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Impulse radar experiments on permafrost, Tuktoyaktuk, Northwest territories
32A
Core recovery, logging, probing, boring and sampling
772148 CONTINUOUS SEI~q~C REFLECTION PROFILI:~3 OF THE DEEP BASEMENT, HARDEMAN COU~FfY, TE~
15~6
7721~3 GEOLOGIC WELL LOG ANALYsIs Pit son, S Houston: Gulf, 1970, 370P
Presents the first results of this study of the basement rocks of Hardeman County, Texas, discusses those results in the light of known basement geology of the area and in the light of related experiments el~here, and draws attention to the exception~l Potential of this high-resolution method for subsequent st~les of the basement in other areas.
Concerns t h e use of well logs for geological studies such as sedimentation, fluid migration, tectonic deformation etc. Includes a chaffer on fracture intensity logging and mapping in brittle reservoir rocks such as chalk, limestone and dolomite. 772144 PROBING AHEAD FOR TUNNELS Tunn Tunnlng, Vg, NI, 1977, P51-55
772~9 NEW
EVIDENCE FRC~ OFFSET A E R C ~ N E T I C ANOMALIES FOR TRANSCURREhT FAUltING ASSOCIATED WITH THE BATHURST AND MCDONALD FAULTS, NOSTHWESY TERRITORIES Thomas, M D; Gibb, R A; Quince, J R Can J Earth Sci, VI3, I~J, Sept 1976, P124d~1250
The essential features of a major report pre-
pared by a Transport and Road Research Laboratory/Build_ling Research Establishment Working Party are presented. Practical examples of cases in which probing ahead had and had not been of assistance to tunnel engineers are given. Ways in which research into probing ahead is being organised in the United Kingdom are briefly discussed.
Suggests new estimates of relative horizontal displacements alomg these faults bases on offsets of aercmagnetia anomalies. The aeromagnetic patterns also reveal the presence of severs~ previously unrecognized faults of major proportions associated with the Bathurst fault system.
Geophysical techniques 77z145
METHOD OF CROSSHOLE SEISMIC TESTING Ballerd, R F J Geotech Er~mg Div ASCE, V102, N@~12, 1976, F1261-1273 For determining in situ S-wave velocities and elastic moduli the crosshole mn~vey, when cozrlucted properly, le~ds itself best to signal enhancemen% techniques and appears most versatile. Develolx~ent of a nondestructive vertically polarized repeatable shear wave source is presented. Comparison with other methods leads to the conclusion that a vertically polarized shear wave train can be generated and positively identified due to almost total absence of P-wave coml~nent s.
7721~ MONITORING
THE MECHANICAL STATE OF THE ROCKS BY MEANS OF CHANGES OF THE VERTICAL CGMPONENT OF THE MAGNETIC FrOWn Tarasov, B G; Dyrdin, V V; Ivanov, V V SOv Min Sci, VI2, N1, Jan-Feb 1976, P29-33
Considers the theory briefly and describes an e x p e r i m e n t u a i n g a magnetometer baaed on a Hall transducer. Concludes that magnetic field changes in the edge zone of a seam can serve as a basis for development of a magnetometric method of making relative estimates of the state of stress of the rock with the aim of predicting dynamic p h ~ m a and measuring the extent of the characteristic zones, although the equi!m~ent needs some development.
~2~7 INFORM~ION PARAMETERS AND EST~%TES OF THE RELIABILITY OF ~ N I T O R I N G OF THE STATE OF THE ROCKS Yamahchlkov, V S; Blok, A V SOy M_In Sci, VI2, NI, Jan-Feb 1976, Pll4-117 Discusses the comparative assessment of infcrmarion parameters, P arzl. S wave velocities, damping factor, and establishes a relation between the index of information content of the parameter theta and the reliability of monitoring of the state of the rock.
772150 ULTRASONIC WAVE M E ~ N T S ON FROZEN SOILS AT ~ O S T T~FERATLFSES Kurfurst, P J Can J Earth Sci, V13, NIl, Nov 1976, P1571-
1576
/
An ultrasonic pulse technique was used in the laboratory to meaaure compressional amd shear wave velocities on frozen soil samples with various ice contents. Measurements were made on a variety of samples, which differed in type of material, ~eographical location, and ice content, at temperatures ranging from-7to +ide~ C. Some of the results were compared with ~he results obtained from shallow seismic Nrofiles shot in the field at the sampled drill sites at the time of drilling. The valuss of field velocities lie within the range of laboratory measurements, stud therefore prove that the laboratory tests provide a measure of control in the interpretation of seismic records.
772151 IMPULSE RADAR EXPERIMENTS ON PE~4AFROSr. TUE~OYAE~UK, NORTHWEST TERRITORIES Davis, J L; Scott, W J; Mcrey, R M Can J Earth Sci, V13, Nll, Nov 1976, P1584Preliminary conclusions are that ice/sar~ interfaces were detected to ramges greater than 3Ore. In icy sand, ice lenses separated by 3m were resolved. Clay-til~ice interfaces were not detected at ranges greater than about 3m. San~clsy-till interfaces were detected at ranges greater than 5m. Wide angle reflection and refraction sourzLimg yields estimates of reflector depths anl propagation velocities. Radar has proven useful in delineating geologic structure, but bore-hole control is required for identification of the geological composition of the structure. 772152 RESISTIVITY PROBING OF AN EXPO~ENfIAL EARI~ WITH A HCMOGENEOUS OVERBURDEN Stoyer, C H; Wait, J R Geoexploration, VIb, NI, Jan 1977, Pll-18 Derives a method for computing the normalized
Core recovery, logging, probing, boring and sampling
772148 CONTINUOUS SEI~q~C REFLECTION PROFILI:~3 OF THE DEEP BASEMENT, HARDEMAN COU~FfY, TE~
15~6
7721~3 GEOLOGIC WELL LOG ANALYsIs Pit son, S Houston: Gulf, 1970, 370P
Presents the first results of this study of the basement rocks of Hardeman County, Texas, discusses those results in the light of known basement geology of the area and in the light of related experiments el~here, and draws attention to the exception~l Potential of this high-resolution method for subsequent st~les of the basement in other areas.
