A Moho Model for Africa

Document Type : Original Article

Authors

1 Civil Engineering Dep., Faculty of Engineering, Minia University, Minia, Egypt

2 Geodetic Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany

3 Institute of Geodesy, Graz University of Technology, Graz, Austria

Abstract

The Mohorovičić´ discontinuity (Moho depth) is important information regarding the Earth’s interior. It is used in several applications in geodesy and geophysics. Recent advances in Moho models, which integrate seismic, gravity, and satellite data, provide new opportunities for several geodetic and geophysical applications, e.g., enhancing the geoid determination accuracy, understanding regional geodynamics and plate motion, as well as studying the tectonic motion and earthquake monitoring. Several Moho models were tested, ultimately leading to the creation of a composite model for Africa. This model was derived using least-squares interpolation technique. In order to perform the least-squares interpolation technique, a trend surface has been removed from all source Moho data to satisfy the necessarily condition of having centered interpolated field, i.e., a field with zero mean. A smart approach for fitting the covariance function has been implemented. The removed trend surface has been restored after the interpolation process yielding the 3′ × 3′ AFRMoho25 Moho model for Africa.

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