Kinematics of the Ibero-Moroccan segment of the Eurasia-Nubia plate boundary derived from GEODAC solutions Abstract

abstract

  • GEODAC (GEO-Database and Analysis Center) is a new research service being implemented in the framework of the IAG Inter-Commission Project P3.2 (WEGENER Project). It is intended to support geodynamic studies along the Eurasia-Nubia plate boundary by collecting and providing geo-data and derived solutions to the entire scientific community, having a special focus on promoting the collaboration with researchers from developing countries. For the initial phase of implementation of this service, the Ibero-Moroccan segment of the Eurasia-Nubia plate boundary was selected. The observations of all available continuously-operating GPS sites in the Iberian Peninsula and Morocco are being processed on a daily basis in order to estimate and discriminate geophysical and other signals present in their time-series. The magnitude of several loading effects and the proper evaluation of the uncertainties associated with the estimated motions are major research issues at GEODAC. The analysis of the derived secular motions for the Ibero-Moroccan region confirms previous observations that most of Iberia forms a stable block fixed relative to Eurasia. The stations along the southern coast of Spain and the northern coast of Morocco show a distinctive behavior, with larger and more westward velocities. For the westernmost stations, the observed motions are larger than the predicted by geophysical and geodetic plate tectonic models for the Nubia-Eurasia plate convergence. We assume that the observed increasing motion is due to the interaction of this plate convergence with “local” lithospheric processes. Interdisciplinary studies are underway to analyze these local processes, namely by integrate different geodetic techniques (including InSAR) with geological and geophysical data.

authors

publication date

  • 2006

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