Geophysical Activity in 1980

Geophysics ◽  
1981 ◽  
Vol 46 (9) ◽  
pp. 1316-1333 ◽  
Author(s):  
Russell J. Senti
Keyword(s):  
Statistical Data ◽  
Geophysical Methods ◽  
Groundwater Exploration ◽  
Original Form ◽  
Government Agencies ◽  
Free World ◽  
Alternate Form ◽  
Geophysical Techniques ◽  
General Response ◽  
Survey Questionnaires

Statistical data on geophysical activity in 1980 are gathered from two survey questionnaires mailed to more than 500 companies, contractors, government agencies, and institutions throughout the free world. One questionnaire was the original form which was designed primarily for reporting petroleum activities, and the other, an alternate form, was designed to facilitate reporting of nonpetroleum geophysical activities. We have attempted to gather data from all users of geophysical techniques in the areas of petroleum, mining, geothermal, and groundwater exploration and from those who employ geophysical methods in engineering, oceanography, and research. In general, response to the survey was good. However, we feel that there are new users of geophysical methods we are not reaching. If you did not receive our 1980 questionnaires, please let me know so we can include you on our mailing list for 1981. (As always, data submitted by individual organizations are held strictly confidential.)

Geophysical Activity in 1979

Geophysics ◽  
1980 ◽  
Vol 45 (10) ◽  
pp. 1563-1579 ◽  
Author(s):  
M. G. Whitmire
Keyword(s):  
Statistical Data ◽  
Geophysical Methods ◽  
Drill Hole ◽  
Groundwater Exploration ◽  
Research Data ◽  
Government Agencies ◽  
Free World ◽  
Geophysical Surveys ◽  
Geophysical Techniques ◽  
Survey Questionnaires

This report presents statistical data on geophysical activity in 1979. The data were compiled from survey questionnaires that were completed by more than 500 companies, contractors, government agencies, and institutions throughout the free world. We have gathered information from users of geophysical techniques in the areas of petroleum, mining, geothermal, and groundwater exploration; and from those who employ geophysical methods in engineering surveys, oceanography, and research. Data were gathered on airborne, drill hole, land, and marine geophysical surveys. Statistics were compiled on miles of coverage, drill hole footage, time spent in crew months or man months, and acquisition cost.

GEOPHYSICAL ACTIVITY IN 1977

Geophysics ◽  
1978 ◽  
Vol 43 (6) ◽  
pp. 1277-1291 ◽  
Author(s):  
M. G. Whitmire
Keyword(s):  
Statistical Data ◽  
Geophysical Methods ◽  
Primary Source ◽  
Drill Hole ◽  
Groundwater Exploration ◽  
Government Agencies ◽  
Survey Questionnaire ◽  
Geophysical Techniques ◽  
General Response ◽  
Source Of Information

This report provides worldwide statistical data on geophysical activity in 1977. The primary source of information was a survey questionnaire that was mailed to more than 500 companies, contractors, government agencies, and universities. We have attempted to gather data from all users of geophysical methods in the areas of petroleum, minerals, geothermal, and groundwater exploration; and from those who employ geophysical techniques in engineering, oceanography, and research. In general, response to the survey was good. Detailed information was collected on airborne, drill hole, land, and marine surveys. Statistics were compiled on miles of coverage and acquisition cost. Data not supplied on the questionnaires for cost and line miles were estimated on the basis of worldwide averages to minimize distortion of individual statistical items.

Geophysical Activity in 1978

Geophysics ◽  
1979 ◽  
Vol 44 (10) ◽  
pp. 1740-1754 ◽  
Author(s):  
M. G. Whitmire
Keyword(s):  
Acquisition Cost ◽  
Geophysical Methods ◽  
Groundwater Exploration ◽  
Cost Data ◽  
Government Agencies ◽  
Free World ◽  
Research Information ◽  
Geophysical Surveys ◽  
Geophysical Techniques

This report presents statiscal data on worldwide geophysical activity in 1978. These data were compiled from survey questionaires that were completed by more than 500 companies, contractors, government agencies, and institutions located throughout the free world. We have attempted to gather information from users of geophysical techniques in the areas of petroleum, mining, geothermal, and groundwater exploration; and from those who employ geophysical methods in engineering, oceanography, and research. Information was gathered on airborne, drilled hole, land, and marine geophysical surveys. Statistics were compiled on miles of coverage and acquisition cost. Data not supplied on the questionnaires for cost and line‐miles were estimated on the basis of massive statistical averages for the area and technique reported. This process is necessary to avoid distortion of individual statistical items.

