Vening Meinesz inverse isostatic problem with local and global Bouguer anomalies |
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| Authors: | H Abd-Elmotaal |
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| Institution: | (1) Civil Engineering Department, Faculty of Engineering, Minia University, Minia 61111, Egypt e-mail: hamotaal@frcu.eun.eg; Tel.: +20 2 2591541; Fax: +20 2 2918059, EG |
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| Abstract: | Inverse problems in isostasy will consist in making the isostatic anomalies to be zero under a certain isostatic hypothesis.
In the case of the Vening Meinesz isostatic hypothesis, the density contrast is constant, while the Moho depth (depth of the
Mohorovičić discontinuity) is variable. Hence, the Vening Meinesz inverse isostatic problem aims to determine a suitable variable
Moho depth for a prescribed constant density contrast. The main idea is easy but the theoretical analysis is somewhat difficult.
Moreover, the practical determination of the variable Moho depths based on the Vening Meinesz inverse problem is a laborious
and time-consuming task. The formulas used for computing the inverse Vening Meinesz Moho depths are derived. The computational
tricks essentially needed for computing the inverse Vening Meinesz Moho depths from a set of local and global Bouguer anomalies
are described. The Moho depths for a test area are computed based on the inverse Vening Meinesz isostatic problem. These Moho
depths fit the Moho depths derived from seismic observations with a good accuracy, in which the parameters used for the fitting
agree well with those determined geophysically.
Received: 4 February 1999 / Accepted: 4 October 1999 |
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| Keywords: | : Isostasy Vening Meinesz Inverse problems Mohorovič ić discontinuity |
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