 2133 Am h-» = 71.5 m h3 ?2 = 1527 Am h2 = 96 . 0 m 6*3 0 h 3 = «• ^ • ^ 1 = 3. 16 Am, hi - 1.33 m l i I I l I I i l 1 l 1 l 1 I I t i l l AB T 1.5 2 3 4 5 7 10 15 20 30 40 50 70 AB/2 METERS 150 200 300 500 50 FIGURE 8 S c h l u m b e r g e r c r o s s e d - s o u n d i n g FBSW 1 ( n o r t h - s o u t h) on F u m a r o l e B u t te i ! 1-i 1 r 1 1 1 T i-I r 700 - - y F B S W 1 ( N - S ) / / e = FIELD DATA VALUES ..- = CURVE MATCH FROM COMPUTED MODEL r = 2.67yim, h± = 1.31 m / 6.2 = 1917 A in h2 = 8 4.5 m P3 = 28.2am, h3 - oo i i i i i i i i i i i i i i i i i i i i 1.5 2 3 4 5 7 |0 15 20 30 40 50 70 AB/2 METERS 100 150 200 300 500 |Q( FIGURE 9 S c h l u m b e r g e r s o u n d i n g FBSW 2 a ( e a s t - w e s t ) on F u m a r o l e B u t te T-~i ~r-i-r--r 1--r-r i i F B S W 2 o ( E - W) A A FIELD DATA VALUES = CURVE MATCH FROM COMPUTED MODEL i ^2: = 372Am, h2=5. 4 3m ei=H2.3nm, hi = 8.25ra <?3=4 9 3 4Am hi^G1.2m 64 = 99.2Ara, h4 AB T J-I L 15 2 3 4 5 ? J I L 10 15 20 30 40 50 70 AB/2 METERS 150 200 300 500 FIGURE 10 S c h l u m b e r g e r s o u n d i n g FBSW 2 b ( n o r t h - s o u t h ) on F u m a r o l e B u t te 700 500 400 300 200 £ 150 I CJ w 100 70 »>--" - 50 > 00 UJ i 1-i r T--~T~-f I I I UJ a: < CL < 20 15 10 7*- 5 4 p p. <t VI $1=7.4/im hi=2.62m © = FIELD DATA VALUES ..-"^ = CURVE MATCH FROM COMPUTED MODEL £ 2 ~ 2212 Am h2 - 136 m e - o AB T J L 1.5 2 J I L 15 20 30 40 50 AB/2 METERS 70 150 200 300 500 1000 53 b a s a l t and s u p e r f i c i a l s e d i m e n t c o v e r ( P l a t e 1 ) . The i n t e r p r e t a t i o n s of t h e e a s t - w e s t and n o r t h - s o u t h c o n c e n t r i c s o u n d i n g s a r e shown i n F i g u r e s 7 and 8 r e s p e c t i v e l y . The c r o s s e d - s o u n d i n g s e a c h g i v e s i m i l a r r e s u l t s , i n d i c a t i ng a b o u t 1.3 m e t e r s of c o n d u c t i v e o v e r b u r d e n c o v e r i n g 71 t o 96 m e t e r s of b a s a l t . Two m o d e l s a r e g i v e n f o r FBSW 1 (E-W) b e c a u s e t h e y f i t t h e d a t a e q u a l l y w e l l. Two m o r e s o u n d i n g s w e r e c o n d u c t e d on t h e b a s a l t i n t he v i c i n i t y of t h e FBSW 1 s o u n d i n g s . One s o u n d i n g (FBSW 2a (E-W)) was c e n t e r e d 300 m e t e r s s o u t h of t h e FBSW 1 s o u n d i ng c e n t e r and was e x p a n d e d p a r a l l e l t o FBSW 1 ( E - W ) ; t h e o t h er (FBSW 2 b ( N - S ) ) was c e n t e r e d 300 m e t e r s e a s t of t h e FBSW 1 s o u n d i n g c e n t e r and was e x p a n d e d p a r a l l e l t o FBSW 1 (N-S) ( P l a t e 1 ) . The f i e l d d a t a and i n v e r s e i n t e r p r e t a t i o n s a re shown i n F i g u r e s 9 and 10 r e s p e c t i v e l y . The FBSW 2 b (N-S) s o u n d i n g i s f a i r l y c o n s i s t e n t w i t h t h e FBSW 1 (E-W a n d N-S) s o u n d i n g s , b u t i n d i c a t e s a c o n d u c t i v e o v e r b u r d e n t h i c k n e ss ( 2 . 6 m e t e r s ) and a b a s a l t t h i c k n e s s (136 m e t e r s ) g r e a t er t h a n t h e FBSW 1 s o u n d i n g s . The FBSW 2 a (E-W) s o u n d i n g, h o w e v e r , i n d i c a t e s e n t i r e l y d i f f e r e n t r e s u l t s , a l t h o u g h it was c e n t e r e d o n l y a few h u n d r e d m e t e r s f r om t h e o t h er s o u n d i n g s . A 4 - l a y e r e d m o d e l , c o n s i s t i n g of a b o u t 14 m e t e r s of o v e r b u r d e n c o v e r i n g 61 m e t e r s of b a s a l t , p r o v i d ed t h e b e s t i n v e r s e i n t e r p r e t a t i o n of t h e d a t a . F u r t h e r m o r e, 54 t