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SEISMOLOGISCHES ZENTRALOBSERVATORIUM, KRANKENHAUSSTRASSE 1, 8520 ERLANGEN West Germany
Abstract
Broadband seismograms, recorded at the Graefenberg (GRF) Array in Germany are analyzed. These data from the Chile-Peru area have often a very complicated signature. We have attempted to identify pP using theoretical seismograms. A third phase besides P and pP, which may have higher frequencies, was discovered in a number of broadband records. Interpretations that relate this phase to the source or the structure are discussed. Our preferred interpretation is an S to P conversion at the bottom of the descending plate.
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