A new Bouguer gravity map of Austria

Autor(en)

Bruno Meurers, Diethard Ruess

Abstrakt

All gravity data acquired in Austria during the past 50 years by different institutions have been reprocessed and homogenized in

order to compile a new and accurate Bouguer gravity map of the Eastern Alps. Reprocessing was based on modern methods of

terrain correction procedures and a digital terrain model (DTM) with 50 m spacing in order to get accurate corrections even in rough

and mountainous areas. The DTM and digital cadastre also helped correcting the station coordinates that had been extracted from

topographic maps in some of the early surveys. The final data set consists of 54000 stations with an average station distance of

less than 3 km, even in the mountains. Commonly, the Bouguer gravity is based on orthometric rather than on ellipsoidal heights.

Based on the newest geoid models, the Bouguer anomaly for the new map was determined using ellipsoidal heights, and the geophysical

indirect effect was estimated. Additionally, mass corrections were determined by applying a 2D density model in order to

investigate the errors introduced by assuming constant density in the standard processing. Finally, a stripped gravity map was derived

to enhance the effect of sources within the upper crust. The new homogenized gravity data set refers to the absolute gravity

datum and provides a much improved base for present and future Austrian Geoid solutions in Austria and neighbouring countries.

This paper covers collection and processing of gravity data in Austria and presents a new Bouguer gravity map. Results of geological

interpretation will be subject of future papers.

Organisation(en)

Institut für Meteorologie und Geophysik

Externe Organisation(en)

BEV - Bundesamt für Eich- und Vermessungswesen

Journal

Austrian Journal of Earth Sciences

Band

102

Seiten

62-70

Anzahl der Seiten

9

ISSN

0251-7493

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

105102 Allgemeine Geophysik

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