X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Reply by the author to William C. Pearson
    Society of Exploration Geophysicists ; 1984
    In:  GEOPHYSICS Vol. 49, No. 4 ( 1984-04), p. 477-477
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 49, No. 4 ( 1984-04), p. 477-477
    Abstract: Mr. Pearson’s Discussion was received after answers by the author had been submitted to prior Discussions by Steenland and Herring. The essential criticisms of all three writers stem from two significant errors in the paper under discussion, namely (1) overstatement of the precision and resolving power of the Carson airborne gravity method based mainly on the 1981 test survey; (2) inadvertent errors in the dimensions of some of the data on Figure 8. An early attempt to publish a correction for item (1) (Hammer, 1982) has been delayed and is not yet in print. A revised Figure 8, redrawn to proper scale, is included as Figure 1 above in the Reply to Herring’s Discussion. Public criticism for my errors in this definitive paper on airborne gravity is useful.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1486938
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1984
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 2
    Online Resource
    Online Resource
    GRAVIMETER PROSPECTING FOR CHROMITE IN CUBA
    Society of Exploration Geophysicists ; 1945
    In:  GEOPHYSICS Vol. 10, No. 1 ( 1945-01), p. 34-49
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 10, No. 1 ( 1945-01), p. 34-49
    Abstract: As a contribution to the War Production Board’s program of exploration for strategic minerals and under an arrangement with the Bethlehem Steel Company, Gulf Research & Development Company, in early 1942, made gravimeter surveys in the chromite bearing Camaguey District, Cuba. One large chromite deposit, under and between two adjacent gravity anomalies, which has been outlined to date by core drilling based on the results of this work, constitutes a substantial addition to the chrome ore reserves of the district. Chrome ore bodies occur in or are associated with igneous rocks. Extensive density determinations of selected rock samples revealed that the chrome ore has a positive density contrast of about 1.5 with respect to the serpentine rock in which it occurs, but also that local occurrences of various other types of igneous rocks, as well as weathered surface material, cause appreciable density contrasts. The technical aspects of the gravimeter field work are discussed. Many gravity anomalies were found; subsequent geological field work and a systematic program of test drilling proves the anomalies to arise from a variety of causes. Typical examples of gravity anomalies due to chromite deposits and to various igneous rock masses are presented. The paper concludes with brief comments on the economic significance of the work.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1437146
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1945
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 3
    Online Resource
    Online Resource
    GRATICULE SPACING VERSUS DEPTH DISCRIMINATION IN GRAVITY INTERPRETATION
    Society of Exploration Geophysicists ; 1977
    In:  GEOPHYSICS Vol. 42, No. 1 ( 1977-02), p. 60-65
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 42, No. 1 ( 1977-02), p. 60-65
    Abstract: Very serious distortions in both magnitude and extension of local gravity anomalies result from the still widely used 9-point “residual” and 17-point “second derivative” graticules. Although these types of residual maps are very useful for recognizing and pinpointing the existence of interesting local anomalies, the distorted results cannot be used to derive geologic interpretations of significant reliability. A practical procedure based on changes in anomaly magnitudes from two (or more) different grid spacings, effectively overcomes shortcomings of previous interpretation methods.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1440714
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1977
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 4
    Online Resource
    Online Resource
    Reply by the author to F. Bryan Davies
    Society of Exploration Geophysicists ; 1986
    In:  GEOPHYSICS Vol. 51, No. 7 ( 1986-07), p. 1503-1503
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 51, No. 7 ( 1986-07), p. 1503-1503
    Abstract: Dr. Davies introduces signal‐processing theory into the argument. Although its pertinence to this discussion is quite marginal, it appears to be an interesting topic for a technical paper for publication in Geophysics. Other points by Davies call for my strong dissent.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1486952
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1986
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 5
    Online Resource
    Online Resource
    DENSITY DETERMINATIONS BY UNDERGROUND GRAVITY MEASUREMENTS—SEQUEL
    Society of Exploration Geophysicists ; 1965
    In:  GEOPHYSICS Vol. 30, No. 6 ( 1965-12), p. 1133-1134
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 30, No. 6 ( 1965-12), p. 1133-1134
    Abstract: The foregoing paper (McCulloh, 1965) reports an exhaustive study and extension of a previous investigation bearing the captioned title (Hammer, 1950) of the problem of determining rock densities in the crust of the earth. Hammer reported that laboratory measurements on core samples gave densities which were systematically about 5 percent lower than the values determined by underground gravity measurements in 1945 in the vertical shaft of the Pittsburgh Plate Glass Company limestone mine at Barberton, Ohio. After considering the various factors which might affect the gravity determinations, Hammer concluded that the systematic difference was to be ascribed to nonrepresentative cores and core measurements. McCulloh suggests and adduces convincing evidence that the discrepancy was, in fact, due to an unrecognized gross error of about 12 percent in the gravimeter calibration.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1439698
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1965
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 6
    Online Resource
    Online Resource
    Critique of terrain corrections for gravity stations
    Society of Exploration Geophysicists ; 1982
    In:  GEOPHYSICS Vol. 47, No. 5 ( 1982-05), p. 839-840