h e l a y e r r e s i s t i v i t i e s of t h e FBSW 2 a (E-W) s o u n d i ng mode 1 a r e much g r e a t e r t h a n t h e l a y e r r e s i s t i v i t i e s of t h e o t h e r s o u n d i n g s i n t h e F u m a r o l e B u t t e S o u t h w e s t a r e a. W h e r e a s t h e o t h e r s o u n d i n g s i n d i c a t e d o v e r b u r d e n r e s i s t i v i t i e s of 1-2 o h m - m e t e r s and b a s a l t r e s i s t i v i t i e s of a r o u n d 2 , 0 0 0 o h m - m e t e r s , FBSW 2 a (E-W) i n d i c a t e d an o v e r b u r d e n r e s i s t i v i t y in e x c e s s of 100 o h m - m e t e r s and a b a s a l t r e s i s t i v i t y of a b o u t 5 , 0 0 0 o h m - m e t e r s . The r e s i s t i v i t y of t h e s e m i - i n f i n i t e h a l f - s p a c e u n d e r l y i n g t he b a s a l t was i n t e r p r e t e d t o be a b o u t 100 o h m - m e t e r s from t he FBSW 2 a (E-W) d a t a , w h e r e a s i t was 25 o h m - m e t e r s o r l e ss f o r t h e o t h e r s o u n d i n g s. T h e s e v a r i a t i o n s b e t w e e n s o u n d i n g m o d e l s may be a t t r i b u t e d t o m a c r o a n i s o t r o p y of t h e s e d i m e n t s and b a s a l t , t o l a t e r a l i n h o m o g e n e i t i e s , and t o v a r y i n g t h i c k n e s s of c o n d u c t i v e o v e r b u r d e n . The s e d i m e n t o v e r b u r d e n " t r a p s" t h e c u r r e n t b e c a u s e i t i s more c o n d u c t i v e t h a n t h e u n d e r l y i n g b a s a l t . The c u r r e n t e l e c t r o d e s must be e x p a n d ed much f u r t h e r f o r t h e c u r r e n t t o p e n e t r a t e t h e c o n d u c t i ve o v e r b u r d e n t h a n l i n e a r r e s i s t i v i t y t h e o r y w o u l d i n d i c a te ( a s s u m i n g a c o n s t a n t r a t i o b e t w e e n e l e c t r o d e s e p a r a t i on a n d t h e e f f e c t i v e d e p t h of i n v e s t i g a t i o n f o r a g i v e n e l e c t r o d e c o n f i g u r a t i o n (Roy and A p p a r a o , 19 7 1 ; F r o h l i c h , 19 7 4 ) ) . T h i s r e s u l t s in o v e r b u r d e n t h i c k n e s s b e i n g o v e r e s t i m a t e d. 55 A l s o , t h e r e i s an i n v e r s e r e l a t i o n b e t w e e n r e s i s t i v i t y and b e d t h i c k n e s s t h a t can r e s u l t i n a r a n g e of s o l u t i o n s for a g i v e n s e t of f i e l d d a t a . The r a n g e of s o l u t i o n s w i ll d e p e n d l a r g e l y on t h e a c c u r a c y of t h e d a t a. The d i p o l e - d i p o l e r e s i s t i v i t y p r o f i l e s s u g g e s t t h at t h e b a s a l t i s t h i c k e r b e n e a t h t h e s o u t h w e s t s o u n d i n g s t h an t h o s e n o r t h e a s t of F u m a r o l e B u t t e . In p a r t , t h i s can be e x p l a i n e d by a 40 m e t e r e l e v a t i o n d i f f e r e n c e b e t w e e n t he t w o s o u n d i n g a r e a s ( A s s u m i n g a r e l a t i v e l y f l a t b a s . a l t - s e di m e n t c o n t a c t , t h e b a s a l t w o u l d b e a b o u t 40 m e t e r s t h i n n er i n t h e n o r t h e a s t a r e a ) . T h e r e i s a l s o a d e f i n i t e d e c r e a se i n t h e a p p a r e n t r e s i s t i v i t y of t h e b a s a l t u n d e r t h e n o r t h e a s t s o u n d i n g as d e t e r m i n e d by m o d e l i n g t h e S c h l u m b e r g er s o u n d i n g d a t a . This may b e a t t r i b u t a b l e t o an i n c r e a s e in w a t e r or c l a y c o n t e n t , t o r e c i p r o c i t y b e t w e e n r e s i s t i v i ty a n d b e d t h i c k n e s s , a n d / o r t o a l e s s