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We discuss the role that extended structure of the ICRF2 defin ing sources may play in the accuracy of the determination of geodetic parameters. At the moment, there is no adequate way to take it into account on practice. We suggest a massive study of multi frequency behavior of the ICRF2 defining sources in order to determine signs of an approachin g state of activity. In the near future this study will help to optimize the GeoVLBI scheduling proc ess. We present a preliminary case study of a source 0133+476. We found that the accuracy of the E OP determination is likely to be influenced by variability in the inner jet of the source rat her than the large-scale extended emission.

Alert system for the VLBI database of ICRF2 sources. Preparatory case study.