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Erhard Wielandt
Institute of Geophysics, University of Stuttgart
Richard-Wagner-Strasse 44, D - 70184 Stuttgart

The original text was submitted as a contribution to the IASPEI
International Handbook of Earthquake and Engineering Seismology
edited by W. H. K. Lee, H. Kanamori and P. C. Jennings
This version has been slightly updated.

A postscript version can be downloaded


Erhard Wielandt