UCRL-JC-134307 PREPRINT Applying Coda Envelope Measurements to Local and Regional Waveforms For Stable Estimates of Magnitude, Source Spectra, & Energy K. Mayeda R. Hofstetter A. Rodgers W. Walter This paper was prepared for submittal to the 2 1 st Seismic Research Symposium: Technologies for Monitoring the Comprehensive Nuclear-Test-Ban Treaty Las Vegas, Nevada September 21-24, 1999 July 26,1999 This is a preprint of a paper intended for publication in a journal or proceedings. ^. . ..* . . . . . . . . the understanding that it will not be cited or reproduced without the permission of the