GEOPHYSICAL ACTIVITY IN 1976

Geophysics ◽  
1977 ◽  
Vol 42 (5) ◽  
pp. 1070-1084 ◽  
Author(s):  
H. R. Espey
Keyword(s):  
Geophysical Methods ◽  
Groundwater Exploration ◽  
Computer Processing ◽  
Petroleum Exploration ◽  
Government Agencies ◽  
Survey Questionnaire ◽  
Geothermal Exploration ◽  
Geophysical Techniques

This report provides statistics on worldwide use of geophysical methods in 1976. Data were obtained primarily through a survey questionnaire which was mailed out to more than 500 companies, government agencies, and universities that use geophysical techniques for petroleum exploration, oceanography, engineering, mining, geothermal exploration, and groundwater exploration. Response to the survey was excellent, providing detailed information on all types of airborne, land, and marine surveys. Computer processing was utilized in tabulating the statistics to provide detailed information on methods used, line‐miles covered, and average costs. Data not supplied on the questionnaire for costs or line‐mileage were estimated on the basis of worldwide averages to produce a more comprehensive report.

GEOPHYSICAL ACTIVITY IN 1975

Geophysics ◽  
1976 ◽  
Vol 41 (4) ◽  
pp. 780-794 ◽  
Author(s):  
H. R. Espey
Keyword(s):  
Geophysical Methods ◽  
Groundwater Exploration ◽  
Computer Processing ◽  
Petroleum Exploration ◽  
Government Agencies ◽  
Survey Questionnaire ◽  
Geothermal Exploration ◽  
Unit Costs ◽  
Geophysical Surveys ◽  
Geophysical Techniques

This report provides statistics on worldwide use of geophysical methods in 1975. Data were obtained primarily through a survey questionnaire which was mailed out to more than 1500 companies, government agencies, and universities that use geophysical techniques for petroleum exploration, oceanography, engineering, mining, geothermal exploration, and groundwater exploration. Response to the survey was excellent and provided detailed information on more than 2100 geophysical surveys. Data on unit costs, methods used, and line‐miles covered are believed to be more accurate this year as a result of better cooperation from industry in filling out the questionnaires. Computer processing was utilized in tabulating the statistics to provide increased accuracy and detail. Data not supplied on the questionnaire for costs or line mileage were estimated on the basis of worldwide averages to produce a more comprehensive report.

The Penrith Henges: A Survey by the Royal Commission on the Historical Monuments of England

1992 ◽  
Vol 58 (1) ◽  
pp. 249-264 ◽  
Author(s):  
P. Topping
Keyword(s):  
Present State ◽  
Geophysical Methods ◽  
Round Table ◽  
Royal Commission ◽  
Original Form ◽  
Historical Monuments ◽  
Geophysical Techniques ◽  
Geophysical Prospection

Detailed topographical surveys and geophysical examinations of the Penrith ‘henges’ were undertaken in order to assess the present state of the monuments for management purposes. At Mayburgh geophysical prospection was designed to assess the validity of the early reports of the presence of two concentric settings of stones. Some possible parallels in Ireland are noted. The nearby site of King Arthur's Round Table was also sampled by geophysical techniques, but was found to be too disturbed for the recovery of any further information as to its original form. The ‘cremation trench’ discovered in pre-War excavations at this site was relocated. The position of the enigmatic Little Round Table was re-established by both topographical and geophysical methods, and its north entrance firmly located. The classification of Mayburgh and of the Little Round Table is considered. The apparent disunity of these three distinctly different monuments within one complex is emphasised—all are traditionally classified as ‘henge-related’, yet the structure and orientation of each site is markedly different. Contemporary topographical considerations are now difficult to reconstruct.

Application of geophysical methods for the investigation of the large gravitational mass movement of Séchilienne, France

2005 ◽  
Vol 42 (4) ◽  
pp. 1105-1115 ◽  
Author(s):  
O Meric ◽  
S Garambois ◽  
D Jongmans ◽  
M Wathelet ◽  
J L Chatelain ◽  
...  
Keyword(s):  
Rock Mass ◽  
Mass Movement ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Time Lapse ◽  
Gravitational Mass ◽  
Electrical Tomography ◽  
Refraction Tomography ◽  
Geophysical Surveys ◽  
Geophysical Techniques

Several geophysical techniques (electromagnetic profiling, electrical tomography, seismic refraction tomography, and spontaneous potential and seismic noise measurement) were applied in the investigation of the large gravitational mass movement of Séchilienne. France. The aim of this study was to test the ability of these methods to characterize and delineate the rock mass affected by this complex movement in mica schists, whose lateral and vertical limits are still uncertain. A major observation of this study is that all the zones strongly deformed (previously and at present) by the movement are characterized by high electrical resistivity values (>3 kΩ·m), in contrast to the undisturbed mass, which exhibits resistivity values between a few hundred and 1 kΩ·m. As shown by the surface observations and the seismic results, this resistivity increase is due to a high degree of fracturing associated with the creation of air-filled voids inside the mass. Other geophysical techniques were tested along a horizontal transect through the movement, and an outstanding coherency appeared between the geophysical anomalies and the displacement rate curve. These preliminary results illustrate the benefits of combined geophysical techniques for characterizing the rock mass involved in the movement. Results also suggest that monitoring the evolution of the rock mass movement with time-lapse geophysical surveys could be beneficial.Key words: gravitational movement, geophysical methods, Séchilienne.

The use of geophysical prospecting for imaging active faults in the Roer Graben, Belgium

Geophysics ◽  
2001 ◽  
Vol 66 (1) ◽  
pp. 78-89 ◽  
Author(s):  
Donat Demanet ◽  
François Renardy ◽  
Kris Vanneste ◽  
Denis Jongmans ◽  
Thierry Camelbeeck ◽  
...  
Keyword(s):  
High Resolution ◽  
Physical Properties ◽  
Fault Zone ◽  
Geophysical Methods ◽  
Depth Range ◽  
Electrical Tomography ◽  
Reflection Seismic ◽  
Refraction Seismic ◽  
Geophysical Surveys ◽  
Geophysical Techniques

As part of a paleoseismological investigation along the Bree fault scarp (western border of the Roer Graben), various geophysical methods [electrical profiling, electromagnetic (EM) profiling, refraction seismic tests, electrical tomography, ground‐penetrating radar (GPR), and high‐resolution reflection seismic profiles] were used to locate and image an active fault zone in a depth range between a few decimeters to a few tens of meters. These geophysical investigations, in parallel with geomorphological and geological analyses, helped in the decision to locate trench excavations exposing the fault surfaces. The results could then be checked with the observations in four trenches excavated across the scarp. Geophysical methods pointed out anomalies at all sites of the fault position. The contrast of physical properties (electrical resistivity and permittivity, seismic velocity) observed between the two fault blocks is a result of a differences in the lithology of the juxtaposed soil layers and of a change in the water table depth across the fault. Extremely fast techniques like electrical and EM profiling or seismic refraction profiles localized the fault position within an accuracy of a few meters. In a second step, more detailed methods (electrical tomography and GPR) more precisely imaged the fault zone and revealed some structures that were observed in the trenches. Finally, one high‐resolution reflection seismic profile imaged the displacement of the fault at depths as large as 120 m and filled the gap between classical seismic reflection profiles and the shallow geophysical techniques. Like all geophysical surveys, the quality of the data is strongly dependent on the geologic environment and on the contrast of the physical properties between the juxtaposed formations. The combined use of various geophysical techniques is thus recommended for fault mapping, particularly for a preliminary investigation when the geological context is poorly defined.

scholarly journals Empirical Correlation between Geotechnical and Geophysical Parameters in a Landslide Zone (Case Study: Nargeschal Landslide)

2018 ◽  
Vol 22 (3) ◽  
pp. 195-204 ◽  
Author(s):  
Sadegh Rezaei ◽  
Issa Shooshpasha ◽  
Hamed Rezaei
Keyword(s):  
Electrical Resistivity ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Geophysical Methods ◽  
Field Investigation ◽  
Least Square ◽  
Geotechnical Investigations ◽  
Geophysical Techniques ◽  
Landslide Zone

Today, geotechnical and geophysical techniques are used for landslide evaluation. Geotechnical methods provide accurate data, but are time consuming and costly. Geophysical techniques, however, are fast and inexpensive, yet their accuracy is lower than that of the geotechnical methods. Therefore, simultaneous use of geotechnical and geophysical methods provides a suitable solution for landslide evaluation. Availability of geotechnical and geophysical data makes it possible to investigate correlation between different parameters. Correlating geotechnical and geophysical parameters ends up lowering field investigation costs and enhancing subsurface survey speed in a landslide zone. In the present study, in order to evaluate Nargeschal landslide in Iran, ambient noise measurement, ERT survey, and geotechnical investigations were used. Once finished with data processing, the data obtained from geotechnical and geophysical investigations were correlated. These included SPT-N – electrical resistivity, soil moisture content – electrical resistivity, and SPT-N – shear wave velocity correlations. The correlations were examined using two methods, namely Spearman’s coefficient test and least square regression analysis. The results obtained from the two methods were in good agreement with one another. The correlations obtained in this study were of moderate to very strong strength and fell in the range of the results of previous studies. Investigation of the results indicated significant influences of ground water on electrical resistivity and soil stiffness on shear wave velocity. Results of this study can be used for soil classification and determination of mechanical and seismic characteristics of soil across various areas.

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