Gravity expeditions at sea 1923-1938. Vol. IV
Complete results with isostatic reduction, interpretation on the results
Nederlandse Commissie voor Geodesie 9,
Delft, 1948. 233 pages.
ISBN-13: 978 90 6132 015 9. ISBN-10: 90 6132 015 1. € 27.00
This publication contains a list of the complete results of the
gravity expeditions at sea of the Netherlands Geodetic Commission up to
the year 1938, i.e. of 844 stations, isostatically reduced according to
the Hayford-Bowie reduction and to the Airy reduction for local
compensation and for five degrees of regionality of the compensation,
for crustal thicknesses T of 20 km and of 30 km.
It further contains an attempt at an interpretation of these results. Chapter II gives a discussion of the gravity results in the Indonesian Archipelago in connection with other geophysical problems as those of the development of folded mountain-ranges and of the sinking of deep basins in these areas. Readers not familiar with mathematical formulas may prefer to skip 5 of this chapter for a first reading: § 6 contains a summary of its results.
In Chapter III the results over and near volcanic islands are dealt with and
in Chapter IV those over the continental margins and over some oceanic
features as the Romanche Deep, the Bromley Plateau, the Walvis Ridge and the
Madagascar Ridge. Chapter V discusses the results obtained in the North
Atlantic and in the profiles observed in the South Atlantic, the Indian
Ocean and the Pacific. A short discussion of the meaning of wide-spread
anomaly-fields closes this chapter.
A more detailed summary is found in chapter I, § 1.
Short Summary 5
I. The isostatic Reduction of the Gravity Results 7
II. The Indonesian Archipelago 25
III. Volcanic Islands 91
IV. Gravity over the Continental Margins and over the Romanche Trough, the Bromley Plateau, the Walvis Ridge, the Madagascar Ridge, etc. 109
V. Gravity over the Oceans 133
Table of complete Results after isostatic reduction (indirect isostatic reduction included).
Plates I - VI Gravity- and Depth-profiles
Maps of the East Indies and the North Atlantic