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 47, No. 5 ( 1982-05), p. 839-840
    Abstract: The terrain correction problem for gravity stations continues to attract perennial interest. Since the publication of Hayford and Bowie’s method (1912) and Hammer’s detailed tables (1939), no fewer than 35 papers have reported changes and improvements (in various languages, including Russian) the latest by Olivier and Simard (1981) in a recent issue of Geophysics. However, in none of these papers is there explicit discussion of the weighting for topography within the radial distance across a topographic compartment. This is not a negligible factor, especially for inner topographic zones.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1441352
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1982
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 7
    Online Resource
    Online Resource
    EXPLORING FOR STRATIGRAPHIC TRAPS WITH GRAVITY GRADIENTS
    Society of Exploration Geophysicists ; 1975
    In:  GEOPHYSICS Vol. 40, No. 2 ( 1975-04), p. 256-268
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 40, No. 2 ( 1975-04), p. 256-268
    Abstract: The vast and growing literature on the search for stratigraphic traps for petroleum ignores gravity gradients, for which the theory has been available since the heyday of the Eötvös torsion balance decades ago. These are discussed in this paper. The horizontal and vertical gradients can be measured with available gravimeters and (to a limited extent) with the Eötvös torsion balance. A major advantage of the gradient method is that surveying to determine position and elevation of the station is not required. Both theory and practice have been reported in the geophysical literature, but the important application to stratigraphic traps has not been mentioned. We evaluate here the method for locating “pinchouts”, a term which embraces “stratigraphic” and “unconformity” traps in Halbouty’s (1972) classification. Both position and depth of the assumed pinchout are determined by the gradient anomaly. The magnitudes of anomalies of horizontal and vertical gradients are about equal. However, pending new instrumentation, only the horizontal gradient is practically useful for field surveys. The gradient method is quantitatively promising and, used in conjunction with other methods, should significantly advance the search for stratigraphic traps for petroleum.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1440523
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1975
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 8
    Online Resource
    Online Resource
    A note on airborne gravity terrain corrections
    Society of Exploration Geophysicists ; 1983
    In:  GEOPHYSICS Vol. 48, No. 3 ( 1983-03), p. 396-399
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 48, No. 3 ( 1983-03), p. 396-399
    Abstract: Terrain corrections for airborne gravity surveying have been a cause of some concern in the exploration industry (Hammer, 1974). Some skepticism still persists that the problem may be troublesome. As a matter of fact, an essential feature of the present field procedure in airborne gravity surveying is to make observations in a more or less square array of intersecting lines, along which narrow beam radar recordings of the terrain clearance provide topographic information to calculate the terrain corrections (Navazio and Gumert, 1981). In addition, this yields a topographic contour map of the area which is very useful for many other purposes. What has not been generally appreciated is that taking observations in the air, at some distance above the topography, actually is a major advantage with respect to the terrain corrections. The magnitude and general behavior of the terrain correction problem in airborne gravity is demonstrated herein by very simple simulated calculations.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1441478
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1983
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 9
    Online Resource
    Online Resource
    GEOPHYSICAL ACTIVITY IN 1954
    Society of Exploration Geophysicists ; 1955
    In:  GEOPHYSICS Vol. 20, No. 3 ( 1955-07), p. 654-670
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 20, No. 3 ( 1955-07), p. 654-670
    Abstract: Geophysical activity in explorations for petroleum on a global scale in 1954 was 6.3% lower than the record high of 1953. Notable increases in geophysical effort in Europe, the Middle East, and the Far East were not sufficient to overcome the very substantial decreases in the United States and Canada. The reduction occurred mainly in seismic operations, which decreased globally by 8.4%. Gravity activity was on the increase almost everywhere with the world‐wide rise of 7.1%. Magnetic and miscellaneous other geophysical methods also showed moderate increases in the neighborhood of one percent.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1438171
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1955
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 10
    Online Resource
    Online Resource
    Airborne gravity is here!
    Society of Exploration Geophysicists ; 1983
    In:  GEOPHYSICS Vol. 48, No. 2 ( 1983-02), p. 213-223
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 48, No. 2 ( 1983-02), p. 213-223
    Abstract: The achievement of practical and useful airborne gravity exploration for petroleum is a major culmination of more than twenty years of research and development. Commercial surveys have now been conducted for three years. The precision and anomaly resolution attainable are twice as good as that of current shipborne gravity data. This paper presents data to demonstrate the precision of airborne gravity and discusses its usefulness (with simultaneous magnetics and topography). Industrial acceptance of the method portends a new era in geophysical exploration for oil and gas which gives promise to double the effectiveness of explorations on land in both time and cost.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1441460
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1983
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
Nothing or not found what you are looking for? Please check your search query or use the Interlibrary Loan Search.
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages