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 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 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.

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.

Nutrient supplementation among pregnant women in China: an observational study

2021 ◽  
pp. 1-19
Author(s):  
Tao Han ◽  
Jingwen Dong ◽  
Jiangtao Zhang ◽  
Chenxiao Zhang ◽  
Yuxuan Wang ◽  
...  
Keyword(s):  
Vitamin D ◽  
Folic Acid ◽  
Pregnant Women ◽  
Family Members ◽  
Primary Source ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Nutrient Supplementation ◽  
Face To Face ◽  
Source Of Information

Abstract Objective: To clarify nutrient supplementation usage and primary source of information among pregnant women in China. Design: This cross-sectional study used information on nutrient supplementation and primary source of information collected via face-to-face interviews. Data on the usage of folic acid, calcium/vitamin D, iron, vitamins, docosahexaenoic acid, and other dietary supplements were collected. Primary source of information were categorized as family/relatives, friends/co-workers, the Internet, books/magazines, television/radio, doctors, other people, and oneself. Setting: Maternal and Child Health Hospital in Chengdu, China. Participants: 1081 Chinese pregnant women aged ≥ 20 years with singleton pregnancies. Results: In all three trimesters of pregnancy, usage was highest and most stable for folic acid (81.7%), followed by vitamins (vitamin A, B-group vitamins, vitamin C, and multivitamins; 75.0%), whereas calcium/vitamin D (51.4%) and iron (18.1%) usage was low, potentially indicating a deficiency risk. All supplementation usage percentages increased with pregnancy duration (p < 0.05). Notably, approximately 10% of the pregnant women in our study did not use any nutrient supplementation, and this was especially common in early pregnancy. More than 50% of the women reported getting information on nutrient supplementation from family members, and about 30% reported getting this information from doctors. Conclusions: Among pregnant women in China, awareness about nutrient supplementation increases as the pregnancy progresses, but some types of nutrient supplementation (such as calcium/vitamin D and iron) remain at low levels. It is necessary to pay more attention to the health education of pregnant women in China, and the influence of family members should be emphasized.

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.

Assessment and Modeling of Groundwater Potential Zones by using Geospatial and Decision-making approaches: A case study in Anantapur district, Andhra Pradesh, India

2021 ◽  
Vol 5 (1) ◽  
pp. 34-44
Author(s):  
B. Pradeep Kumar ◽  
K. Raghu Babu ◽  
M. Rajasekhar ◽  
M. Ramachandra
Keyword(s):  
Andhra Pradesh ◽  
Primary Source ◽  
Drainage Density ◽  
Groundwater Potential ◽  
Groundwater Exploration ◽  
Groundwater Potential Zone ◽  
Potential Zone ◽  
Groundwater Potential Zones ◽  
Thematic Layers ◽  
Total Study Area

Freshwater scarcity is a major issue in Rayalaseema region in Andhra Pradesh (India). Groundwater is the primary source of drinking and irrigation water in Anantapur district, Andhra Pradesh, India. Therefore, it is important to identify areas having groundwater potential; however, the current methods of groundwater exploration consume a lot of time and money. Analytic Hierarchy Process (AHP)-based spatial model is used to identify groundwater potential zones in Anantapur using remote sensing and GIS-based decision support system. Thematic layers considered in this study were geology, geomorphology, soils, land use land cover (LULC), lineament density (LD), drainage density (DD), slope, and rainfall. According to Saaty’s AHP, all these themes and individual features were weighted according to their relative importance in groundwater occurrence. Thematic layers were finally combined using ArcGIS to prepare a groundwater potential zone map. The high weighted value area was considered a groundwater prospecting region. Accordingly, the GWPZ map was classified into four categories: very good, good, moderate, and poor. The very good GWPZ area is 77.37 km2 (24.93%) of the total study area. The northeastern and southeastern sections of the study area, as well as some medium patches in the center and western regions, are covered by moderate GWPZs, which cover an area of 53.07 km2 (17.10%). However, the GWP in the study area’s central, southwestern, and northern portions is poor, encompassing an area of approximately 79.31 km2 (25.56%). Finally, RS and GIS techniques are highly effective and useful for identifying GWPZs.

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