Bulletin 54. Geophysical Methods of Exploration and their ...

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CONTENTS PAGH PART t GEOPHYSICS DEFINED AND *TS AppLICATIONS DESCRIBED ] nt rod_,c_ioil .............................................. 13 Geophysics defiaed ........................................ 14 Application of geophysical methods in solving diverse problems ............................................ 14 Application of geopyhsics to geological research ............... 15 Choice of methods best adapted to each problem ............... 19 Economic considerations .................. _. .............. 2i PaRT II GEOPHSICAL METHODS OF EXPLORATION Magnetic meti_ods ......................................... 25 Magnetic calculations ...................................... 29 Gravitational methods ..................................... 30 Seismic methods .......................................... 36 Electrical methods ......................................... 41 Electro-magnetic methods ................................... 44 Radlo-ac tire measurements ................................. 45 Considerations which determine choice of methods ............. 45 PaRT Ill GEOPllSICAL INVESTIGATIONS 1N NEW JERSEY Higl_lands of New Jezsey ................................. 4"/ Magnetic it_vestigatlons .................................. 47 Gravitational measurements ............................... 49 Eketdea{ measurements .................................. 49 Triassic Lowlands ......................................... 54 Magnetic investiga_ons ................................... 54 Electdcal measurements ..... .,............................ 56 Gravitational measuremer_ts ............................... -57 Coastal Plai_ ............................................. 58 Seismic exploration ...................................... 58 8amega Bay profile ................................... 59 Cape Bay ptofile ...................................... 67 G:avit 7 measureme*xts ................................... 72 Magl_e6c observations .................................... 75 Rocky Hilt extensions .................................... 79 PlMnsbom ............................................. 82 Eiectdcai measuremems .................................. 86 Staee-wide geophysical investigatiof_s ......................... 86 Co_duslons ............................................... 88 Bihliog:a phy ............................................. 89 [0] NEW JERSEY GEOLOGICAL SURVEY
ILLUSTRATIONS PAGE Frontispiece, Outline map of New Jersey showing location of geophysical work done in New Jersey .............................. 12 Plate I ........................................................... 26 Fig. I. The earth as a magnet A. Magnetic field surrounding a bar magnet, B. Magnetic field surrounding the earth and its relation to the geographic coordinates 2. Anomalous distribution of horizontal arzd vertical components of the earth's magnetic field o,:er a magnetically disturbed area 3. Anomalous distribution of declination and inclination values over a magnetically disturbed area Plate II .......................................................... 33, 4, Anomalous distribution of gravitational quantities over a gravitationally disturbed area 5. Effect of a salt dome on the gravitational field as shown by "'A", a gravimeter map, and "B", a torsion balance map 6. The relation of gravimetric Free Air, Bouguer and lsostafic anomalies in crossing the Rocky Mountains Plate llI ......................................................... 39 • 7. Instrumental "layout" for seismic refraction work 8. Diagram of field relationships in making seismic investig_t!ons Plate IV ......................................................... 40 9. Time-distance graph and its _elatlon to the wave paths in seismic refraction work 10. Diagram of Fan Shooting Method for outlining anomalous areas such as a salt dome Plate V ............................................... : .......... 42 11. Diagram of Self Potential or Natural Current Method of making electrical investigations and results obtained 12. Equipotential line pattern for an undisturbed and a disturbed area using point electrodes 13. Equipotentlal line pattern for an undisturbed and a disturbed area using llae electrodes 14. A. Diagram of Wenner configuration for making electrical resistivity measurements B. Resistivity curve showing the effect of ground water and relation between depth of penetration and elc*ctrode spacing 15. Diagram of method of electric well loKging and log obtained Fig. I6. Magnetic dip and compass variation measurements oaa magnetite ore body at the Washington Mine ................... 43 [10] NEW JERSEY GEOLOGICAL SURVEY
Page 1 and 2: BULLETIN 54 Geologic Series Geophys
Page 3 and 4: • BOARD OF CONSERVATION AND DEVEL
Page 5: PREFACE At the request of Meredith
Page 9 and 10: Outline map of New Jersey showing'
Page 11 and 12: 14 GEOPHYSICAL WORK IN NEW JERSEY m
Page 13 and 14: 16 GEOPHYSICAL WORK IN NEW JERSEY k
Page 15 and 16: 18 GEOPHYSICAL WORK IN NEW JERSEY o
Page 19 and 20: 22 GEOFHYSICAL WORI( IN NEW JERSEY
Page 21 and 22: 24 GEOPHYSICAL WORK IN NEW JERSEY a
Page 25 and 26: 28 GEOPHITSICAL WORK IN NEW JERSEY
Page 31 and 32: 34 GEOPHYSICAL WORK IN NEW JEllSEV
Page 33 and 34: 36 6EOPHYSICAI_ WORK 1N NEW JERSEY
Page 35 and 36: 38 GEOPHYSICAL WORK IN NEW JERSEY F
Page 37 and 38: 40 GEOPHYSICAL WORK IN NEW JERSEY ,
Page 39 and 40: 42 GEOPHYSICAL WORK IN NEW JERSEY P
Page 41 and 42: 44 GEOPHYSICAL WORK IN NEW JERSEY T
Page 43 and 44: 46 GEOPHYSICAL WORK IN NEW JERSEY s
Page 45 and 46: 4_ GEOPHYSICAL WORK IN NEW JERSEY r
Page 47 and 48: 50 (IEOPHYSICAL WORI_ IN NEW JERSEY
Page 49 and 50: 52 (_EOPHVSICAL WORK IN NEW JERSEY
Page 53 and 54: 56 GEOPHYSICAL WORK ]N NEW JERSEY I
Page 55 and 56: 58 GEOPHYSICAL WORK IN NEW JERSEY C
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k 60 GEOPHYSICAL WORK IN NEW JERSEY
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T • • 62 GEOPHYSICAL WORK IN NE
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64 0EOPHYSICAL WORK 1N NEW JERSEY -
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NEW JERSEY GEOLOGICAL SURVEY
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68 GEOPHYSICAL WORK IN NE'W JERSEY
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70 GEOPHYSICAL WORI_ IN NEW JERSEY
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7 72 • r_ X GEOPHYSICAL IN\ ES_HG
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GEOPHYS1CA [J INVESTIGATIONS 73 TAB
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\ DIAGRLPI TO ILLVJT_ATE _A_EF/£NT
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76 G'EOPHYS1CAI_ WORK IN NEW JERSEY
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GEOPHYSICAL INVESTIGATIONS 77 bro i
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GEOPHYSICAL INVESTIGATIONS 79 nitud
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Page 85 and 86:
STRUCTURAL ANALYSIS ON GEOLOGIC - S
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84 GEOPHY _.[CAL \_ ORK IN NEW JERS
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86 GEOPHYSICAL WORK IN NEW JERSEY t
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88 GEOPHYSICAL WORK IN NEW JERSEY l
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