Concerns t h e use of well logs for geological studies such as sedimentation, fluid migration, tectonic deformation etc. Includes a chaffer on fracture intensity logging and mapping in brittle reservoir rocks such as chalk, limestone and dolomite. 772144 PROBING AHEAD FOR TUNNELS Tunn Tunnlng, Vg, NI, 1977, P51-55
772~9 NEW
EVIDENCE FRC~ OFFSET A E R C ~ N E T I C ANOMALIES FOR TRANSCURREhT FAUltING ASSOCIATED WITH THE BATHURST AND MCDONALD FAULTS, NOSTHWESY TERRITORIES Thomas, M D; Gibb, R A; Quince, J R Can J Earth Sci, VI3, I~J, Sept 1976, P124d~1250
The essential features of a major report pre-
pared by a Transport and Road Research Laboratory/Build_ling Research Establishment Working Party are presented. Practical examples of cases in which probing ahead had and had not been of assistance to tunnel engineers are given. Ways in which research into probing ahead is being organised in the United Kingdom are briefly discussed.
Suggests new estimates of relative horizontal displacements alomg these faults bases on offsets of aercmagnetia anomalies. The aeromagnetic patterns also reveal the presence of severs~ previously unrecognized faults of major proportions associated with the Bathurst fault system.
Geophysical techniques 77z145
METHOD OF CROSSHOLE SEISMIC TESTING Ballerd, R F J Geotech Er~mg Div ASCE, V102, N@~12, 1976, F1261-1273 For determining in situ S-wave velocities and elastic moduli the crosshole mn~vey, when cozrlucted properly, le~ds itself best to signal enhancemen% techniques and appears most versatile. Develolx~ent of a nondestructive vertically polarized repeatable shear wave source is presented. Comparison with other methods leads to the conclusion that a vertically polarized shear wave train can be generated and positively identified due to almost total absence of P-wave coml~nent s.
7721~ MONITORING
THE MECHANICAL STATE OF THE ROCKS BY MEANS OF CHANGES OF THE VERTICAL CGMPONENT OF THE MAGNETIC FrOWn Tarasov, B G; Dyrdin, V V; Ivanov, V V SOv Min Sci, VI2, N1, Jan-Feb 1976, P29-33
Considers the theory briefly and describes an e x p e r i m e n t u a i n g a magnetometer baaed on a Hall transducer. Concludes that magnetic field changes in the edge zone of a seam can serve as a basis for development of a magnetometric method of making relative estimates of the state of stress of the rock with the aim of predicting dynamic p h ~ m a and measuring the extent of the characteristic zones, although the equi!m~ent needs some development.
~2~7 INFORM~ION PARAMETERS AND EST~%TES OF THE RELIABILITY OF ~ N I T O R I N G OF THE STATE OF THE ROCKS Yamahchlkov, V S; Blok, A V SOy M_In Sci, VI2, NI, Jan-Feb 1976, Pll4-117 Discusses the comparative assessment of infcrmarion parameters, P arzl. S wave velocities, damping factor, and establishes a relation between the index of information content of the parameter theta and the reliability of monitoring of the state of the rock.
772150 ULTRASONIC WAVE M E ~ N T S ON FROZEN SOILS AT ~ O S T T~FERATLFSES Kurfurst, P J Can J Earth Sci, V13, NIl, Nov 1976, P1571-
1576
/
An ultrasonic pulse technique was used in the laboratory to meaaure compressional amd shear wave velocities on frozen soil samples with various ice contents. Measurements were made on a variety of samples, which differed in type of material, ~eographical location, and ice content, at temperatures ranging from-7to +ide~ C. Some of the results were compared with ~he results obtained from shallow seismic Nrofiles shot in the field at the sampled drill sites at the time of drilling. The valuss of field velocities lie within the range of laboratory measurements, stud therefore prove that the laboratory tests provide a measure of control in the interpretation of seismic records.
772151 IMPULSE RADAR EXPERIMENTS ON PE~4AFROSr. TUE~OYAE~UK, NORTHWEST TERRITORIES Davis, J L; Scott, W J; Mcrey, R M Can J Earth Sci, V13, Nll, Nov 1976, P1584Preliminary conclusions are that ice/sar~ interfaces were detected to ramges greater than 3Ore. In icy sand, ice lenses separated by 3m were resolved. Clay-til~ice interfaces were not detected at ranges greater than about 3m. San~clsy-till interfaces were detected at ranges greater than 5m. Wide angle reflection and refraction sourzLimg yields estimates of reflector depths anl propagation velocities. Radar has proven useful in delineating geologic structure, but bore-hole control is required for identification of the geological composition of the structure. 772152 RESISTIVITY PROBING OF AN EXPO~ENfIAL EARI~ WITH A HCMOGENEOUS OVERBURDEN Stoyer, C H; Wait, J R Geoexploration, VIb, NI, Jan 1977, Pll-18 Derives a method for computing the normalized