GL-TR-90-0301 ENVIRONMENTAL RESEARCH PAPERS, NO. 1070 AD-A229 228 Proceedings of the 11th Annual DARPA/AFGL Seismic .. Research Symposium, 2-4 May 1989 tilt fILt Editors: JAMES F. LEWKOWICZ JFANNE M. McPHETRES 0141990 6 November 1990 Approved for public release; di stri bution unlimied. EARTH SCIENCES DIVISION PROJECT 7600 GEOPHYSICS LABORATORY HANSCOM AFB, MA 01731-5000 90 1 3 04