Low frequency electromagnetic prospecting system. [Grass Valley, KGRA]

Jain, B.K.

doi:10.2172/6771904

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…I n 1976, Lawrence Berkeley Laboratory, i n conjunction w i t h t h e U n i v e r s i t y of C a l i f o r n i a Berkeley, made p r e l i m i n a r y measurements w i t h a prototype large-moment, h o r i z o n t a l -l o o p EM p r o s p e c t i n g system (Jain, 1978) i n a geothermal a r e a i n Nevada. Encouraging r e s u l t s from t h i s work l e d t o t h e development of the EM-60 h o r i z o n t a l -l o o p system (Morrison e t a l .…”

Section: Em-60 Electromagnetic Systemmentioning

confidence: 99%

Controlled-source electromagnetic survey at Soda Lakes geothermal area, Nevada

Stark¹,

Wilt²,

Haught³

et al. 1980

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The EM-60 system, a large-moment frequency-domain electromagnetic loop p r o s p e c t i n g system, w a s o p e r a t e d i n t h e Soda Lakes geothermal a r e a , Nevada.T h i r t e e n s t a t i o n s w e r e occupied a t d i s t a n c e s ranging from 0.5-3.0 k m f r o m t w o t r a n s m i t t e r sites. These y i e l d e d f o u r sounding curves--the normalized amplitudes and phases of t h e v e r t i c a l and radial magnetic f i e l d s a s a f u n c t i o n of frequency--at each s t a t i o n . In a d d i t i o n , t w o p o l a r i z a t i o n e l l i p s e parameters, e l l i p t i c i t y and tilt angle, w e r e c a l c u l a t e d a t each frequency.The data w e r e i n t e r p r e t e d by means of a l e a s t -s q u a r e s i n v e r s i o n procedure which f i t s a l a y e r e d r e s i s t i v i t y model t o t h e data. A t h r e e -l a y e r s t r u c t u r e i s i n d i c a t e d , with a near-surface 10 ohm-m l a y e r of 100-400 m t h i c k n e s s , a middle 2 ohm-m l a y e r of approximately 1 km t h i c k n e s s , and a "basement" of

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Section: Em-60 Electromagnetic Systemmentioning

confidence: 99%

Controlled-source electromagnetic survey at Soda Lakes geothermal area, Nevada

Stark¹,

Wilt²,

Haught³

et al. 1980

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“…Because the EM induction method is generally much less sensitive to resistive bodies than to conductors, the depth to and resistivity of this unit made preliminary measurements with a prototype large-moment horizontal-loop EM prospecting system (Jain, 1978) in a geothermal area in Nevada. Encouraging results from this work led to the development of the EM-60 horizontalloop system (Morrison et al, 19781, which has now been operated for over 500 hours at various geothermal sites in Nevada and Oregon.…”

Section: Apparent Resistivity Plotsmentioning

confidence: 99%