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A number of the largest earthquakes from the Swabian Alb recorded at the Grafenberg array have been examined (the geographic coordinates of the main station GRF are 49.69°N and 11.22°E; see Harjes and Seidl (1978) for a description of the array). It has been shown that the GRF records of some of the largest Swabian Alb earthquakes have a clear additional arrival between Pn and Pg.
Harjes, H.-P., Seidl, D. (1978) Digital recording and analysis of broad-band seismic data at the Grafenberg (GRF)-array. J. Geophys. 44, 511-523
Kind, R. (1978) The reflectivity method for a hurried source. J. Geophys. 44, 603-612
Kind, R. (1979) Extensions of the reflectivity method. J. Geophys. 45 (In press)