e r r e s o l u t i o n of i n t e r m e d i a t e b e d s as i n t h e c a s e of a r e s i s t i v e bed b e t w e e n two c o n d u c t i v e l a y e r s . Zohdy (1968) r e p o r t s t h a t t h e s h a p e of a 5 - l a y e r r e s i s t i v i t y c u r v e r e m a i n e d u n c h a n g e d when t he m i d d l e l a y e r r e s i s t i v i t y d e c r e a s e d by a f a c t o r of 1 3 8 0, when t h e a d j a c e n t l a y e r r e s i s t i v i t i e s w e r e i n c r e a s e d by f a c t o r s of l e s s t h a n two t o c o m p e n s a t e t h e l a r g e r e s i s t i v i t y d e c r e a s e . I n h o m o g e n e i t i e s s u c h as c o n d u c t i v e c l ay i n l i e r s , p o s s i b l e f a u l t s , and l a v a f l o w c o n t a c t s may a l so 56 a c c o u n t f o r t h e s u b s t a n t i a l d i f f e r e n c e b e t w e e n t h e S c h l u m b e r g e r m o d e l s of t h e b a s a l t. T h e F u m a r o l e B u t t e s o u t h w e s t s o u n d i n g s , h o w e v e r , are c o n s i s t e n t e n o u g h t o w a r r a n t t h a t an o v e r a l l model f o r t he b a s a l t be p r o p o s e d as f o l l o w s: The t h i c k n e s s of t h e b a s a l t in t h e v i c i n i t y of t he s o u t h w e s t s o u n d i n g s i s 75 t o 90 m e t e r s . The r e s i s t i v i ty o f t h e b a s a l t i s a r o u n d 2000 o h m - m e t e r s ( a l t h o u g h r e s i s t i v i t i e s as h i g h as 5000 o h m - m e t e r s a r e s u g g e s t e d by one s o u n d i n g ) . Assuming a r e l a t i v e l y h o r i z o n t a l b a s a l c o n t a c t, t h e b a s a l t can be e x p e c t e d t o b e a r o u n d 45 m e t e r s t h i c k in t h e v i c i n i t y of t h e n o r t h e a s t s o u n d i n g s (due t o e l e v a t i on c h a n g e ) . The l o w e r r e s i s t i v i t y of t h e b a s a l t i n t h e n o r t h e a s t a r e a may be a t t r i b u t e d t o m a s k i n g e f f e c t s of c o n d u c t i v e o v e r b u r d e n , a d d i t i o n a l w a t e r c o n t e n t , and ( p o s s i b l y) a d d i t i o n a l c l a y c o n t e n t of t h e b a s a l t. V CONCLUSIONS The d i p o l e - d i p o l e r e s i s t i v i t y - I P d a t a f r om L i n e 1 a n d L i n e 2 on F u m a r o l e B u t t e i n d i c a t e a r e l a t i v e l y h o r i z o n t a l l y l a y e r e d s u b s u r f a c e . R e s i s t i v i t y d e c r e a s e s and i n d u c e d p o l a r i z a t i o n i n c r e a s e s w i t h d e p t h . These e f f e c ts a r e a t t r i b u t e d t o an i n c r e a s e i n g r o u n d w a t e r , and s a lt a n d c l a y , as t h e e f f e c t i v e p e n e t r a t i o n of t h e e x p a n d i ng r e s i s t i v i t y a r r a y a p p r o a c h e s a t h i c k s e d i m e n t a r y s e q u e n ce b e n e a t h F u m a r o l e B u t t e . The b a s a l t - s e d i m e n t c o n t a c t is r e l a t i v e l y h o r i z o n t a l and t h e v a r i a t i o n s of t h i c k n e s s of t h e b a s a l t , i n d i c a t e d by t h e d i p o l e - d i p o l e p s u e d o - s e c t i o n s, a r e b e l i e v e d t o be c a u s e d by e l e v a t i o n c h a n g e s a l o n g t he d i p o l e - d i p o l e l i n e s. S c h l u m b e r g e r s o u n d i n g s on F u m a r o l e B u t t e s u b s t a n t i a te t h e d i p o l e - d i p o l e d a t a a n d i n d i c a t e a b a s a l t t h i c k n e s s of 75 t o 9 0 m e t e r s i n t h e v i c i n i t y of t h e F u m a r o l e B u t te S o u t h w e s t s o u n d i n g s . The b a s a l t t h i c k n e s s i n t h e v i c i n i ty o f t h e n o r t h e a s t s o u n d i n g s i s a b o u t 4 5 m e t e r s due t o t he d i f f e r e n c e i n e l e v a t i o n b e t w e e n t h e two a r e a s . The r e s i s t i v i t i e s of t h e b a s a l t and s e d i m e n t a r e e s t i m a t e d t o be a b o u t 2 , 0 0 0 o h m - m e t e r s a n d 1 0 - 1 2 o h m - m e t e r s r e s p e c t i v e l y, f r om S c h l u m b e r g e r s o u n d i n g s on t h e b a s a l t and s e d i m e n t. 58 D e p t h s of i n v e s t i g a t i o n may be e s t i m a t e d a t a b o ut 1 2 5 m e t e r s f o r t h e F u m a r o l e B u t t e S o u t h w e s t s o u n d i n g s and u p t o 75 0 m e t e r s f o r t h e F u m a r o l e B u t t e N o r t h e a s t s o u n d i n g s . P e n e t r a t i o n f o r t h e d i p o l e - d i p o l e p r o f i l e s i s e s t i m a t e d a t a b o u t 360 m e t e r s f o r t h e maximum d i p o l e s p a c i n g. W i t h i n t h e s e i n v e s t i g a t i v e c a p a b i l i t i e s , F u m a r o l e B u t te a p p e a r s t o be an i s o l a t e d b a s a l t f l o w o v e r l y i n g s e v e r al h u n d r e d m e t e r s o r more of l a c u s t r i n e a n d f l u v i a l s e d i m e n t s. A few a n o m a l o u s l y h i g h and l o w r e s i s t i v i t y v a l u e s , r e c o r d ed a l o n g t h e d i p o l e - d i p o l e l i n e s in t h e v i c i n i t y of t h e v o l c a n i c n e c k , may i n d i c a t e a l o c a l i z e d f r a c t u r e zone t h r o u gh w h i c h t h e b a s a l t was e x t r u d e d a n d , p o s s i b l y , t h r o u g h w h i ch h o t w a t e r i s now r i s i n g , b u t n o t h i n g c o n c l u s i v e can be s t a t e d f o r t h e s e few v a l u e s. F u m a r o l e B u t t e p r o b a b l y d o e s n o t c o n t r i b u t e t h e r m a l ly t o A b r a h am Hot S p r i n g s . However, t h e b a s a l t f l o w may c o n c e a l a f r a c t u r e zone t h r o u g h w h i c h t h e r m a l v a p o r s o r h ot w a t e r i s r i s i n g . A d d i t i o n a l g e o s c i e n t i f i c i n v e s t i g a t i o ns a r e n e e d e d t o f u r t h e r e v a l u a t e t h e g e o t h e r m a l p o t e n t i al o f t h e F u m a r o l e B u t t e a r e a. REFERENCES CITED A n d e r s o n , D a v i d N . , and L . H . A x t e l l , 1 9 7 2 a , c o m p i l e r s, G e o t h e r m a l o v e r v i e w s of t h e w e s t e r n U n i t e d S t a t e s: G e o t h e r m a l R e s o u r c e s C o u n c i l , El C e n t r o C o n f e r e n c e, F e b r u a r y 1 6 , 17 a n d 1 8 , 1 9 7 2. 1 9 7 2 b , G e o t h e r m a l r e s o u r c e s i n C a l i f o r n i a , in A n d e r s o n , D a v i d N . , and L . H . 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C r i t t e n d e n , Max D . , J r . , 1 9 5 1 , M a n g a n e s e d e p o s i t s of w e s t e r n U t a h : U . S . G . S . B u l l e t i n 979-A. D e y , A b h i j i t , and H. F r a n k M o r r i s o n , 197 3 , E l e c t r o m a g n e t ic c o u p l i n g i n f r e q u e n c y and t i m e - d o m a i n i n d u c e d - p o l a r i z a t i o n s u r v e y s o v e r a m u l t i l a y e r e d e a r t h : G e o p h y s i c s, v o l . 3 8 , N o . 2 , p . 3 8 0 - 4 0 5. D o b r i n , M i l t o n B . , 1 9 6 0 , I n t r o d u c t i o n t o g e o p h y s i c a l p r o s p e c t i n g : M c G r a w - H i l l Book Company, New Y o r k , 4 4 6 p. E r i c k s o n , M . P . , 1 9 6 3 , V o l c a n i c g e o l o g y of w e s t e r n J u ab C o u n t y , U t a h , i n S h a r p , B . J . , and N . C . 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