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New Bouguer gravity maps of Venezuela; representation and analysis of free-air and Bouguer anomalies with emphasis on spectral analyses and elastic thickness

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doi: 10.1155/2012/731545
Authors:Sanchez-Rojas, Javier
Author Affiliations:Primary:
Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften Abteilung Geophysik, Kiel, Germany
Volume Title:International Journal of Geophysics
Source:International Journal of Geophysics, Vol.2012. Publisher: Hindawi, London, International. ISSN: 1687-885X
Publication Date:2012
Note:In English. 58 refs.; illus., incl. sketch maps
Summary:A new gravity data compilation for Venezuela was processed and homogenized. Gravity was measured in reference to the International Gravity Standardization Net 1971, and the complete Bouguer anomaly was calculated by using the Geodetic Reference System 1980 and 2.67 Mg/m3. A regional gravity map was computed by removing wavelengths higher than 200 km from the Bouguer anomaly. After the anomaly separation, regional and residual Bouguer gravity fields were then critically discussed in term of the regional tectonic features. Results were compared with the previous geological and tectonic information obtained from former studies. Gravity and topography data in the spectral domain were used to examine the elastic thickness and depths of the structures of the causative measured anomaly. According to the power spectrum analysis results of the gravity data, the averaged Moho depths for the massif, plains, and mountainous areas in Venezuela are 42, 35, and 40 km, respectively. The averaged admittance function computed from the topography and Free-Air anomaly profiles across Merida Andes showed a good fit for a regional compensation model with an effective elastic thickness of 15 km.
Subjects:Bouguer anomalies; Free-air anomalies; Geophysical methods; Global navigation satellite systems; Global Positioning System; Gravity anomalies; Gravity field; Gravity methods; Mohorovicic discontinuity; Receiver functions; Spectral analysis; Tectonics; Andes; Merida Venezuela; South America; Venezuela
Coordinates:N060000 N110000 W0680000 W0730000
N060000 N110000 W0640000 W0690000
Record ID:812953-46
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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