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Acknowledgments

Several careful reviews by the Editor of the new Manual of Observatory Practice, Peter Bormann, and suggestions by Axel Plesinger and Jens Havskov have significantly improved the clarity and completeness of this text. A more concise version of this text with some advanced topics added has been submitted for publication in the IASPEI Handbook of Earthquake and Engineering seismology.

Erhard Wielandt
2002-11-08