Journal of Environmental & Engineering Geophysics I December 2002 Volume 7 Issue 4 Contents Instructions to Authors I iii J. C. Wynn Mapping an Iron-Meteorite Impact Site with a Magnetometer, and Implications for the Probability of a Catastrophic Impact on Earth 143 I E. B. Davies, E. J. Mercado, M. W O'Neill and J. A. McDonald Studies of a Riverbed Scour Monitor System Using a Pier-Interior Cased Borehole I 151 Edward W Woolery SH-Wave Seismic Reflection Images of Anomalous Foundation Conditions at the Missis1sinewa Dam, Indiana 161 Bernhard Siemon, ChristJne Stuntebeck, Klaus-Peter Sengpiel, I Bernd Rattger, Hans-Joachim Rehli and Detter G. Eberle Investigation of HazardcJus Waste Sites and their Environment Using the BGR Helicopter-Borne Geophysical System 169 Author Biographies 182